* [PATCH v1 0/5] Tegra114: implement EMC support
@ 2026-01-26 19:07 Svyatoslav Ryhel
2026-01-26 19:07 ` [PATCH v1 1/5] dt-bindings: memory: Document Tegra114 Memory Controller Svyatoslav Ryhel
` (4 more replies)
0 siblings, 5 replies; 18+ messages in thread
From: Svyatoslav Ryhel @ 2026-01-26 19:07 UTC (permalink / raw)
To: Krzysztof Kozlowski, Rob Herring, Conor Dooley, Thierry Reding,
Jonathan Hunter, Mikko Perttunen, Svyatoslav Ryhel, Sumit Gupta,
Dmitry Osipenko
Cc: linux-kernel, devicetree, linux-tegra
Add support for External Memory Controller found in Tegra 4 SoC along
with adjustments required for it to work properly.
Tested on ASUS TF701T (T40X) and Nvidia Tegratab (T40S). Both work fine.
Part of previous patchset: https://lore.kernel.org/lkml/20251125120559.158860-1-clamor95@gmail.com/
Svyatoslav Ryhel (5):
dt-bindings: memory: Document Tegra114 Memory Controller
memory: tegra: implement EMEM regs and ICC ops for Tegra114
dt-bindings: memory: Add Tegra114 memory client IDs
dt-bindings: memory: Document Tegra114 External Memory Controller
memory: tegra: Add Tegra114 EMC driver
.../nvidia,tegra124-emc.yaml | 174 +-
.../nvidia,tegra124-mc.yaml | 31 +-
drivers/memory/tegra/Kconfig | 12 +
drivers/memory/tegra/Makefile | 1 +
drivers/memory/tegra/tegra114-emc.c | 1463 +++++++++++++++++
drivers/memory/tegra/tegra114.c | 193 +++
include/dt-bindings/memory/tegra114-mc.h | 67 +
7 files changed, 1770 insertions(+), 171 deletions(-)
create mode 100644 drivers/memory/tegra/tegra114-emc.c
--
2.51.0
^ permalink raw reply [flat|nested] 18+ messages in thread
* [PATCH v1 1/5] dt-bindings: memory: Document Tegra114 Memory Controller
2026-01-26 19:07 [PATCH v1 0/5] Tegra114: implement EMC support Svyatoslav Ryhel
@ 2026-01-26 19:07 ` Svyatoslav Ryhel
2026-01-26 19:07 ` [PATCH v1 2/5] memory: tegra: implement EMEM regs and ICC ops for Tegra114 Svyatoslav Ryhel
` (3 subsequent siblings)
4 siblings, 0 replies; 18+ messages in thread
From: Svyatoslav Ryhel @ 2026-01-26 19:07 UTC (permalink / raw)
To: Krzysztof Kozlowski, Rob Herring, Conor Dooley, Thierry Reding,
Jonathan Hunter, Mikko Perttunen, Svyatoslav Ryhel, Sumit Gupta,
Dmitry Osipenko
Cc: linux-kernel, devicetree, linux-tegra
Add Tegra114 support into existing Tegra124 MC schema with the most
notable difference in the amount of EMEM timings.
Signed-off-by: Svyatoslav Ryhel <clamor95@gmail.com>
Reviewed-by: Rob Herring (Arm) <robh@kernel.org>
---
.../nvidia,tegra124-mc.yaml | 31 +++++--------------
1 file changed, 8 insertions(+), 23 deletions(-)
diff --git a/Documentation/devicetree/bindings/memory-controllers/nvidia,tegra124-mc.yaml b/Documentation/devicetree/bindings/memory-controllers/nvidia,tegra124-mc.yaml
index 7b18b4d11e0a..f8747cebb680 100644
--- a/Documentation/devicetree/bindings/memory-controllers/nvidia,tegra124-mc.yaml
+++ b/Documentation/devicetree/bindings/memory-controllers/nvidia,tegra124-mc.yaml
@@ -19,7 +19,9 @@ description: |
properties:
compatible:
- const: nvidia,tegra124-mc
+ enum:
+ - nvidia,tegra114-mc
+ - nvidia,tegra124-mc
reg:
maxItems: 1
@@ -64,29 +66,12 @@ patternProperties:
nvidia,emem-configuration:
$ref: /schemas/types.yaml#/definitions/uint32-array
- description: |
+ description:
Values to be written to the EMEM register block. See section
- "15.6.1 MC Registers" in the TRM.
- items:
- - description: MC_EMEM_ARB_CFG
- - description: MC_EMEM_ARB_OUTSTANDING_REQ
- - description: MC_EMEM_ARB_TIMING_RCD
- - description: MC_EMEM_ARB_TIMING_RP
- - description: MC_EMEM_ARB_TIMING_RC
- - description: MC_EMEM_ARB_TIMING_RAS
- - description: MC_EMEM_ARB_TIMING_FAW
- - description: MC_EMEM_ARB_TIMING_RRD
- - description: MC_EMEM_ARB_TIMING_RAP2PRE
- - description: MC_EMEM_ARB_TIMING_WAP2PRE
- - description: MC_EMEM_ARB_TIMING_R2R
- - description: MC_EMEM_ARB_TIMING_W2W
- - description: MC_EMEM_ARB_TIMING_R2W
- - description: MC_EMEM_ARB_TIMING_W2R
- - description: MC_EMEM_ARB_DA_TURNS
- - description: MC_EMEM_ARB_DA_COVERS
- - description: MC_EMEM_ARB_MISC0
- - description: MC_EMEM_ARB_MISC1
- - description: MC_EMEM_ARB_RING1_THROTTLE
+ "20.11.1 MC Registers" in the Tegea114 TRM or
+ "15.6.1 MC Registers" in the Tegra124 TRM.
+ minItems: 18
+ maxItems: 19
required:
- clock-frequency
--
2.51.0
^ permalink raw reply related [flat|nested] 18+ messages in thread
* [PATCH v1 2/5] memory: tegra: implement EMEM regs and ICC ops for Tegra114
2026-01-26 19:07 [PATCH v1 0/5] Tegra114: implement EMC support Svyatoslav Ryhel
2026-01-26 19:07 ` [PATCH v1 1/5] dt-bindings: memory: Document Tegra114 Memory Controller Svyatoslav Ryhel
@ 2026-01-26 19:07 ` Svyatoslav Ryhel
2026-01-26 19:07 ` [PATCH v1 3/5] dt-bindings: memory: Add Tegra114 memory client IDs Svyatoslav Ryhel
` (2 subsequent siblings)
4 siblings, 0 replies; 18+ messages in thread
From: Svyatoslav Ryhel @ 2026-01-26 19:07 UTC (permalink / raw)
To: Krzysztof Kozlowski, Rob Herring, Conor Dooley, Thierry Reding,
Jonathan Hunter, Mikko Perttunen, Svyatoslav Ryhel, Sumit Gupta,
Dmitry Osipenko
Cc: linux-kernel, devicetree, linux-tegra
Prepare Internal Memory Controller for introduction of External Memory
Controller.
Signed-off-by: Svyatoslav Ryhel <clamor95@gmail.com>
Reviewed-by: Mikko Perttunen <mperttunen@nvidia.com>
---
drivers/memory/tegra/tegra114.c | 193 ++++++++++++++++++++++++++++++++
1 file changed, 193 insertions(+)
diff --git a/drivers/memory/tegra/tegra114.c b/drivers/memory/tegra/tegra114.c
index d03a5d162dbd..c615857f7fad 100644
--- a/drivers/memory/tegra/tegra114.c
+++ b/drivers/memory/tegra/tegra114.c
@@ -3,6 +3,7 @@
* Copyright (C) 2014 NVIDIA CORPORATION. All rights reserved.
*/
+#include <linux/device.h>
#include <linux/of.h>
#include <linux/mm.h>
@@ -1165,6 +1166,195 @@ static const struct tegra_mc_reset tegra114_mc_resets[] = {
TEGRA114_MC_RESET(VI, 0x200, 0x204, 17),
};
+static void tegra114_mc_tune_client_latency(struct tegra_mc *mc,
+ const struct tegra_mc_client *client,
+ unsigned int bandwidth_mbytes_sec)
+{
+ u32 arb_tolerance_compensation_nsec, arb_tolerance_compensation_div;
+ unsigned int fifo_size = client->fifo_size;
+ u32 arb_nsec, la_ticks, value;
+
+ /* see 20.3.1.1 Client Configuration in Tegra4 TRM v01p */
+ if (bandwidth_mbytes_sec)
+ arb_nsec = fifo_size * NSEC_PER_USEC / bandwidth_mbytes_sec;
+ else
+ arb_nsec = U32_MAX;
+
+ /*
+ * Latency allowness should be set with consideration for the module's
+ * latency tolerance and internal buffering capabilities.
+ *
+ * Display memory clients use isochronous transfers and have very low
+ * tolerance to a belated transfers. Hence we need to compensate the
+ * memory arbitration imperfection for them in order to prevent FIFO
+ * underflow condition when memory bus is busy.
+ *
+ * VI clients also need a stronger compensation.
+ */
+ switch (client->swgroup) {
+ case TEGRA_SWGROUP_MPCORE:
+ case TEGRA_SWGROUP_PTC:
+ /*
+ * We always want lower latency for these clients, hence
+ * don't touch them.
+ */
+ return;
+
+ case TEGRA_SWGROUP_DC:
+ case TEGRA_SWGROUP_DCB:
+ arb_tolerance_compensation_nsec = 1050;
+ arb_tolerance_compensation_div = 2;
+ break;
+
+ case TEGRA_SWGROUP_VI:
+ arb_tolerance_compensation_nsec = 1050;
+ arb_tolerance_compensation_div = 1;
+ break;
+
+ default:
+ arb_tolerance_compensation_nsec = 150;
+ arb_tolerance_compensation_div = 1;
+ break;
+ }
+
+ if (arb_nsec > arb_tolerance_compensation_nsec)
+ arb_nsec -= arb_tolerance_compensation_nsec;
+ else
+ arb_nsec = 0;
+
+ arb_nsec /= arb_tolerance_compensation_div;
+
+ /*
+ * Latency allowance is a number of ticks a request from a particular
+ * client may wait in the EMEM arbiter before it becomes a high-priority
+ * request.
+ */
+ la_ticks = arb_nsec / mc->tick;
+ la_ticks = min(la_ticks, client->regs.la.mask);
+
+ value = mc_readl(mc, client->regs.la.reg);
+ value &= ~(client->regs.la.mask << client->regs.la.shift);
+ value |= la_ticks << client->regs.la.shift;
+ mc_writel(mc, value, client->regs.la.reg);
+}
+
+static int tegra114_mc_icc_set(struct icc_node *src, struct icc_node *dst)
+{
+ struct tegra_mc *mc = icc_provider_to_tegra_mc(src->provider);
+ const struct tegra_mc_client *client = &mc->soc->clients[src->id];
+ u64 peak_bandwidth = icc_units_to_bps(src->peak_bw);
+
+ /*
+ * Skip pre-initialization that is done by icc_node_add(), which sets
+ * bandwidth to maximum for all clients before drivers are loaded.
+ *
+ * This doesn't make sense for us because we don't have drivers for all
+ * clients and it's okay to keep configuration left from bootloader
+ * during boot, at least for today.
+ */
+ if (src == dst)
+ return 0;
+
+ /* convert bytes/sec to megabytes/sec */
+ do_div(peak_bandwidth, 1000000);
+
+ tegra114_mc_tune_client_latency(mc, client, peak_bandwidth);
+
+ return 0;
+}
+
+static int tegra114_mc_icc_aggreate(struct icc_node *node, u32 tag, u32 avg_bw,
+ u32 peak_bw, u32 *agg_avg, u32 *agg_peak)
+{
+ /*
+ * ISO clients need to reserve extra bandwidth up-front because
+ * there could be high bandwidth pressure during initial filling
+ * of the client's FIFO buffers. Secondly, we need to take into
+ * account impurities of the memory subsystem.
+ */
+ if (tag & TEGRA_MC_ICC_TAG_ISO)
+ peak_bw = tegra_mc_scale_percents(peak_bw, 400);
+
+ *agg_avg += avg_bw;
+ *agg_peak = max(*agg_peak, peak_bw);
+
+ return 0;
+}
+
+static struct icc_node_data *
+tegra114_mc_of_icc_xlate_extended(const struct of_phandle_args *spec, void *data)
+{
+ struct tegra_mc *mc = icc_provider_to_tegra_mc(data);
+ const struct tegra_mc_client *client;
+ unsigned int i, idx = spec->args[0];
+ struct icc_node_data *ndata;
+ struct icc_node *node;
+
+ list_for_each_entry(node, &mc->provider.nodes, node_list) {
+ if (node->id != idx)
+ continue;
+
+ ndata = kzalloc(sizeof(*ndata), GFP_KERNEL);
+ if (!ndata)
+ return ERR_PTR(-ENOMEM);
+
+ client = &mc->soc->clients[idx];
+ ndata->node = node;
+
+ switch (client->swgroup) {
+ case TEGRA_SWGROUP_DC:
+ case TEGRA_SWGROUP_DCB:
+ case TEGRA_SWGROUP_PTC:
+ case TEGRA_SWGROUP_VI:
+ /* these clients are isochronous by default */
+ ndata->tag = TEGRA_MC_ICC_TAG_ISO;
+ break;
+
+ default:
+ ndata->tag = TEGRA_MC_ICC_TAG_DEFAULT;
+ break;
+ }
+
+ return ndata;
+ }
+
+ for (i = 0; i < mc->soc->num_clients; i++) {
+ if (mc->soc->clients[i].id == idx)
+ return ERR_PTR(-EPROBE_DEFER);
+ }
+
+ dev_err(mc->dev, "invalid ICC client ID %u\n", idx);
+
+ return ERR_PTR(-EINVAL);
+}
+
+static const struct tegra_mc_icc_ops tegra114_mc_icc_ops = {
+ .xlate_extended = tegra114_mc_of_icc_xlate_extended,
+ .aggregate = tegra114_mc_icc_aggreate,
+ .set = tegra114_mc_icc_set,
+};
+
+static const unsigned long tegra114_mc_emem_regs[] = {
+ MC_EMEM_ARB_CFG,
+ MC_EMEM_ARB_OUTSTANDING_REQ,
+ MC_EMEM_ARB_TIMING_RCD,
+ MC_EMEM_ARB_TIMING_RP,
+ MC_EMEM_ARB_TIMING_RC,
+ MC_EMEM_ARB_TIMING_RAS,
+ MC_EMEM_ARB_TIMING_FAW,
+ MC_EMEM_ARB_TIMING_RRD,
+ MC_EMEM_ARB_TIMING_RAP2PRE,
+ MC_EMEM_ARB_TIMING_WAP2PRE,
+ MC_EMEM_ARB_TIMING_R2R,
+ MC_EMEM_ARB_TIMING_W2W,
+ MC_EMEM_ARB_TIMING_R2W,
+ MC_EMEM_ARB_TIMING_W2R,
+ MC_EMEM_ARB_DA_TURNS,
+ MC_EMEM_ARB_DA_COVERS,
+ MC_EMEM_ARB_MISC0,
+ MC_EMEM_ARB_RING1_THROTTLE,
+};
+
const struct tegra_mc_soc tegra114_mc_soc = {
.clients = tegra114_mc_clients,
.num_clients = ARRAY_SIZE(tegra114_mc_clients),
@@ -1172,10 +1362,13 @@ const struct tegra_mc_soc tegra114_mc_soc = {
.atom_size = 32,
.client_id_mask = 0x7f,
.smmu = &tegra114_smmu_soc,
+ .emem_regs = tegra114_mc_emem_regs,
+ .num_emem_regs = ARRAY_SIZE(tegra114_mc_emem_regs),
.intmask = MC_INT_INVALID_SMMU_PAGE | MC_INT_SECURITY_VIOLATION |
MC_INT_DECERR_EMEM,
.reset_ops = &tegra_mc_reset_ops_common,
.resets = tegra114_mc_resets,
.num_resets = ARRAY_SIZE(tegra114_mc_resets),
+ .icc_ops = &tegra114_mc_icc_ops,
.ops = &tegra30_mc_ops,
};
--
2.51.0
^ permalink raw reply related [flat|nested] 18+ messages in thread
* [PATCH v1 3/5] dt-bindings: memory: Add Tegra114 memory client IDs
2026-01-26 19:07 [PATCH v1 0/5] Tegra114: implement EMC support Svyatoslav Ryhel
2026-01-26 19:07 ` [PATCH v1 1/5] dt-bindings: memory: Document Tegra114 Memory Controller Svyatoslav Ryhel
2026-01-26 19:07 ` [PATCH v1 2/5] memory: tegra: implement EMEM regs and ICC ops for Tegra114 Svyatoslav Ryhel
@ 2026-01-26 19:07 ` Svyatoslav Ryhel
2026-02-17 7:22 ` Krzysztof Kozlowski
2026-01-26 19:07 ` [PATCH v1 4/5] dt-bindings: memory: Document Tegra114 External Memory Controller Svyatoslav Ryhel
2026-01-26 19:07 ` [PATCH v1 5/5] memory: tegra: Add Tegra114 EMC driver Svyatoslav Ryhel
4 siblings, 1 reply; 18+ messages in thread
From: Svyatoslav Ryhel @ 2026-01-26 19:07 UTC (permalink / raw)
To: Krzysztof Kozlowski, Rob Herring, Conor Dooley, Thierry Reding,
Jonathan Hunter, Mikko Perttunen, Svyatoslav Ryhel, Sumit Gupta,
Dmitry Osipenko
Cc: linux-kernel, devicetree, linux-tegra
Each memory client has unique hardware ID, add these IDs.
Signed-off-by: Svyatoslav Ryhel <clamor95@gmail.com>
Acked-by: Rob Herring (Arm) <robh@kernel.org>
Reviewed-by: Mikko Perttunen <mperttunen@nvidia.com>
---
include/dt-bindings/memory/tegra114-mc.h | 67 ++++++++++++++++++++++++
1 file changed, 67 insertions(+)
diff --git a/include/dt-bindings/memory/tegra114-mc.h b/include/dt-bindings/memory/tegra114-mc.h
index dfe99c8a5ba5..5e0d6a1b91f2 100644
--- a/include/dt-bindings/memory/tegra114-mc.h
+++ b/include/dt-bindings/memory/tegra114-mc.h
@@ -40,4 +40,71 @@
#define TEGRA114_MC_RESET_VDE 14
#define TEGRA114_MC_RESET_VI 15
+#define TEGRA114_MC_PTCR 0
+#define TEGRA114_MC_DISPLAY0A 1
+#define TEGRA114_MC_DISPLAY0AB 2
+#define TEGRA114_MC_DISPLAY0B 3
+#define TEGRA114_MC_DISPLAY0BB 4
+#define TEGRA114_MC_DISPLAY0C 5
+#define TEGRA114_MC_DISPLAY0CB 6
+#define TEGRA114_MC_DISPLAY1B 7
+#define TEGRA114_MC_DISPLAY1BB 8
+#define TEGRA114_MC_EPPUP 9
+#define TEGRA114_MC_G2PR 10
+#define TEGRA114_MC_G2SR 11
+#define TEGRA114_MC_MPEUNIFBR 12
+#define TEGRA114_MC_VIRUV 13
+#define TEGRA114_MC_AFIR 14
+#define TEGRA114_MC_AVPCARM7R 15
+#define TEGRA114_MC_DISPLAYHC 16
+#define TEGRA114_MC_DISPLAYHCB 17
+#define TEGRA114_MC_FDCDRD 18
+#define TEGRA114_MC_FDCDRD2 19
+#define TEGRA114_MC_G2DR 20
+#define TEGRA114_MC_HDAR 21
+#define TEGRA114_MC_HOST1XDMAR 22
+#define TEGRA114_MC_HOST1XR 23
+#define TEGRA114_MC_IDXSRD 24
+#define TEGRA114_MC_IDXSRD2 25
+#define TEGRA114_MC_MPE_IPRED 26
+#define TEGRA114_MC_MPEAMEMRD 27
+#define TEGRA114_MC_MPECSRD 28
+#define TEGRA114_MC_PPCSAHBDMAR 29
+#define TEGRA114_MC_PPCSAHBSLVR 30
+#define TEGRA114_MC_SATAR 31
+#define TEGRA114_MC_TEXSRD 32
+#define TEGRA114_MC_TEXSRD2 33
+#define TEGRA114_MC_VDEBSEVR 34
+#define TEGRA114_MC_VDEMBER 35
+#define TEGRA114_MC_VDEMCER 36
+#define TEGRA114_MC_VDETPER 37
+#define TEGRA114_MC_MPCORELPR 38
+#define TEGRA114_MC_MPCORER 39
+#define TEGRA114_MC_EPPU 40
+#define TEGRA114_MC_EPPV 41
+#define TEGRA114_MC_EPPY 42
+#define TEGRA114_MC_MPEUNIFBW 43
+#define TEGRA114_MC_VIWSB 44
+#define TEGRA114_MC_VIWU 45
+#define TEGRA114_MC_VIWV 46
+#define TEGRA114_MC_VIWY 47
+#define TEGRA114_MC_G2DW 48
+#define TEGRA114_MC_AFIW 49
+#define TEGRA114_MC_AVPCARM7W 50
+#define TEGRA114_MC_FDCDWR 51
+#define TEGRA114_MC_FDCDWR2 52
+#define TEGRA114_MC_HDAW 53
+#define TEGRA114_MC_HOST1XW 54
+#define TEGRA114_MC_ISPW 55
+#define TEGRA114_MC_MPCORELPW 56
+#define TEGRA114_MC_MPCOREW 57
+#define TEGRA114_MC_MPECSWR 58
+#define TEGRA114_MC_PPCSAHBDMAW 59
+#define TEGRA114_MC_PPCSAHBSLVW 60
+#define TEGRA114_MC_SATAW 61
+#define TEGRA114_MC_VDEBSEVW 62
+#define TEGRA114_MC_VDEDBGW 63
+#define TEGRA114_MC_VDEMBEW 64
+#define TEGRA114_MC_VDETPMW 65
+
#endif
--
2.51.0
^ permalink raw reply related [flat|nested] 18+ messages in thread
* [PATCH v1 4/5] dt-bindings: memory: Document Tegra114 External Memory Controller
2026-01-26 19:07 [PATCH v1 0/5] Tegra114: implement EMC support Svyatoslav Ryhel
` (2 preceding siblings ...)
2026-01-26 19:07 ` [PATCH v1 3/5] dt-bindings: memory: Add Tegra114 memory client IDs Svyatoslav Ryhel
@ 2026-01-26 19:07 ` Svyatoslav Ryhel
2026-01-26 19:07 ` [PATCH v1 5/5] memory: tegra: Add Tegra114 EMC driver Svyatoslav Ryhel
4 siblings, 0 replies; 18+ messages in thread
From: Svyatoslav Ryhel @ 2026-01-26 19:07 UTC (permalink / raw)
To: Krzysztof Kozlowski, Rob Herring, Conor Dooley, Thierry Reding,
Jonathan Hunter, Mikko Perttunen, Svyatoslav Ryhel, Sumit Gupta,
Dmitry Osipenko
Cc: linux-kernel, devicetree, linux-tegra
Include Tegra114 support into existing Tegra124 EMC schema with the most
notable difference being the amount of EMC timings and a few SoC unique
entries.
Signed-off-by: Svyatoslav Ryhel <clamor95@gmail.com>
Reviewed-by: Rob Herring (Arm) <robh@kernel.org>
---
.../nvidia,tegra124-emc.yaml | 174 +++---------------
1 file changed, 26 insertions(+), 148 deletions(-)
diff --git a/Documentation/devicetree/bindings/memory-controllers/nvidia,tegra124-emc.yaml b/Documentation/devicetree/bindings/memory-controllers/nvidia,tegra124-emc.yaml
index f5f03bf36413..9398aae49093 100644
--- a/Documentation/devicetree/bindings/memory-controllers/nvidia,tegra124-emc.yaml
+++ b/Documentation/devicetree/bindings/memory-controllers/nvidia,tegra124-emc.yaml
@@ -16,7 +16,9 @@ description: |
properties:
compatible:
- const: nvidia,tegra124-emc
+ enum:
+ - nvidia,tegra114-emc
+ - nvidia,tegra124-emc
reg:
maxItems: 1
@@ -29,6 +31,9 @@ properties:
items:
- const: emc
+ interrupts:
+ maxItems: 1
+
"#interconnect-cells":
const: 0
@@ -164,153 +169,12 @@ patternProperties:
nvidia,emc-configuration:
description:
EMC timing characterization data. These are the registers (see
- section "15.6.2 EMC Registers" in the TRM) whose values need to
+ section "20.11.2 EMC Registers" in the Tegra114 TRM or section
+ "15.6.2 EMC Registers" in the Tegra124 TRM) whose values need to
be specified, according to the board documentation.
$ref: /schemas/types.yaml#/definitions/uint32-array
- items:
- - description: EMC_RC
- - description: EMC_RFC
- - description: EMC_RFC_SLR
- - description: EMC_RAS
- - description: EMC_RP
- - description: EMC_R2W
- - description: EMC_W2R
- - description: EMC_R2P
- - description: EMC_W2P
- - description: EMC_RD_RCD
- - description: EMC_WR_RCD
- - description: EMC_RRD
- - description: EMC_REXT
- - description: EMC_WEXT
- - description: EMC_WDV
- - description: EMC_WDV_MASK
- - description: EMC_QUSE
- - description: EMC_QUSE_WIDTH
- - description: EMC_IBDLY
- - description: EMC_EINPUT
- - description: EMC_EINPUT_DURATION
- - description: EMC_PUTERM_EXTRA
- - description: EMC_PUTERM_WIDTH
- - description: EMC_PUTERM_ADJ
- - description: EMC_CDB_CNTL_1
- - description: EMC_CDB_CNTL_2
- - description: EMC_CDB_CNTL_3
- - description: EMC_QRST
- - description: EMC_QSAFE
- - description: EMC_RDV
- - description: EMC_RDV_MASK
- - description: EMC_REFRESH
- - description: EMC_BURST_REFRESH_NUM
- - description: EMC_PRE_REFRESH_REQ_CNT
- - description: EMC_PDEX2WR
- - description: EMC_PDEX2RD
- - description: EMC_PCHG2PDEN
- - description: EMC_ACT2PDEN
- - description: EMC_AR2PDEN
- - description: EMC_RW2PDEN
- - description: EMC_TXSR
- - description: EMC_TXSRDLL
- - description: EMC_TCKE
- - description: EMC_TCKESR
- - description: EMC_TPD
- - description: EMC_TFAW
- - description: EMC_TRPAB
- - description: EMC_TCLKSTABLE
- - description: EMC_TCLKSTOP
- - description: EMC_TREFBW
- - description: EMC_FBIO_CFG6
- - description: EMC_ODT_WRITE
- - description: EMC_ODT_READ
- - description: EMC_FBIO_CFG5
- - description: EMC_CFG_DIG_DLL
- - description: EMC_CFG_DIG_DLL_PERIOD
- - description: EMC_DLL_XFORM_DQS0
- - description: EMC_DLL_XFORM_DQS1
- - description: EMC_DLL_XFORM_DQS2
- - description: EMC_DLL_XFORM_DQS3
- - description: EMC_DLL_XFORM_DQS4
- - description: EMC_DLL_XFORM_DQS5
- - description: EMC_DLL_XFORM_DQS6
- - description: EMC_DLL_XFORM_DQS7
- - description: EMC_DLL_XFORM_DQS8
- - description: EMC_DLL_XFORM_DQS9
- - description: EMC_DLL_XFORM_DQS10
- - description: EMC_DLL_XFORM_DQS11
- - description: EMC_DLL_XFORM_DQS12
- - description: EMC_DLL_XFORM_DQS13
- - description: EMC_DLL_XFORM_DQS14
- - description: EMC_DLL_XFORM_DQS15
- - description: EMC_DLL_XFORM_QUSE0
- - description: EMC_DLL_XFORM_QUSE1
- - description: EMC_DLL_XFORM_QUSE2
- - description: EMC_DLL_XFORM_QUSE3
- - description: EMC_DLL_XFORM_QUSE4
- - description: EMC_DLL_XFORM_QUSE5
- - description: EMC_DLL_XFORM_QUSE6
- - description: EMC_DLL_XFORM_QUSE7
- - description: EMC_DLL_XFORM_ADDR0
- - description: EMC_DLL_XFORM_ADDR1
- - description: EMC_DLL_XFORM_ADDR2
- - description: EMC_DLL_XFORM_ADDR3
- - description: EMC_DLL_XFORM_ADDR4
- - description: EMC_DLL_XFORM_ADDR5
- - description: EMC_DLL_XFORM_QUSE8
- - description: EMC_DLL_XFORM_QUSE9
- - description: EMC_DLL_XFORM_QUSE10
- - description: EMC_DLL_XFORM_QUSE11
- - description: EMC_DLL_XFORM_QUSE12
- - description: EMC_DLL_XFORM_QUSE13
- - description: EMC_DLL_XFORM_QUSE14
- - description: EMC_DLL_XFORM_QUSE15
- - description: EMC_DLI_TRIM_TXDQS0
- - description: EMC_DLI_TRIM_TXDQS1
- - description: EMC_DLI_TRIM_TXDQS2
- - description: EMC_DLI_TRIM_TXDQS3
- - description: EMC_DLI_TRIM_TXDQS4
- - description: EMC_DLI_TRIM_TXDQS5
- - description: EMC_DLI_TRIM_TXDQS6
- - description: EMC_DLI_TRIM_TXDQS7
- - description: EMC_DLI_TRIM_TXDQS8
- - description: EMC_DLI_TRIM_TXDQS9
- - description: EMC_DLI_TRIM_TXDQS10
- - description: EMC_DLI_TRIM_TXDQS11
- - description: EMC_DLI_TRIM_TXDQS12
- - description: EMC_DLI_TRIM_TXDQS13
- - description: EMC_DLI_TRIM_TXDQS14
- - description: EMC_DLI_TRIM_TXDQS15
- - description: EMC_DLL_XFORM_DQ0
- - description: EMC_DLL_XFORM_DQ1
- - description: EMC_DLL_XFORM_DQ2
- - description: EMC_DLL_XFORM_DQ3
- - description: EMC_DLL_XFORM_DQ4
- - description: EMC_DLL_XFORM_DQ5
- - description: EMC_DLL_XFORM_DQ6
- - description: EMC_DLL_XFORM_DQ7
- - description: EMC_XM2CMDPADCTRL
- - description: EMC_XM2CMDPADCTRL4
- - description: EMC_XM2CMDPADCTRL5
- - description: EMC_XM2DQPADCTRL2
- - description: EMC_XM2DQPADCTRL3
- - description: EMC_XM2CLKPADCTRL
- - description: EMC_XM2CLKPADCTRL2
- - description: EMC_XM2COMPPADCTRL
- - description: EMC_XM2VTTGENPADCTRL
- - description: EMC_XM2VTTGENPADCTRL2
- - description: EMC_XM2VTTGENPADCTRL3
- - description: EMC_XM2DQSPADCTRL3
- - description: EMC_XM2DQSPADCTRL4
- - description: EMC_XM2DQSPADCTRL5
- - description: EMC_XM2DQSPADCTRL6
- - description: EMC_DSR_VTTGEN_DRV
- - description: EMC_TXDSRVTTGEN
- - description: EMC_FBIO_SPARE
- - description: EMC_ZCAL_WAIT_CNT
- - description: EMC_MRS_WAIT_CNT2
- - description: EMC_CTT
- - description: EMC_CTT_DURATION
- - description: EMC_CFG_PIPE
- - description: EMC_DYN_SELF_REF_CONTROL
- - description: EMC_QPOP
+ minItems: 97
+ maxItems: 143
required:
- clock-frequency
@@ -318,9 +182,7 @@ patternProperties:
- nvidia,emc-auto-cal-config2
- nvidia,emc-auto-cal-config3
- nvidia,emc-auto-cal-interval
- - nvidia,emc-bgbias-ctl0
- nvidia,emc-cfg
- - nvidia,emc-cfg-2
- nvidia,emc-ctt-term-ctrl
- nvidia,emc-mode-1
- nvidia,emc-mode-2
@@ -344,6 +206,22 @@ required:
- "#interconnect-cells"
- operating-points-v2
+allOf:
+ - if:
+ properties:
+ compatible:
+ contains:
+ enum:
+ - nvidia,tegra124-emc
+ then:
+ patternProperties:
+ "^emc-timings-[0-9]+$":
+ patternProperties:
+ "^timing-[0-9]+$":
+ required:
+ - nvidia,emc-bgbias-ctl0
+ - nvidia,emc-cfg-2
+
additionalProperties: false
examples:
--
2.51.0
^ permalink raw reply related [flat|nested] 18+ messages in thread
* [PATCH v1 5/5] memory: tegra: Add Tegra114 EMC driver
2026-01-26 19:07 [PATCH v1 0/5] Tegra114: implement EMC support Svyatoslav Ryhel
` (3 preceding siblings ...)
2026-01-26 19:07 ` [PATCH v1 4/5] dt-bindings: memory: Document Tegra114 External Memory Controller Svyatoslav Ryhel
@ 2026-01-26 19:07 ` Svyatoslav Ryhel
2026-02-17 7:21 ` Krzysztof Kozlowski
4 siblings, 1 reply; 18+ messages in thread
From: Svyatoslav Ryhel @ 2026-01-26 19:07 UTC (permalink / raw)
To: Krzysztof Kozlowski, Rob Herring, Conor Dooley, Thierry Reding,
Jonathan Hunter, Mikko Perttunen, Svyatoslav Ryhel, Sumit Gupta,
Dmitry Osipenko
Cc: linux-kernel, devicetree, linux-tegra
Introduce driver for the External Memory Controller (EMC) found in
Tegra114 SoC. It controls the external DRAM on the board. The purpose of
this driver is to program memory timing for external memory on the EMC
clock rate change.
Signed-off-by: Svyatoslav Ryhel <clamor95@gmail.com>
Reviewed-by: Mikko Perttunen <mperttunen@nvidia.com>
---
drivers/memory/tegra/Kconfig | 12 +
drivers/memory/tegra/Makefile | 1 +
drivers/memory/tegra/tegra114-emc.c | 1463 +++++++++++++++++++++++++++
3 files changed, 1476 insertions(+)
create mode 100644 drivers/memory/tegra/tegra114-emc.c
diff --git a/drivers/memory/tegra/Kconfig b/drivers/memory/tegra/Kconfig
index fc5a27791826..11e7cc357d39 100644
--- a/drivers/memory/tegra/Kconfig
+++ b/drivers/memory/tegra/Kconfig
@@ -35,6 +35,18 @@ config TEGRA30_EMC
This driver is required to change memory timings / clock rate for
external memory.
+config TEGRA114_EMC
+ tristate "NVIDIA Tegra114 External Memory Controller driver"
+ default y
+ depends on ARCH_TEGRA_114_SOC || COMPILE_TEST
+ select TEGRA124_CLK_EMC if ARCH_TEGRA
+ select PM_OPP
+ help
+ This driver is for the External Memory Controller (EMC) found on
+ Tegra114 chips. The EMC controls the external DRAM on the board.
+ This driver is required to change memory timings / clock rate for
+ external memory.
+
config TEGRA124_EMC
tristate "NVIDIA Tegra124 External Memory Controller driver"
default ARCH_TEGRA_124_SOC
diff --git a/drivers/memory/tegra/Makefile b/drivers/memory/tegra/Makefile
index 6334601e6120..6b9156de4b66 100644
--- a/drivers/memory/tegra/Makefile
+++ b/drivers/memory/tegra/Makefile
@@ -16,6 +16,7 @@ obj-$(CONFIG_TEGRA_MC) += tegra-mc.o
obj-$(CONFIG_TEGRA20_EMC) += tegra20-emc.o
obj-$(CONFIG_TEGRA30_EMC) += tegra30-emc.o
+obj-$(CONFIG_TEGRA114_EMC) += tegra114-emc.o
obj-$(CONFIG_TEGRA124_EMC) += tegra124-emc.o
obj-$(CONFIG_TEGRA210_EMC_TABLE) += tegra210-emc-table.o
obj-$(CONFIG_TEGRA210_EMC) += tegra210-emc.o
diff --git a/drivers/memory/tegra/tegra114-emc.c b/drivers/memory/tegra/tegra114-emc.c
new file mode 100644
index 000000000000..789b8e959a68
--- /dev/null
+++ b/drivers/memory/tegra/tegra114-emc.c
@@ -0,0 +1,1463 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Tegra114 External Memory Controller driver
+ *
+ * Based on downstream driver from NVIDIA and tegra124-emc.c
+ * Copyright (C) 2011-2014 NVIDIA Corporation
+ *
+ * Copyright (C) 2024 Svyatoslav Ryhel <clamor95@gmail.com>
+ */
+
+#include <linux/clk-provider.h>
+#include <linux/clk.h>
+#include <linux/clkdev.h>
+#include <linux/clk/tegra.h>
+#include <linux/debugfs.h>
+#include <linux/delay.h>
+#include <linux/interconnect-provider.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/iopoll.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/of_address.h>
+#include <linux/of_platform.h>
+#include <linux/platform_device.h>
+#include <linux/pm_opp.h>
+#include <linux/sort.h>
+#include <linux/string.h>
+
+#include <soc/tegra/common.h>
+#include <soc/tegra/fuse.h>
+#include <soc/tegra/mc.h>
+
+#include "mc.h"
+
+#define EMC_INTSTATUS 0x0
+#define EMC_INTSTATUS_REFRESH_OVERFLOW BIT(3)
+#define EMC_INTSTATUS_CLKCHANGE_COMPLETE BIT(4)
+
+#define EMC_INTMASK 0x4
+
+#define EMC_DBG 0x8
+#define EMC_DBG_READ_MUX_ASSEMBLY BIT(0)
+#define EMC_DBG_WRITE_MUX_ACTIVE BIT(1)
+#define EMC_DBG_FORCE_UPDATE BIT(2)
+#define EMC_DBG_CFG_PRIORITY BIT(24)
+
+#define EMC_CFG 0xc
+#define EMC_CFG_DSR_VTTGEN_DRV_EN BIT(18)
+#define EMC_CFG_PWR_MASK ((0xF << 28) | BIT(18))
+#define EMC_CFG_DYN_SREF BIT(28)
+#define EMC_CFG_DRAM_ACPD BIT(29)
+#define EMC_CFG_DRAM_CLKSTOP_SR BIT(30)
+#define EMC_CFG_DRAM_CLKSTOP_PD BIT(31)
+
+#define EMC_ADR_CFG 0x10
+#define EMC_ADR_CFG_EMEM_NUMDEV BIT(0)
+
+#define EMC_REFCTRL 0x20
+#define EMC_REFCTRL_DEV_SEL_SHIFT 0
+#define EMC_REFCTRL_ENABLE BIT(31)
+
+#define EMC_TIMING_CONTROL 0x28
+#define EMC_RC 0x2c
+#define EMC_RFC 0x30
+#define EMC_RAS 0x34
+#define EMC_RP 0x38
+#define EMC_R2W 0x3c
+#define EMC_W2R 0x40
+#define EMC_R2P 0x44
+#define EMC_W2P 0x48
+#define EMC_RD_RCD 0x4c
+#define EMC_WR_RCD 0x50
+#define EMC_RRD 0x54
+#define EMC_REXT 0x58
+#define EMC_WDV 0x5c
+#define EMC_QUSE 0x60
+#define EMC_QRST 0x64
+#define EMC_QSAFE 0x68
+#define EMC_RDV 0x6c
+#define EMC_REFRESH 0x70
+#define EMC_BURST_REFRESH_NUM 0x74
+#define EMC_PDEX2WR 0x78
+#define EMC_PDEX2RD 0x7c
+#define EMC_PCHG2PDEN 0x80
+#define EMC_ACT2PDEN 0x84
+#define EMC_AR2PDEN 0x88
+#define EMC_RW2PDEN 0x8c
+#define EMC_TXSR 0x90
+#define EMC_TCKE 0x94
+#define EMC_TFAW 0x98
+#define EMC_TRPAB 0x9c
+#define EMC_TCLKSTABLE 0xa0
+#define EMC_TCLKSTOP 0xa4
+#define EMC_TREFBW 0xa8
+#define EMC_QUSE_EXTRA 0xac
+#define EMC_ODT_WRITE 0xb0
+#define EMC_ODT_READ 0xb4
+#define EMC_WEXT 0xb8
+#define EMC_CTT 0xbc
+#define EMC_RFC_SLR 0xc0
+#define EMC_MRS_WAIT_CNT2 0xc4
+
+#define EMC_MRS_WAIT_CNT 0xc8
+#define EMC_MRS_WAIT_CNT_SHORT_WAIT_SHIFT 0
+#define EMC_MRS_WAIT_CNT_SHORT_WAIT_MASK \
+ (0x3FF << EMC_MRS_WAIT_CNT_SHORT_WAIT_SHIFT)
+#define EMC_MRS_WAIT_CNT_LONG_WAIT_SHIFT 16
+#define EMC_MRS_WAIT_CNT_LONG_WAIT_MASK \
+ (0x3FF << EMC_MRS_WAIT_CNT_LONG_WAIT_SHIFT)
+
+#define EMC_MRS 0xcc
+#define EMC_MODE_SET_DLL_RESET BIT(8)
+#define EMC_MODE_SET_LONG_CNT BIT(26)
+#define EMC_EMRS 0xd0
+#define EMC_REF 0xd4
+#define EMC_PRE 0xd8
+
+#define EMC_SELF_REF 0xe0
+#define EMC_SELF_REF_CMD_ENABLED BIT(0)
+#define EMC_SELF_REF_DEV_SEL_SHIFT 30
+
+#define EMC_MRW 0xe8
+
+#define EMC_MRR 0xec
+#define EMC_MRR_MA_SHIFT 16
+#define LPDDR2_MR4_TEMP_SHIFT 0
+
+#define EMC_XM2DQSPADCTRL3 0xf8
+#define EMC_FBIO_SPARE 0x100
+
+#define EMC_FBIO_CFG5 0x104
+#define EMC_FBIO_CFG5_DRAM_TYPE_MASK 0x3
+#define EMC_FBIO_CFG5_DRAM_TYPE_SHIFT 0
+
+#define EMC_FBIO_CFG6 0x114
+#define EMC_EMRS2 0x12c
+#define EMC_MRW2 0x134
+#define EMC_MRW4 0x13c
+#define EMC_EINPUT 0x14c
+#define EMC_EINPUT_DURATION 0x150
+#define EMC_PUTERM_EXTRA 0x154
+#define EMC_TCKESR 0x158
+#define EMC_TPD 0x15c
+
+#define EMC_AUTO_CAL_CONFIG 0x2a4
+#define EMC_AUTO_CAL_CONFIG_AUTO_CAL_START BIT(31)
+#define EMC_AUTO_CAL_INTERVAL 0x2a8
+#define EMC_AUTO_CAL_STATUS 0x2ac
+#define EMC_AUTO_CAL_STATUS_ACTIVE BIT(31)
+#define EMC_STATUS 0x2b4
+#define EMC_STATUS_TIMING_UPDATE_STALLED BIT(23)
+
+#define EMC_CFG_2 0x2b8
+#define EMC_CFG_2_CLKCHANGE_REQ_ENABLE BIT(0)
+#define EMC_CFG_2_CLKCHANGE_PD_ENABLE BIT(1)
+#define EMC_CFG_2_CLKCHANGE_SR_ENABLE BIT(2)
+
+#define EMC_CFG_DIG_DLL 0x2bc
+#define EMC_CFG_DIG_DLL_PERIOD 0x2c0
+#define EMC_RDV_MASK 0x2cc
+#define EMC_WDV_MASK 0x2d0
+#define EMC_CTT_DURATION 0x2d8
+#define EMC_CTT_TERM_CTRL 0x2dc
+#define EMC_ZCAL_INTERVAL 0x2e0
+#define EMC_ZCAL_WAIT_CNT 0x2e4
+
+#define EMC_ZQ_CAL 0x2ec
+#define EMC_ZQ_CAL_CMD BIT(0)
+#define EMC_ZQ_CAL_LONG BIT(4)
+#define EMC_ZQ_CAL_LONG_CMD_DEV0 \
+ (DRAM_DEV_SEL_0 | EMC_ZQ_CAL_LONG | EMC_ZQ_CAL_CMD)
+#define EMC_ZQ_CAL_LONG_CMD_DEV1 \
+ (DRAM_DEV_SEL_1 | EMC_ZQ_CAL_LONG | EMC_ZQ_CAL_CMD)
+
+#define EMC_XM2CMDPADCTRL 0x2f0
+#define EMC_XM2DQSPADCTRL 0x2f8
+#define EMC_XM2DQSPADCTRL2 0x2fc
+#define EMC_XM2DQSPADCTRL2_RX_FT_REC_ENABLE BIT(0)
+#define EMC_XM2DQSPADCTRL2_VREF_ENABLE BIT(5)
+#define EMC_XM2DQPADCTRL 0x300
+#define EMC_XM2DQPADCTRL2 0x304
+#define EMC_XM2CLKPADCTRL 0x308
+#define EMC_XM2COMPPADCTRL 0x30c
+#define EMC_XM2VTTGENPADCTRL 0x310
+#define EMC_XM2VTTGENPADCTRL2 0x314
+#define EMC_XM2QUSEPADCTRL 0x318
+#define EMC_XM2DQSPADCTRL4 0x320
+#define EMC_DLL_XFORM_DQS0 0x328
+#define EMC_DLL_XFORM_DQS1 0x32c
+#define EMC_DLL_XFORM_DQS2 0x330
+#define EMC_DLL_XFORM_DQS3 0x334
+#define EMC_DLL_XFORM_DQS4 0x338
+#define EMC_DLL_XFORM_DQS5 0x33c
+#define EMC_DLL_XFORM_DQS6 0x340
+#define EMC_DLL_XFORM_DQS7 0x344
+#define EMC_DLL_XFORM_QUSE0 0x348
+#define EMC_DLL_XFORM_QUSE1 0x34c
+#define EMC_DLL_XFORM_QUSE2 0x350
+#define EMC_DLL_XFORM_QUSE3 0x354
+#define EMC_DLL_XFORM_QUSE4 0x358
+#define EMC_DLL_XFORM_QUSE5 0x35c
+#define EMC_DLL_XFORM_QUSE6 0x360
+#define EMC_DLL_XFORM_QUSE7 0x364
+#define EMC_DLL_XFORM_DQ0 0x368
+#define EMC_DLL_XFORM_DQ1 0x36c
+#define EMC_DLL_XFORM_DQ2 0x370
+#define EMC_DLL_XFORM_DQ3 0x374
+#define EMC_DLI_TRIM_TXDQS0 0x3a8
+#define EMC_DLI_TRIM_TXDQS1 0x3ac
+#define EMC_DLI_TRIM_TXDQS2 0x3b0
+#define EMC_DLI_TRIM_TXDQS3 0x3b4
+#define EMC_DLI_TRIM_TXDQS4 0x3b8
+#define EMC_DLI_TRIM_TXDQS5 0x3bc
+#define EMC_DLI_TRIM_TXDQS6 0x3c0
+#define EMC_DLI_TRIM_TXDQS7 0x3c4
+#define EMC_STALL_THEN_EXE_AFTER_CLKCHANGE 0x3cc
+#define EMC_SEL_DPD_CTRL 0x3d8
+#define EMC_SEL_DPD_CTRL_DATA_SEL_DPD BIT(8)
+#define EMC_SEL_DPD_CTRL_ODT_SEL_DPD BIT(5)
+#define EMC_SEL_DPD_CTRL_RESET_SEL_DPD BIT(4)
+#define EMC_SEL_DPD_CTRL_CA_SEL_DPD BIT(3)
+#define EMC_SEL_DPD_CTRL_CLK_SEL_DPD BIT(2)
+#define EMC_SEL_DPD_CTRL_DDR3_MASK \
+ ((0xf << 2) | BIT(8))
+#define EMC_SEL_DPD_CTRL_MASK \
+ ((0x3 << 2) | BIT(5) | BIT(8))
+#define EMC_PRE_REFRESH_REQ_CNT 0x3dc
+#define EMC_DYN_SELF_REF_CONTROL 0x3e0
+#define EMC_TXSRDLL 0x3e4
+#define EMC_CCFIFO_ADDR 0x3e8
+#define EMC_CCFIFO_DATA 0x3ec
+#define EMC_CCFIFO_STATUS 0x3f0
+#define EMC_CDB_CNTL_1 0x3f4
+#define EMC_CDB_CNTL_2 0x3f8
+#define EMC_XM2CLKPADCTRL2 0x3fc
+#define EMC_AUTO_CAL_CONFIG2 0x458
+#define EMC_AUTO_CAL_CONFIG3 0x45c
+#define EMC_IBDLY 0x468
+#define EMC_DLL_XFORM_ADDR0 0x46c
+#define EMC_DLL_XFORM_ADDR1 0x470
+#define EMC_DLL_XFORM_ADDR2 0x474
+#define EMC_DSR_VTTGEN_DRV 0x47c
+#define EMC_TXDSRVTTGEN 0x480
+#define EMC_XM2CMDPADCTRL4 0x484
+
+#define DRAM_DEV_SEL_ALL 0
+#define DRAM_DEV_SEL_0 BIT(31)
+#define DRAM_DEV_SEL_1 BIT(30)
+
+#define EMC_CFG_POWER_FEATURES_MASK \
+ (EMC_CFG_DYN_SREF | EMC_CFG_DRAM_ACPD | EMC_CFG_DRAM_CLKSTOP_SR | \
+ EMC_CFG_DRAM_CLKSTOP_PD | EMC_CFG_DSR_VTTGEN_DRV_EN)
+#define EMC_REFCTRL_DEV_SEL(n) ((((n) > 1) ? 0 : 2) << EMC_REFCTRL_DEV_SEL_SHIFT)
+#define EMC_DRAM_DEV_SEL(n) (((n) > 1) ? DRAM_DEV_SEL_ALL : DRAM_DEV_SEL_0)
+
+/* Maximum amount of time in us. to wait for changes to become effective */
+#define EMC_STATUS_UPDATE_TIMEOUT 1000
+
+enum emc_dram_type {
+ DRAM_TYPE_DDR3,
+ DRAM_TYPE_DDR1,
+ DRAM_TYPE_LPDDR2,
+ DRAM_TYPE_DDR2
+};
+
+enum emc_dll_change {
+ DLL_CHANGE_NONE,
+ DLL_CHANGE_ON,
+ DLL_CHANGE_OFF
+};
+
+static const unsigned long emc_burst_regs[] = {
+ EMC_RC,
+ EMC_RFC,
+ EMC_RAS,
+ EMC_RP,
+ EMC_R2W,
+ EMC_W2R,
+ EMC_R2P,
+ EMC_W2P,
+ EMC_RD_RCD,
+ EMC_WR_RCD,
+ EMC_RRD,
+ EMC_REXT,
+ EMC_WEXT,
+ EMC_WDV,
+ EMC_WDV_MASK,
+ EMC_QUSE,
+ EMC_IBDLY,
+ EMC_EINPUT,
+ EMC_EINPUT_DURATION,
+ EMC_PUTERM_EXTRA,
+ EMC_CDB_CNTL_1,
+ EMC_CDB_CNTL_2,
+ EMC_QRST,
+ EMC_QSAFE,
+ EMC_RDV,
+ EMC_RDV_MASK,
+ EMC_REFRESH,
+ EMC_BURST_REFRESH_NUM,
+ EMC_PRE_REFRESH_REQ_CNT,
+ EMC_PDEX2WR,
+ EMC_PDEX2RD,
+ EMC_PCHG2PDEN,
+ EMC_ACT2PDEN,
+ EMC_AR2PDEN,
+ EMC_RW2PDEN,
+ EMC_TXSR,
+ EMC_TXSRDLL,
+ EMC_TCKE,
+ EMC_TCKESR,
+ EMC_TPD,
+ EMC_TFAW,
+ EMC_TRPAB,
+ EMC_TCLKSTABLE,
+ EMC_TCLKSTOP,
+ EMC_TREFBW,
+ EMC_QUSE_EXTRA,
+ EMC_FBIO_CFG6,
+ EMC_ODT_WRITE,
+ EMC_ODT_READ,
+ EMC_FBIO_CFG5,
+ EMC_CFG_DIG_DLL,
+ EMC_CFG_DIG_DLL_PERIOD,
+ EMC_DLL_XFORM_DQS0,
+ EMC_DLL_XFORM_DQS1,
+ EMC_DLL_XFORM_DQS2,
+ EMC_DLL_XFORM_DQS3,
+ EMC_DLL_XFORM_DQS4,
+ EMC_DLL_XFORM_DQS5,
+ EMC_DLL_XFORM_DQS6,
+ EMC_DLL_XFORM_DQS7,
+ EMC_DLL_XFORM_QUSE0,
+ EMC_DLL_XFORM_QUSE1,
+ EMC_DLL_XFORM_QUSE2,
+ EMC_DLL_XFORM_QUSE3,
+ EMC_DLL_XFORM_QUSE4,
+ EMC_DLL_XFORM_QUSE5,
+ EMC_DLL_XFORM_QUSE6,
+ EMC_DLL_XFORM_QUSE7,
+ EMC_DLI_TRIM_TXDQS0,
+ EMC_DLI_TRIM_TXDQS1,
+ EMC_DLI_TRIM_TXDQS2,
+ EMC_DLI_TRIM_TXDQS3,
+ EMC_DLI_TRIM_TXDQS4,
+ EMC_DLI_TRIM_TXDQS5,
+ EMC_DLI_TRIM_TXDQS6,
+ EMC_DLI_TRIM_TXDQS7,
+ EMC_DLL_XFORM_DQ0,
+ EMC_DLL_XFORM_DQ1,
+ EMC_DLL_XFORM_DQ2,
+ EMC_DLL_XFORM_DQ3,
+ EMC_XM2CMDPADCTRL,
+ EMC_XM2CMDPADCTRL4,
+ EMC_XM2DQPADCTRL2,
+ EMC_XM2CLKPADCTRL,
+ EMC_XM2COMPPADCTRL,
+ EMC_XM2VTTGENPADCTRL,
+ EMC_XM2VTTGENPADCTRL2,
+ EMC_XM2DQSPADCTRL3,
+ EMC_XM2DQSPADCTRL4,
+ EMC_DSR_VTTGEN_DRV,
+ EMC_TXDSRVTTGEN,
+ EMC_FBIO_SPARE,
+ EMC_ZCAL_WAIT_CNT,
+ EMC_MRS_WAIT_CNT2,
+ EMC_CTT,
+ EMC_CTT_DURATION,
+ EMC_DYN_SELF_REF_CONTROL,
+};
+
+struct emc_timing {
+ unsigned long rate;
+
+ u32 emc_burst_data[ARRAY_SIZE(emc_burst_regs)];
+
+ u32 emc_auto_cal_config;
+ u32 emc_auto_cal_config2;
+ u32 emc_auto_cal_config3;
+ u32 emc_auto_cal_interval;
+ u32 emc_cfg;
+ u32 emc_ctt_term_ctrl;
+ u32 emc_mode_1;
+ u32 emc_mode_2;
+ u32 emc_mode_4;
+ u32 emc_mode_reset;
+ u32 emc_mrs_wait_cnt;
+ u32 emc_sel_dpd_ctrl;
+ u32 emc_xm2dqspadctrl2;
+ u32 emc_zcal_cnt_long;
+ u32 emc_zcal_interval;
+};
+
+enum emc_rate_request_type {
+ EMC_RATE_DEBUG,
+ EMC_RATE_ICC,
+ EMC_RATE_TYPE_MAX,
+};
+
+struct emc_rate_request {
+ unsigned long min_rate;
+ unsigned long max_rate;
+};
+
+struct tegra_emc {
+ struct device *dev;
+ struct tegra_mc *mc;
+ void __iomem *regs;
+ unsigned int irq;
+ struct clk *clk;
+
+ enum emc_dram_type dram_type;
+ unsigned int dram_num;
+
+ struct emc_timing last_timing;
+ struct emc_timing *timings;
+ unsigned int num_timings;
+
+ struct {
+ struct dentry *root;
+ unsigned long min_rate;
+ unsigned long max_rate;
+ } debugfs;
+
+ struct icc_provider provider;
+
+ /*
+ * There are multiple sources in the EMC driver which could request
+ * a min/max clock rate, these rates are contained in this array.
+ */
+ struct emc_rate_request requested_rate[EMC_RATE_TYPE_MAX];
+
+ /* protect shared rate-change code path */
+ struct mutex rate_lock;
+};
+
+static irqreturn_t tegra_emc_isr(int irq, void *data)
+{
+ struct tegra_emc *emc = data;
+ u32 intmask = EMC_INTSTATUS_REFRESH_OVERFLOW;
+ u32 status;
+
+ status = readl_relaxed(emc->regs + EMC_INTSTATUS) & intmask;
+ if (!status)
+ return IRQ_NONE;
+
+ /* notify about HW problem */
+ if (status & EMC_INTSTATUS_REFRESH_OVERFLOW)
+ dev_err_ratelimited(emc->dev,
+ "refresh request overflow timeout\n");
+
+ /* clear interrupts */
+ writel_relaxed(status, emc->regs + EMC_INTSTATUS);
+
+ return IRQ_HANDLED;
+}
+
+/* Timing change sequence functions */
+
+static void emc_ccfifo_writel(struct tegra_emc *emc, u32 value,
+ unsigned long offset)
+{
+ writel(value, emc->regs + EMC_CCFIFO_DATA);
+ writel(offset, emc->regs + EMC_CCFIFO_ADDR);
+}
+
+static void emc_seq_update_timing(struct tegra_emc *emc)
+{
+ int ret;
+ u32 value;
+
+ writel(1, emc->regs + EMC_TIMING_CONTROL);
+
+ ret = readl_poll_timeout_atomic(emc->regs + EMC_STATUS, value,
+ !(value & EMC_STATUS_TIMING_UPDATE_STALLED),
+ 1, EMC_STATUS_UPDATE_TIMEOUT);
+ if (ret)
+ dev_err(emc->dev, "timing update timed out\n");
+}
+
+static void emc_seq_disable_auto_cal(struct tegra_emc *emc)
+{
+ int ret;
+ u32 value;
+
+ writel(0, emc->regs + EMC_AUTO_CAL_INTERVAL);
+
+ ret = readl_poll_timeout_atomic(emc->regs + EMC_AUTO_CAL_STATUS, value,
+ !(value & EMC_AUTO_CAL_STATUS_ACTIVE),
+ 1, EMC_STATUS_UPDATE_TIMEOUT);
+ if (ret)
+ dev_err(emc->dev, "auto cal disable timed out\n");
+}
+
+static void emc_seq_wait_clkchange(struct tegra_emc *emc)
+{
+ int ret;
+ u32 value;
+
+ ret = readl_poll_timeout_atomic(emc->regs + EMC_INTSTATUS, value,
+ value & EMC_INTSTATUS_CLKCHANGE_COMPLETE,
+ 1, EMC_STATUS_UPDATE_TIMEOUT);
+ if (ret)
+ dev_err(emc->dev, "clock change timed out\n");
+}
+
+static struct emc_timing *tegra_emc_find_timing(struct tegra_emc *emc,
+ unsigned long rate)
+{
+ struct emc_timing *timing = NULL;
+ unsigned int i;
+
+ for (i = 0; i < emc->num_timings; i++) {
+ if (emc->timings[i].rate == rate) {
+ timing = &emc->timings[i];
+ break;
+ }
+ }
+
+ if (!timing) {
+ dev_err(emc->dev, "no timing for rate %lu\n", rate);
+ return NULL;
+ }
+
+ return timing;
+}
+
+static int tegra_emc_prepare_timing_change(struct tegra_emc *emc,
+ unsigned long rate)
+{
+ struct emc_timing *timing = tegra_emc_find_timing(emc, rate);
+ struct emc_timing *last = &emc->last_timing;
+ enum emc_dll_change dll_change;
+ unsigned int pre_wait = 0;
+ u32 val, mask;
+ bool next_dll_enabled = !(timing->emc_mode_1 & 0x1);
+ bool last_dll_enabled = !(last->emc_mode_1 & 0x1);
+ bool update = false;
+ unsigned int i;
+
+ if (!timing)
+ return -ENOENT;
+
+ if (next_dll_enabled == last_dll_enabled)
+ dll_change = DLL_CHANGE_NONE;
+ else if (next_dll_enabled)
+ dll_change = DLL_CHANGE_ON;
+ else
+ dll_change = DLL_CHANGE_OFF;
+
+ /* Clear CLKCHANGE_COMPLETE interrupts */
+ writel(EMC_INTSTATUS_CLKCHANGE_COMPLETE, emc->regs + EMC_INTSTATUS);
+
+ /* Disable dynamic self-refresh */
+ val = readl(emc->regs + EMC_CFG);
+ if (val & EMC_CFG_PWR_MASK) {
+ val &= ~EMC_CFG_POWER_FEATURES_MASK;
+ writel(val, emc->regs + EMC_CFG);
+
+ pre_wait = 5;
+ }
+
+ /* Disable SEL_DPD_CTRL for clock change */
+ if (emc->dram_type == DRAM_TYPE_DDR3)
+ mask = EMC_SEL_DPD_CTRL_DDR3_MASK;
+ else
+ mask = EMC_SEL_DPD_CTRL_MASK;
+
+ val = readl(emc->regs + EMC_SEL_DPD_CTRL);
+ if (val & mask) {
+ val &= ~mask;
+ writel(val, emc->regs + EMC_SEL_DPD_CTRL);
+ }
+
+ /* Prepare DQ/DQS for clock change */
+ val = readl(emc->regs + EMC_XM2DQSPADCTRL2);
+ if (timing->emc_xm2dqspadctrl2 & EMC_XM2DQSPADCTRL2_VREF_ENABLE &&
+ !(val & EMC_XM2DQSPADCTRL2_VREF_ENABLE)) {
+ val |= EMC_XM2DQSPADCTRL2_VREF_ENABLE;
+ update = true;
+ }
+
+ if (timing->emc_xm2dqspadctrl2 & EMC_XM2DQSPADCTRL2_RX_FT_REC_ENABLE &&
+ !(val & EMC_XM2DQSPADCTRL2_RX_FT_REC_ENABLE)) {
+ val |= EMC_XM2DQSPADCTRL2_RX_FT_REC_ENABLE;
+ update = true;
+ }
+
+ if (update) {
+ writel(val, emc->regs + EMC_XM2DQSPADCTRL2);
+ if (pre_wait < 30)
+ pre_wait = 30;
+ }
+
+ /* Wait to settle */
+ if (pre_wait) {
+ emc_seq_update_timing(emc);
+ udelay(pre_wait);
+ }
+
+ /* Program CTT_TERM control */
+ if (last->emc_ctt_term_ctrl != timing->emc_ctt_term_ctrl) {
+ emc_seq_disable_auto_cal(emc);
+ writel(timing->emc_ctt_term_ctrl,
+ emc->regs + EMC_CTT_TERM_CTRL);
+ emc_seq_update_timing(emc);
+ }
+
+ /* Program burst shadow registers */
+ for (i = 0; i < ARRAY_SIZE(timing->emc_burst_data); ++i)
+ writel(timing->emc_burst_data[i],
+ emc->regs + emc_burst_regs[i]);
+
+ writel(timing->emc_xm2dqspadctrl2, emc->regs + EMC_XM2DQSPADCTRL2);
+ writel(timing->emc_zcal_interval, emc->regs + EMC_ZCAL_INTERVAL);
+
+ tegra_mc_write_emem_configuration(emc->mc, timing->rate);
+
+ val = timing->emc_cfg & ~EMC_CFG_POWER_FEATURES_MASK;
+ emc_ccfifo_writel(emc, val, EMC_CFG);
+
+ /* Program AUTO_CAL_CONFIG */
+ if (timing->emc_auto_cal_config2 != last->emc_auto_cal_config2)
+ emc_ccfifo_writel(emc, timing->emc_auto_cal_config2,
+ EMC_AUTO_CAL_CONFIG2);
+
+ if (timing->emc_auto_cal_config3 != last->emc_auto_cal_config3)
+ emc_ccfifo_writel(emc, timing->emc_auto_cal_config3,
+ EMC_AUTO_CAL_CONFIG3);
+
+ if (timing->emc_auto_cal_config != last->emc_auto_cal_config) {
+ val = timing->emc_auto_cal_config;
+ val &= EMC_AUTO_CAL_CONFIG_AUTO_CAL_START;
+ emc_ccfifo_writel(emc, val, EMC_AUTO_CAL_CONFIG);
+ }
+
+ /* DDR3: predict MRS long wait count */
+ if (emc->dram_type == DRAM_TYPE_DDR3 &&
+ dll_change == DLL_CHANGE_ON) {
+ u32 cnt = 512;
+
+ if (timing->emc_zcal_interval != 0 &&
+ last->emc_zcal_interval == 0)
+ cnt -= emc->dram_num * 256;
+
+ val = (timing->emc_mrs_wait_cnt
+ & EMC_MRS_WAIT_CNT_SHORT_WAIT_MASK)
+ >> EMC_MRS_WAIT_CNT_SHORT_WAIT_SHIFT;
+ if (cnt < val)
+ cnt = val;
+
+ val = timing->emc_mrs_wait_cnt
+ & ~EMC_MRS_WAIT_CNT_LONG_WAIT_MASK;
+ val |= (cnt << EMC_MRS_WAIT_CNT_LONG_WAIT_SHIFT)
+ & EMC_MRS_WAIT_CNT_LONG_WAIT_MASK;
+
+ writel(val, emc->regs + EMC_MRS_WAIT_CNT);
+ }
+
+ /* DDR3: Turn off DLL and enter self-refresh */
+ if (emc->dram_type == DRAM_TYPE_DDR3 && dll_change == DLL_CHANGE_OFF)
+ emc_ccfifo_writel(emc, timing->emc_mode_1, EMC_EMRS);
+
+ /* Disable refresh controller */
+ emc_ccfifo_writel(emc, EMC_REFCTRL_DEV_SEL(emc->dram_num),
+ EMC_REFCTRL);
+ if (emc->dram_type == DRAM_TYPE_DDR3)
+ emc_ccfifo_writel(emc, EMC_DRAM_DEV_SEL(emc->dram_num) |
+ EMC_SELF_REF_CMD_ENABLED,
+ EMC_SELF_REF);
+
+ /* Flow control marker */
+ emc_ccfifo_writel(emc, 1, EMC_STALL_THEN_EXE_AFTER_CLKCHANGE);
+
+ /* DDR3: Exit self-refresh */
+ if (emc->dram_type == DRAM_TYPE_DDR3)
+ emc_ccfifo_writel(emc, EMC_DRAM_DEV_SEL(emc->dram_num),
+ EMC_SELF_REF);
+ emc_ccfifo_writel(emc, EMC_REFCTRL_DEV_SEL(emc->dram_num) |
+ EMC_REFCTRL_ENABLE,
+ EMC_REFCTRL);
+
+ /* Set DRAM mode registers */
+ if (emc->dram_type == DRAM_TYPE_DDR3) {
+ if (timing->emc_mode_1 != last->emc_mode_1)
+ emc_ccfifo_writel(emc, timing->emc_mode_1, EMC_EMRS);
+ if (timing->emc_mode_2 != last->emc_mode_2)
+ emc_ccfifo_writel(emc, timing->emc_mode_2, EMC_EMRS2);
+
+ if (timing->emc_mode_reset != last->emc_mode_reset ||
+ dll_change == DLL_CHANGE_ON) {
+ val = timing->emc_mode_reset;
+ if (dll_change == DLL_CHANGE_ON) {
+ val |= EMC_MODE_SET_DLL_RESET;
+ val |= EMC_MODE_SET_LONG_CNT;
+ } else {
+ val &= ~EMC_MODE_SET_DLL_RESET;
+ }
+ emc_ccfifo_writel(emc, val, EMC_MRS);
+ }
+ } else {
+ if (timing->emc_mode_2 != last->emc_mode_2)
+ emc_ccfifo_writel(emc, timing->emc_mode_2, EMC_MRW2);
+ if (timing->emc_mode_1 != last->emc_mode_1)
+ emc_ccfifo_writel(emc, timing->emc_mode_1, EMC_MRW);
+ if (timing->emc_mode_4 != last->emc_mode_4)
+ emc_ccfifo_writel(emc, timing->emc_mode_4, EMC_MRW4);
+ }
+
+ /* Issue ZCAL command if turning ZCAL on */
+ if (timing->emc_zcal_interval != 0 && last->emc_zcal_interval == 0) {
+ emc_ccfifo_writel(emc, EMC_ZQ_CAL_LONG_CMD_DEV0, EMC_ZQ_CAL);
+ if (emc->dram_num > 1)
+ emc_ccfifo_writel(emc, EMC_ZQ_CAL_LONG_CMD_DEV1,
+ EMC_ZQ_CAL);
+ }
+
+ /* Write to RO register to remove stall after change */
+ emc_ccfifo_writel(emc, 0, EMC_CCFIFO_STATUS);
+
+ /* Disable AUTO_CAL for clock change */
+ emc_seq_disable_auto_cal(emc);
+
+ /* Read register to wait until programming has settled */
+ mc_readl(emc->mc, MC_EMEM_ADR_CFG);
+
+ return 0;
+}
+
+static void tegra_emc_complete_timing_change(struct tegra_emc *emc,
+ unsigned long rate)
+{
+ struct emc_timing *timing = tegra_emc_find_timing(emc, rate);
+ struct emc_timing *last = &emc->last_timing;
+
+ if (!timing)
+ return;
+
+ /* Wait until the state machine has settled */
+ emc_seq_wait_clkchange(emc);
+
+ /* Restore AUTO_CAL */
+ if (timing->emc_ctt_term_ctrl != last->emc_ctt_term_ctrl)
+ writel(timing->emc_auto_cal_interval,
+ emc->regs + EMC_AUTO_CAL_INTERVAL);
+
+ /* Restore dynamic self-refresh */
+ if (timing->emc_cfg & EMC_CFG_PWR_MASK)
+ writel(timing->emc_cfg, emc->regs + EMC_CFG);
+
+ /* Set ZCAL wait count */
+ writel(timing->emc_zcal_cnt_long, emc->regs + EMC_ZCAL_WAIT_CNT);
+
+ /* Wait for timing to settle */
+ udelay(2);
+
+ /* Reprogram SEL_DPD_CTRL */
+ writel(timing->emc_sel_dpd_ctrl, emc->regs + EMC_SEL_DPD_CTRL);
+ emc_seq_update_timing(emc);
+
+ emc->last_timing = *timing;
+}
+
+/* Initialization and deinitialization */
+
+static void emc_read_current_timing(struct tegra_emc *emc,
+ struct emc_timing *timing)
+{
+ unsigned int i;
+
+ for (i = 0; i < ARRAY_SIZE(emc_burst_regs); ++i)
+ timing->emc_burst_data[i] =
+ readl(emc->regs + emc_burst_regs[i]);
+
+ timing->emc_cfg = readl(emc->regs + EMC_CFG);
+
+ timing->emc_auto_cal_interval = 0;
+ timing->emc_zcal_cnt_long = 0;
+ timing->emc_mode_1 = 0;
+ timing->emc_mode_2 = 0;
+ timing->emc_mode_4 = 0;
+ timing->emc_mode_reset = 0;
+}
+
+static int emc_init(struct tegra_emc *emc)
+{
+ u32 emc_cfg, emc_dbg;
+ u32 intmask = EMC_INTSTATUS_REFRESH_OVERFLOW;
+ const char *dram_type_str;
+
+ emc->dram_type = readl(emc->regs + EMC_FBIO_CFG5);
+
+ emc->dram_type &= EMC_FBIO_CFG5_DRAM_TYPE_MASK;
+ emc->dram_type >>= EMC_FBIO_CFG5_DRAM_TYPE_SHIFT;
+
+ emc->dram_num = tegra_mc_get_emem_device_count(emc->mc);
+
+ emc_cfg = readl_relaxed(emc->regs + EMC_CFG_2);
+
+ /* enable EMC and CAR to handshake on PLL divider/source changes */
+ emc_cfg |= EMC_CFG_2_CLKCHANGE_REQ_ENABLE;
+
+ /* configure clock change mode accordingly to DRAM type */
+ if (emc->dram_type == DRAM_TYPE_LPDDR2)
+ emc_cfg |= EMC_CFG_2_CLKCHANGE_PD_ENABLE;
+ else
+ emc_cfg &= ~EMC_CFG_2_CLKCHANGE_PD_ENABLE;
+
+ writel_relaxed(emc_cfg, emc->regs + EMC_CFG_2);
+
+ /* initialize interrupt */
+ writel_relaxed(intmask, emc->regs + EMC_INTMASK);
+ writel_relaxed(0xffffffff, emc->regs + EMC_INTSTATUS);
+
+ /* ensure that unwanted debug features are disabled */
+ emc_dbg = readl_relaxed(emc->regs + EMC_DBG);
+ emc_dbg |= EMC_DBG_CFG_PRIORITY;
+ emc_dbg &= ~EMC_DBG_READ_MUX_ASSEMBLY;
+ emc_dbg &= ~EMC_DBG_WRITE_MUX_ACTIVE;
+ emc_dbg &= ~EMC_DBG_FORCE_UPDATE;
+ writel_relaxed(emc_dbg, emc->regs + EMC_DBG);
+
+ switch (emc->dram_type) {
+ case DRAM_TYPE_DDR1:
+ dram_type_str = "DDR1";
+ break;
+ case DRAM_TYPE_LPDDR2:
+ dram_type_str = "LPDDR2";
+ break;
+ case DRAM_TYPE_DDR2:
+ dram_type_str = "DDR2";
+ break;
+ case DRAM_TYPE_DDR3:
+ dram_type_str = "DDR3";
+ break;
+ }
+
+ dev_info_once(emc->dev, "%u %s %s attached\n", emc->dram_num,
+ dram_type_str, emc->dram_num == 2 ? "devices" : "device");
+
+ emc_read_current_timing(emc, &emc->last_timing);
+
+ return 0;
+}
+
+static int load_one_timing_from_dt(struct tegra_emc *emc,
+ struct emc_timing *timing,
+ struct device_node *node)
+{
+ u32 value;
+ int err;
+
+ err = of_property_read_u32(node, "clock-frequency", &value);
+ if (err) {
+ dev_err(emc->dev, "timing %pOFn: failed to read rate: %d\n",
+ node, err);
+ return err;
+ }
+
+ timing->rate = value;
+
+ err = of_property_read_u32_array(node, "nvidia,emc-configuration",
+ timing->emc_burst_data,
+ ARRAY_SIZE(timing->emc_burst_data));
+ if (err) {
+ dev_err(emc->dev,
+ "timing %pOFn: failed to read emc burst data: %d\n",
+ node, err);
+ return err;
+ }
+
+#define EMC_READ_PROP(prop, dtprop) { \
+ err = of_property_read_u32(node, dtprop, &timing->prop); \
+ if (err) { \
+ dev_err(emc->dev, "timing %pOFn: failed to read " #prop ": %d\n", \
+ node, err); \
+ return err; \
+ } \
+}
+
+ EMC_READ_PROP(emc_auto_cal_config, "nvidia,emc-auto-cal-config")
+ EMC_READ_PROP(emc_auto_cal_config2, "nvidia,emc-auto-cal-config2")
+ EMC_READ_PROP(emc_auto_cal_config3, "nvidia,emc-auto-cal-config3")
+ EMC_READ_PROP(emc_auto_cal_interval, "nvidia,emc-auto-cal-interval")
+ EMC_READ_PROP(emc_cfg, "nvidia,emc-cfg")
+ EMC_READ_PROP(emc_ctt_term_ctrl, "nvidia,emc-ctt-term-ctrl")
+ EMC_READ_PROP(emc_mode_1, "nvidia,emc-mode-1")
+ EMC_READ_PROP(emc_mode_2, "nvidia,emc-mode-2")
+ EMC_READ_PROP(emc_mode_4, "nvidia,emc-mode-4")
+ EMC_READ_PROP(emc_mode_reset, "nvidia,emc-mode-reset")
+ EMC_READ_PROP(emc_mrs_wait_cnt, "nvidia,emc-mrs-wait-cnt")
+ EMC_READ_PROP(emc_sel_dpd_ctrl, "nvidia,emc-sel-dpd-ctrl")
+ EMC_READ_PROP(emc_xm2dqspadctrl2, "nvidia,emc-xm2dqspadctrl2")
+ EMC_READ_PROP(emc_zcal_cnt_long, "nvidia,emc-zcal-cnt-long")
+ EMC_READ_PROP(emc_zcal_interval, "nvidia,emc-zcal-interval")
+
+#undef EMC_READ_PROP
+
+ return 0;
+}
+
+static int cmp_timings(const void *_a, const void *_b)
+{
+ const struct emc_timing *a = _a;
+ const struct emc_timing *b = _b;
+
+ if (a->rate < b->rate)
+ return -1;
+ else if (a->rate == b->rate)
+ return 0;
+ else
+ return 1;
+}
+
+static int emc_check_mc_timings(struct tegra_emc *emc)
+{
+ struct tegra_mc *mc = emc->mc;
+ unsigned int i;
+
+ if (emc->num_timings != mc->num_timings) {
+ dev_err(emc->dev, "emc/mc timings number mismatch: %u %u\n",
+ emc->num_timings, mc->num_timings);
+ return -EINVAL;
+ }
+
+ for (i = 0; i < mc->num_timings; i++) {
+ if (emc->timings[i].rate != mc->timings[i].rate) {
+ dev_err(emc->dev,
+ "emc/mc timing rate mismatch: %lu %lu\n",
+ emc->timings[i].rate, mc->timings[i].rate);
+ return -EINVAL;
+ }
+ }
+
+ return 0;
+}
+
+static int tegra_emc_load_timings_from_dt(struct tegra_emc *emc,
+ struct device_node *node)
+{
+ int child_count = of_get_child_count(node);
+ struct emc_timing *timing;
+ unsigned int i = 0;
+ int err;
+
+ emc->timings = devm_kcalloc(emc->dev, child_count, sizeof(*timing),
+ GFP_KERNEL);
+ if (!emc->timings)
+ return -ENOMEM;
+
+ emc->num_timings = child_count;
+
+ for_each_child_of_node_scoped(node, child) {
+ timing = &emc->timings[i++];
+
+ err = load_one_timing_from_dt(emc, timing, child);
+ if (err)
+ return err;
+ }
+
+ sort(emc->timings, emc->num_timings, sizeof(*timing), cmp_timings,
+ NULL);
+
+ err = emc_check_mc_timings(emc);
+ if (err)
+ return err;
+
+ dev_info_once(emc->dev,
+ "got %u timings for RAM code %u (min %luMHz max %luMHz)\n",
+ emc->num_timings,
+ tegra_read_ram_code(),
+ emc->timings[0].rate / 1000000,
+ emc->timings[emc->num_timings - 1].rate / 1000000);
+
+ return 0;
+}
+
+static struct device_node *
+tegra_emc_find_node_by_ram_code(struct device_node *node, u32 ram_code)
+{
+ struct device_node *np;
+ int err;
+
+ for_each_child_of_node(node, np) {
+ u32 value;
+
+ err = of_property_read_u32(np, "nvidia,ram-code", &value);
+ if (err || value != ram_code)
+ continue;
+
+ return np;
+ }
+
+ return NULL;
+}
+
+static void tegra_emc_rate_requests_init(struct tegra_emc *emc)
+{
+ unsigned int i;
+
+ for (i = 0; i < EMC_RATE_TYPE_MAX; i++) {
+ emc->requested_rate[i].min_rate = 0;
+ emc->requested_rate[i].max_rate = ULONG_MAX;
+ }
+}
+
+static int emc_request_rate(struct tegra_emc *emc,
+ unsigned long new_min_rate,
+ unsigned long new_max_rate,
+ enum emc_rate_request_type type)
+{
+ struct emc_rate_request *req = emc->requested_rate;
+ unsigned long min_rate = 0, max_rate = ULONG_MAX;
+ unsigned int i;
+ int err;
+
+ /* select minimum and maximum rates among the requested rates */
+ for (i = 0; i < EMC_RATE_TYPE_MAX; i++, req++) {
+ if (i == type) {
+ min_rate = max(new_min_rate, min_rate);
+ max_rate = min(new_max_rate, max_rate);
+ } else {
+ min_rate = max(req->min_rate, min_rate);
+ max_rate = min(req->max_rate, max_rate);
+ }
+ }
+
+ if (min_rate > max_rate) {
+ dev_err_ratelimited(emc->dev, "%s: type %u: out of range: %lu %lu\n",
+ __func__, type, min_rate, max_rate);
+ return -ERANGE;
+ }
+
+ /*
+ * EMC rate-changes should go via OPP API because it manages voltage
+ * changes.
+ */
+ err = dev_pm_opp_set_rate(emc->dev, min_rate);
+ if (err)
+ return err;
+
+ emc->requested_rate[type].min_rate = new_min_rate;
+ emc->requested_rate[type].max_rate = new_max_rate;
+
+ return 0;
+}
+
+static int emc_set_min_rate(struct tegra_emc *emc, unsigned long rate,
+ enum emc_rate_request_type type)
+{
+ struct emc_rate_request *req = &emc->requested_rate[type];
+ int ret;
+
+ mutex_lock(&emc->rate_lock);
+ ret = emc_request_rate(emc, rate, req->max_rate, type);
+ mutex_unlock(&emc->rate_lock);
+
+ return ret;
+}
+
+static int emc_set_max_rate(struct tegra_emc *emc, unsigned long rate,
+ enum emc_rate_request_type type)
+{
+ struct emc_rate_request *req = &emc->requested_rate[type];
+ int ret;
+
+ mutex_lock(&emc->rate_lock);
+ ret = emc_request_rate(emc, req->min_rate, rate, type);
+ mutex_unlock(&emc->rate_lock);
+
+ return ret;
+}
+
+/*
+ * debugfs interface
+ *
+ * The memory controller driver exposes some files in debugfs that can be used
+ * to control the EMC frequency. The top-level directory can be found here:
+ *
+ * /sys/kernel/debug/emc
+ *
+ * It contains the following files:
+ *
+ * - available_rates: This file contains a list of valid, space-separated
+ * EMC frequencies.
+ *
+ * - min_rate: Writing a value to this file sets the given frequency as the
+ * floor of the permitted range. If this is higher than the currently
+ * configured EMC frequency, this will cause the frequency to be
+ * increased so that it stays within the valid range.
+ *
+ * - max_rate: Similarily to the min_rate file, writing a value to this file
+ * sets the given frequency as the ceiling of the permitted range. If
+ * the value is lower than the currently configured EMC frequency, this
+ * will cause the frequency to be decreased so that it stays within the
+ * valid range.
+ */
+
+static bool tegra_emc_validate_rate(struct tegra_emc *emc, unsigned long rate)
+{
+ unsigned int i;
+
+ for (i = 0; i < emc->num_timings; i++)
+ if (rate == emc->timings[i].rate)
+ return true;
+
+ return false;
+}
+
+static int tegra_emc_debug_available_rates_show(struct seq_file *s,
+ void *data)
+{
+ struct tegra_emc *emc = s->private;
+ const char *prefix = "";
+ unsigned int i;
+
+ for (i = 0; i < emc->num_timings; i++) {
+ seq_printf(s, "%s%lu", prefix, emc->timings[i].rate);
+ prefix = " ";
+ }
+
+ seq_puts(s, "\n");
+
+ return 0;
+}
+
+DEFINE_SHOW_ATTRIBUTE(tegra_emc_debug_available_rates);
+
+static int tegra_emc_debug_min_rate_get(void *data, u64 *rate)
+{
+ struct tegra_emc *emc = data;
+
+ *rate = emc->debugfs.min_rate;
+
+ return 0;
+}
+
+static int tegra_emc_debug_min_rate_set(void *data, u64 rate)
+{
+ struct tegra_emc *emc = data;
+ int err;
+
+ if (!tegra_emc_validate_rate(emc, rate))
+ return -EINVAL;
+
+ err = emc_set_min_rate(emc, rate, EMC_RATE_DEBUG);
+ if (err < 0)
+ return err;
+
+ emc->debugfs.min_rate = rate;
+
+ return 0;
+}
+
+DEFINE_DEBUGFS_ATTRIBUTE(tegra_emc_debug_min_rate_fops,
+ tegra_emc_debug_min_rate_get,
+ tegra_emc_debug_min_rate_set, "%llu\n");
+
+static int tegra_emc_debug_max_rate_get(void *data, u64 *rate)
+{
+ struct tegra_emc *emc = data;
+
+ *rate = emc->debugfs.max_rate;
+
+ return 0;
+}
+
+static int tegra_emc_debug_max_rate_set(void *data, u64 rate)
+{
+ struct tegra_emc *emc = data;
+ int err;
+
+ if (!tegra_emc_validate_rate(emc, rate))
+ return -EINVAL;
+
+ err = emc_set_max_rate(emc, rate, EMC_RATE_DEBUG);
+ if (err < 0)
+ return err;
+
+ emc->debugfs.max_rate = rate;
+
+ return 0;
+}
+
+DEFINE_DEBUGFS_ATTRIBUTE(tegra_emc_debug_max_rate_fops,
+ tegra_emc_debug_max_rate_get,
+ tegra_emc_debug_max_rate_set, "%llu\n");
+
+static void emc_debugfs_init(struct device *dev, struct tegra_emc *emc)
+{
+ unsigned int i;
+ int err;
+
+ emc->debugfs.min_rate = ULONG_MAX;
+ emc->debugfs.max_rate = 0;
+
+ for (i = 0; i < emc->num_timings; i++) {
+ if (emc->timings[i].rate < emc->debugfs.min_rate)
+ emc->debugfs.min_rate = emc->timings[i].rate;
+
+ if (emc->timings[i].rate > emc->debugfs.max_rate)
+ emc->debugfs.max_rate = emc->timings[i].rate;
+ }
+
+ if (!emc->num_timings) {
+ emc->debugfs.min_rate = clk_get_rate(emc->clk);
+ emc->debugfs.max_rate = emc->debugfs.min_rate;
+ }
+
+ err = clk_set_rate_range(emc->clk, emc->debugfs.min_rate,
+ emc->debugfs.max_rate);
+ if (err < 0) {
+ dev_err(dev, "failed to set rate range [%lu-%lu] for %pC\n",
+ emc->debugfs.min_rate, emc->debugfs.max_rate,
+ emc->clk);
+ return;
+ }
+
+ emc->debugfs.root = debugfs_create_dir("emc", NULL);
+
+ debugfs_create_file("available_rates", 0444, emc->debugfs.root, emc,
+ &tegra_emc_debug_available_rates_fops);
+ debugfs_create_file("min_rate", 0644, emc->debugfs.root,
+ emc, &tegra_emc_debug_min_rate_fops);
+ debugfs_create_file("max_rate", 0644, emc->debugfs.root,
+ emc, &tegra_emc_debug_max_rate_fops);
+}
+
+static inline struct tegra_emc *
+to_tegra_emc_provider(struct icc_provider *provider)
+{
+ return container_of(provider, struct tegra_emc, provider);
+}
+
+static struct icc_node_data *
+emc_of_icc_xlate_extended(const struct of_phandle_args *spec, void *data)
+{
+ struct icc_provider *provider = data;
+ struct icc_node_data *ndata;
+ struct icc_node *node;
+
+ /* External Memory is the only possible ICC route */
+ list_for_each_entry(node, &provider->nodes, node_list) {
+ if (node->id != TEGRA_ICC_EMEM)
+ continue;
+
+ ndata = kzalloc(sizeof(*ndata), GFP_KERNEL);
+ if (!ndata)
+ return ERR_PTR(-ENOMEM);
+
+ /*
+ * SRC and DST nodes should have matching TAG in order to have
+ * it set by default for a requested path.
+ */
+ ndata->tag = TEGRA_MC_ICC_TAG_ISO;
+ ndata->node = node;
+
+ return ndata;
+ }
+
+ return ERR_PTR(-EPROBE_DEFER);
+}
+
+static int emc_icc_set(struct icc_node *src, struct icc_node *dst)
+{
+ struct tegra_emc *emc = to_tegra_emc_provider(dst->provider);
+ unsigned long long peak_bw = icc_units_to_bps(dst->peak_bw);
+ unsigned long long avg_bw = icc_units_to_bps(dst->avg_bw);
+ unsigned long long rate = max(avg_bw, peak_bw);
+ unsigned int dram_data_bus_width_bytes = 4;
+ const unsigned int ddr = 2;
+ int err;
+
+ /*
+ * Tegra114 EMC runs on a clock rate of SDRAM bus. This means that
+ * EMC clock rate is twice smaller than the peak data rate because
+ * data is sampled on both EMC clock edges.
+ */
+ do_div(rate, ddr * dram_data_bus_width_bytes);
+ rate = min_t(u64, rate, U32_MAX);
+
+ err = emc_set_min_rate(emc, rate, EMC_RATE_ICC);
+ if (err)
+ return err;
+
+ return 0;
+}
+
+static int tegra_emc_interconnect_init(struct tegra_emc *emc)
+{
+ const struct tegra_mc_soc *soc = emc->mc->soc;
+ struct icc_node *node;
+ int err;
+
+ emc->provider.dev = emc->dev;
+ emc->provider.set = emc_icc_set;
+ emc->provider.data = &emc->provider;
+ emc->provider.aggregate = soc->icc_ops->aggregate;
+ emc->provider.xlate_extended = emc_of_icc_xlate_extended;
+
+ icc_provider_init(&emc->provider);
+
+ /* create External Memory Controller node */
+ node = icc_node_create(TEGRA_ICC_EMC);
+ if (IS_ERR(node)) {
+ err = PTR_ERR(node);
+ goto err_msg;
+ }
+
+ node->name = "External Memory Controller";
+ icc_node_add(node, &emc->provider);
+
+ /* link External Memory Controller to External Memory (DRAM) */
+ err = icc_link_create(node, TEGRA_ICC_EMEM);
+ if (err)
+ goto remove_nodes;
+
+ /* create External Memory node */
+ node = icc_node_create(TEGRA_ICC_EMEM);
+ if (IS_ERR(node)) {
+ err = PTR_ERR(node);
+ goto remove_nodes;
+ }
+
+ node->name = "External Memory (DRAM)";
+ icc_node_add(node, &emc->provider);
+
+ err = icc_provider_register(&emc->provider);
+ if (err)
+ goto remove_nodes;
+
+ return 0;
+
+remove_nodes:
+ icc_nodes_remove(&emc->provider);
+err_msg:
+ dev_err(emc->dev, "failed to initialize ICC: %d\n", err);
+
+ return err;
+}
+
+static void devm_tegra_emc_unset_callback(void *data)
+{
+ tegra124_clk_set_emc_callbacks(NULL, NULL);
+}
+
+static int tegra_emc_probe(struct platform_device *pdev)
+{
+ struct tegra_core_opp_params opp_params = {};
+ struct device_node *np;
+ struct tegra_emc *emc;
+ u32 ram_code;
+ int err;
+
+ emc = devm_kzalloc(&pdev->dev, sizeof(*emc), GFP_KERNEL);
+ if (!emc)
+ return -ENOMEM;
+
+ mutex_init(&emc->rate_lock);
+ emc->dev = &pdev->dev;
+
+ emc->regs = devm_platform_ioremap_resource(pdev, 0);
+ if (IS_ERR(emc->regs))
+ return PTR_ERR(emc->regs);
+
+ emc->mc = devm_tegra_memory_controller_get(&pdev->dev);
+ if (IS_ERR(emc->mc))
+ return PTR_ERR(emc->mc);
+
+ ram_code = tegra_read_ram_code();
+
+ np = tegra_emc_find_node_by_ram_code(pdev->dev.of_node, ram_code);
+ if (np) {
+ err = tegra_emc_load_timings_from_dt(emc, np);
+ of_node_put(np);
+ if (err)
+ return err;
+ } else {
+ dev_info_once(&pdev->dev,
+ "no memory timings for RAM code %u found in DT\n",
+ ram_code);
+ }
+
+ err = emc_init(emc);
+ if (err) {
+ dev_err(&pdev->dev, "EMC initialization failed: %d\n", err);
+ return err;
+ }
+
+ platform_set_drvdata(pdev, emc);
+
+ tegra124_clk_set_emc_callbacks(tegra_emc_prepare_timing_change,
+ tegra_emc_complete_timing_change);
+
+ err = devm_add_action_or_reset(&pdev->dev, devm_tegra_emc_unset_callback,
+ NULL);
+ if (err)
+ return err;
+
+ err = platform_get_irq(pdev, 0);
+ if (err < 0)
+ return err;
+
+ emc->irq = err;
+
+ err = devm_request_irq(&pdev->dev, emc->irq, tegra_emc_isr, 0,
+ dev_name(&pdev->dev), emc);
+ if (err) {
+ dev_err(&pdev->dev, "failed to request irq: %d\n", err);
+ return err;
+ }
+
+ emc->clk = devm_clk_get(&pdev->dev, "emc");
+ if (IS_ERR(emc->clk)) {
+ err = PTR_ERR(emc->clk);
+ dev_err(&pdev->dev, "failed to get EMC clock: %d\n", err);
+ return err;
+ }
+
+ opp_params.init_state = true;
+
+ err = devm_tegra_core_dev_init_opp_table(&pdev->dev, &opp_params);
+ if (err)
+ return err;
+
+ tegra_emc_rate_requests_init(emc);
+
+ if (IS_ENABLED(CONFIG_DEBUG_FS))
+ emc_debugfs_init(&pdev->dev, emc);
+
+ tegra_emc_interconnect_init(emc);
+
+ /*
+ * Don't allow the kernel module to be unloaded. Unloading adds some
+ * extra complexity which doesn't really worth the effort in a case of
+ * this driver.
+ */
+ try_module_get(THIS_MODULE);
+
+ return 0;
+};
+
+static const struct of_device_id tegra_emc_of_match[] = {
+ { .compatible = "nvidia,tegra114-emc" },
+ {}
+};
+MODULE_DEVICE_TABLE(of, tegra_emc_of_match);
+
+static struct platform_driver tegra_emc_driver = {
+ .probe = tegra_emc_probe,
+ .driver = {
+ .name = "tegra114-emc",
+ .of_match_table = tegra_emc_of_match,
+ .suppress_bind_attrs = true,
+ .sync_state = icc_sync_state,
+ },
+};
+module_platform_driver(tegra_emc_driver);
+
+MODULE_AUTHOR("Svyatoslav Ryhel <clamor95@gmail.com>");
+MODULE_DESCRIPTION("NVIDIA Tegra114 EMC driver");
+MODULE_LICENSE("GPL");
--
2.51.0
^ permalink raw reply related [flat|nested] 18+ messages in thread
* Re: [PATCH v1 5/5] memory: tegra: Add Tegra114 EMC driver
2026-01-26 19:07 ` [PATCH v1 5/5] memory: tegra: Add Tegra114 EMC driver Svyatoslav Ryhel
@ 2026-02-17 7:21 ` Krzysztof Kozlowski
2026-02-17 7:51 ` Svyatoslav Ryhel
0 siblings, 1 reply; 18+ messages in thread
From: Krzysztof Kozlowski @ 2026-02-17 7:21 UTC (permalink / raw)
To: Svyatoslav Ryhel, Rob Herring, Conor Dooley, Thierry Reding,
Jonathan Hunter, Mikko Perttunen, Sumit Gupta, Dmitry Osipenko
Cc: linux-kernel, devicetree, linux-tegra
On 26/01/2026 20:07, Svyatoslav Ryhel wrote:
> Introduce driver for the External Memory Controller (EMC) found in
> Tegra114 SoC. It controls the external DRAM on the board. The purpose of
> this driver is to program memory timing for external memory on the EMC
> clock rate change.
>
> Signed-off-by: Svyatoslav Ryhel <clamor95@gmail.com>
> Reviewed-by: Mikko Perttunen <mperttunen@nvidia.com>
> ---
> drivers/memory/tegra/Kconfig | 12 +
> drivers/memory/tegra/Makefile | 1 +
> drivers/memory/tegra/tegra114-emc.c | 1463 +++++++++++++++++++++++++++
Please rebase on top of Mikko's patch removing duplicated code.
> 3 files changed, 1476 insertions(+)
> create mode 100644 drivers/memory/tegra/tegra114-emc.c
>
> diff --git a/drivers/memory/tegra/Kconfig b/drivers/memory/tegra/Kconfig
> index fc5a27791826..11e7cc357d39 100644
> --- a/drivers/memory/tegra/Kconfig
> +++ b/drivers/memory/tegra/Kconfig
> @@ -35,6 +35,18 @@ config TEGRA30_EMC
> This driver is required to change memory timings / clock rate for
> external memory.
>
> +config TEGRA114_EMC
> + tristate "NVIDIA Tegra114 External Memory Controller driver"
> + default y
> + depends on ARCH_TEGRA_114_SOC || COMPILE_TEST
> + select TEGRA124_CLK_EMC if ARCH_TEGRA
> + select PM_OPP
> + help
> + This driver is for the External Memory Controller (EMC) found on
> + Tegra114 chips. The EMC controls the external DRAM on the board.
> + This driver is required to change memory timings / clock rate for
> + external memory.
> +
> config TEGRA124_EMC
> tristate "NVIDIA Tegra124 External Memory Controller driver"
> default ARCH_TEGRA_124_SOC
> diff --git a/drivers/memory/tegra/Makefile b/drivers/memory/tegra/Makefile
> index 6334601e6120..6b9156de4b66 100644
> --- a/drivers/memory/tegra/Makefile
> +++ b/drivers/memory/tegra/Makefile
> @@ -16,6 +16,7 @@ obj-$(CONFIG_TEGRA_MC) += tegra-mc.o
>
> obj-$(CONFIG_TEGRA20_EMC) += tegra20-emc.o
> obj-$(CONFIG_TEGRA30_EMC) += tegra30-emc.o
> +obj-$(CONFIG_TEGRA114_EMC) += tegra114-emc.o
> obj-$(CONFIG_TEGRA124_EMC) += tegra124-emc.o
> obj-$(CONFIG_TEGRA210_EMC_TABLE) += tegra210-emc-table.o
> obj-$(CONFIG_TEGRA210_EMC) += tegra210-emc.o
> diff --git a/drivers/memory/tegra/tegra114-emc.c b/drivers/memory/tegra/tegra114-emc.c
> new file mode 100644
> index 000000000000..789b8e959a68
> --- /dev/null
> +++ b/drivers/memory/tegra/tegra114-emc.c
> @@ -0,0 +1,1463 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +/*
> + * Tegra114 External Memory Controller driver
> + *
> + * Based on downstream driver from NVIDIA and tegra124-emc.c
> + * Copyright (C) 2011-2014 NVIDIA Corporation
> + *
> + * Copyright (C) 2024 Svyatoslav Ryhel <clamor95@gmail.com>
> + */
> +
> +#include <linux/clk-provider.h>
Where is it used?
> +#include <linux/clk.h>
> +#include <linux/clkdev.h>
Where is it used?
> +#include <linux/clk/tegra.h>
Where is it used?
> +#include <linux/debugfs.h>
> +#include <linux/delay.h>
> +#include <linux/interconnect-provider.h>
Where is it used?
> +#include <linux/interrupt.h>
> +#include <linux/io.h>
> +#include <linux/iopoll.h>
> +#include <linux/module.h>
> +#include <linux/mutex.h>
> +#include <linux/of_address.h>
> +#include <linux/of_platform.h>
I don't see these used. OTOH, I see you use other of_ which needs their
header.
> +#include <linux/platform_device.h>
> +#include <linux/pm_opp.h>
> +#include <linux/sort.h>
> +#include <linux/string.h>
> +
> +#include <soc/tegra/common.h>
> +#include <soc/tegra/fuse.h>
> +#include <soc/tegra/mc.h>
> +
> +#include "mc.h"
> +
> +#define EMC_INTSTATUS 0x0
> +#define EMC_INTSTATUS_REFRESH_OVERFLOW BIT(3)
> +#define EMC_INTSTATUS_CLKCHANGE_COMPLETE BIT(4)
> +
> +#define EMC_INTMASK 0x4
> +
> +#define EMC_DBG 0x8
> +#define EMC_DBG_READ_MUX_ASSEMBLY BIT(0)
> +#define EMC_DBG_WRITE_MUX_ACTIVE BIT(1)
> +#define EMC_DBG_FORCE_UPDATE BIT(2)
> +#define EMC_DBG_CFG_PRIORITY BIT(24)
> +
...
> +
> +static int tegra_emc_debug_available_rates_show(struct seq_file *s,
> + void *data)
> +{
> + struct tegra_emc *emc = s->private;
> + const char *prefix = "";
> + unsigned int i;
> +
> + for (i = 0; i < emc->num_timings; i++) {
> + seq_printf(s, "%s%lu", prefix, emc->timings[i].rate);
> + prefix = " ";
> + }
> +
> + seq_puts(s, "\n");
> +
> + return 0;
> +}
> +
> +DEFINE_SHOW_ATTRIBUTE(tegra_emc_debug_available_rates);
Where is the ABI documented for all these?
> +
> +static int tegra_emc_debug_min_rate_get(void *data, u64 *rate)
> +{
> + struct tegra_emc *emc = data;
> +
> + *rate = emc->debugfs.min_rate;
> +
> + return 0;
> +}
> +
> +static int tegra_emc_debug_min_rate_set(void *data, u64 rate)
> +{
> + struct tegra_emc *emc = data;
> + int err;
> +
> + if (!tegra_emc_validate_rate(emc, rate))
> + return -EINVAL;
> +
> + err = emc_set_min_rate(emc, rate, EMC_RATE_DEBUG);
> + if (err < 0)
> + return err;
> +
> + emc->debugfs.min_rate = rate;
> +
> + return 0;
> +}
> +
> +DEFINE_DEBUGFS_ATTRIBUTE(tegra_emc_debug_min_rate_fops,
> + tegra_emc_debug_min_rate_get,
> + tegra_emc_debug_min_rate_set, "%llu\n");
> +
...
> +
> +static int tegra_emc_probe(struct platform_device *pdev)
> +{
> + struct tegra_core_opp_params opp_params = {};
> + struct device_node *np;
> + struct tegra_emc *emc;
> + u32 ram_code;
> + int err;
> +
> + emc = devm_kzalloc(&pdev->dev, sizeof(*emc), GFP_KERNEL);
> + if (!emc)
> + return -ENOMEM;
> +
> + mutex_init(&emc->rate_lock);
> + emc->dev = &pdev->dev;
> +
> + emc->regs = devm_platform_ioremap_resource(pdev, 0);
> + if (IS_ERR(emc->regs))
> + return PTR_ERR(emc->regs);
> +
> + emc->mc = devm_tegra_memory_controller_get(&pdev->dev);
> + if (IS_ERR(emc->mc))
> + return PTR_ERR(emc->mc);
> +
> + ram_code = tegra_read_ram_code();
> +
> + np = tegra_emc_find_node_by_ram_code(pdev->dev.of_node, ram_code);
> + if (np) {
> + err = tegra_emc_load_timings_from_dt(emc, np);
> + of_node_put(np);
> + if (err)
> + return err;
> + } else {
> + dev_info_once(&pdev->dev,
> + "no memory timings for RAM code %u found in DT\n",
> + ram_code);
> + }
> +
> + err = emc_init(emc);
> + if (err) {
> + dev_err(&pdev->dev, "EMC initialization failed: %d\n", err);
> + return err;
> + }
> +
> + platform_set_drvdata(pdev, emc);
> +
> + tegra124_clk_set_emc_callbacks(tegra_emc_prepare_timing_change,
> + tegra_emc_complete_timing_change);
> +
> + err = devm_add_action_or_reset(&pdev->dev, devm_tegra_emc_unset_callback,
> + NULL);
> + if (err)
> + return err;
> +
> + err = platform_get_irq(pdev, 0);
> + if (err < 0)
> + return err;
> +
> + emc->irq = err;
> +
> + err = devm_request_irq(&pdev->dev, emc->irq, tegra_emc_isr, 0,
> + dev_name(&pdev->dev), emc);
> + if (err) {
> + dev_err(&pdev->dev, "failed to request irq: %d\n", err);
> + return err;
> + }
> +
> + emc->clk = devm_clk_get(&pdev->dev, "emc");
> + if (IS_ERR(emc->clk)) {
> + err = PTR_ERR(emc->clk);
> + dev_err(&pdev->dev, "failed to get EMC clock: %d\n", err);
Syntax is return dev_err_probe. Since some years and all the existing
code was already fixed, no?
> + return err;
> + }
> +
> + opp_params.init_state = true;
> +
> + err = devm_tegra_core_dev_init_opp_table(&pdev->dev, &opp_params);
> + if (err)
> + return err;
> +
> + tegra_emc_rate_requests_init(emc);
> +
> + if (IS_ENABLED(CONFIG_DEBUG_FS))
> + emc_debugfs_init(&pdev->dev, emc);
> +
> + tegra_emc_interconnect_init(emc);
> +
> + /*
> + * Don't allow the kernel module to be unloaded. Unloading adds some
> + * extra complexity which doesn't really worth the effort in a case of
> + * this driver.
> + */
> + try_module_get(THIS_MODULE);
> +
> + return 0;
> +};
> +
> +static const struct of_device_id tegra_emc_of_match[] = {
> + { .compatible = "nvidia,tegra114-emc" },
> + {}
> +};
> +MODULE_DEVICE_TABLE(of, tegra_emc_of_match);
> +
> +static struct platform_driver tegra_emc_driver = {
> + .probe = tegra_emc_probe,
> + .driver = {
> + .name = "tegra114-emc",
> + .of_match_table = tegra_emc_of_match,
> + .suppress_bind_attrs = true,
> + .sync_state = icc_sync_state,
> + },
> +};
> +module_platform_driver(tegra_emc_driver);
> +
> +MODULE_AUTHOR("Svyatoslav Ryhel <clamor95@gmail.com>");
> +MODULE_DESCRIPTION("NVIDIA Tegra114 EMC driver");
> +MODULE_LICENSE("GPL");
Best regards,
Krzysztof
^ permalink raw reply [flat|nested] 18+ messages in thread
* Re: [PATCH v1 3/5] dt-bindings: memory: Add Tegra114 memory client IDs
2026-01-26 19:07 ` [PATCH v1 3/5] dt-bindings: memory: Add Tegra114 memory client IDs Svyatoslav Ryhel
@ 2026-02-17 7:22 ` Krzysztof Kozlowski
2026-02-17 8:02 ` Svyatoslav Ryhel
2026-03-27 23:53 ` Thierry Reding
0 siblings, 2 replies; 18+ messages in thread
From: Krzysztof Kozlowski @ 2026-02-17 7:22 UTC (permalink / raw)
To: Svyatoslav Ryhel, Rob Herring, Conor Dooley, Thierry Reding,
Jonathan Hunter, Mikko Perttunen, Sumit Gupta, Dmitry Osipenko
Cc: linux-kernel, devicetree, linux-tegra
On 26/01/2026 20:07, Svyatoslav Ryhel wrote:
> Each memory client has unique hardware ID, add these IDs.
>
> Signed-off-by: Svyatoslav Ryhel <clamor95@gmail.com>
> Acked-by: Rob Herring (Arm) <robh@kernel.org>
> Reviewed-by: Mikko Perttunen <mperttunen@nvidia.com>
> ---
> include/dt-bindings/memory/tegra114-mc.h | 67 ++++++++++++++++++++++++
This is never a separate commit. Squash with the binding.
Best regards,
Krzysztof
^ permalink raw reply [flat|nested] 18+ messages in thread
* Re: [PATCH v1 5/5] memory: tegra: Add Tegra114 EMC driver
2026-02-17 7:21 ` Krzysztof Kozlowski
@ 2026-02-17 7:51 ` Svyatoslav Ryhel
2026-02-17 8:18 ` Krzysztof Kozlowski
0 siblings, 1 reply; 18+ messages in thread
From: Svyatoslav Ryhel @ 2026-02-17 7:51 UTC (permalink / raw)
To: Krzysztof Kozlowski
Cc: Rob Herring, Conor Dooley, Thierry Reding, Jonathan Hunter,
Mikko Perttunen, Sumit Gupta, Dmitry Osipenko, linux-kernel,
devicetree, linux-tegra
вт, 17 лют. 2026 р. о 09:21 Krzysztof Kozlowski <krzk@kernel.org> пише:
>
> On 26/01/2026 20:07, Svyatoslav Ryhel wrote:
> > Introduce driver for the External Memory Controller (EMC) found in
> > Tegra114 SoC. It controls the external DRAM on the board. The purpose of
> > this driver is to program memory timing for external memory on the EMC
> > clock rate change.
> >
> > Signed-off-by: Svyatoslav Ryhel <clamor95@gmail.com>
> > Reviewed-by: Mikko Perttunen <mperttunen@nvidia.com>
> > ---
> > drivers/memory/tegra/Kconfig | 12 +
> > drivers/memory/tegra/Makefile | 1 +
> > drivers/memory/tegra/tegra114-emc.c | 1463 +++++++++++++++++++++++++++
>
> Please rebase on top of Mikko's patch removing duplicated code.
>
> > 3 files changed, 1476 insertions(+)
> > create mode 100644 drivers/memory/tegra/tegra114-emc.c
> >
> > diff --git a/drivers/memory/tegra/Kconfig b/drivers/memory/tegra/Kconfig
> > index fc5a27791826..11e7cc357d39 100644
> > --- a/drivers/memory/tegra/Kconfig
> > +++ b/drivers/memory/tegra/Kconfig
> > @@ -35,6 +35,18 @@ config TEGRA30_EMC
> > This driver is required to change memory timings / clock rate for
> > external memory.
> >
> > +config TEGRA114_EMC
> > + tristate "NVIDIA Tegra114 External Memory Controller driver"
> > + default y
> > + depends on ARCH_TEGRA_114_SOC || COMPILE_TEST
> > + select TEGRA124_CLK_EMC if ARCH_TEGRA
> > + select PM_OPP
> > + help
> > + This driver is for the External Memory Controller (EMC) found on
> > + Tegra114 chips. The EMC controls the external DRAM on the board.
> > + This driver is required to change memory timings / clock rate for
> > + external memory.
> > +
> > config TEGRA124_EMC
> > tristate "NVIDIA Tegra124 External Memory Controller driver"
> > default ARCH_TEGRA_124_SOC
> > diff --git a/drivers/memory/tegra/Makefile b/drivers/memory/tegra/Makefile
> > index 6334601e6120..6b9156de4b66 100644
> > --- a/drivers/memory/tegra/Makefile
> > +++ b/drivers/memory/tegra/Makefile
> > @@ -16,6 +16,7 @@ obj-$(CONFIG_TEGRA_MC) += tegra-mc.o
> >
> > obj-$(CONFIG_TEGRA20_EMC) += tegra20-emc.o
> > obj-$(CONFIG_TEGRA30_EMC) += tegra30-emc.o
> > +obj-$(CONFIG_TEGRA114_EMC) += tegra114-emc.o
> > obj-$(CONFIG_TEGRA124_EMC) += tegra124-emc.o
> > obj-$(CONFIG_TEGRA210_EMC_TABLE) += tegra210-emc-table.o
> > obj-$(CONFIG_TEGRA210_EMC) += tegra210-emc.o
> > diff --git a/drivers/memory/tegra/tegra114-emc.c b/drivers/memory/tegra/tegra114-emc.c
> > new file mode 100644
> > index 000000000000..789b8e959a68
> > --- /dev/null
> > +++ b/drivers/memory/tegra/tegra114-emc.c
> > @@ -0,0 +1,1463 @@
> > +// SPDX-License-Identifier: GPL-2.0-only
> > +/*
> > + * Tegra114 External Memory Controller driver
> > + *
> > + * Based on downstream driver from NVIDIA and tegra124-emc.c
> > + * Copyright (C) 2011-2014 NVIDIA Corporation
> > + *
> > + * Copyright (C) 2024 Svyatoslav Ryhel <clamor95@gmail.com>
> > + */
> > +
> > +#include <linux/clk-provider.h>
>
> Where is it used?
>
> > +#include <linux/clk.h>
> > +#include <linux/clkdev.h>
>
> Where is it used?
>
> > +#include <linux/clk/tegra.h>
>
> Where is it used?
>
All 4 by tegra124_clk_set_emc_callbacks
> > +#include <linux/debugfs.h>
> > +#include <linux/delay.h>
> > +#include <linux/interconnect-provider.h>
>
> Where is it used?
>
tegra_emc_interconnect_init
> > +#include <linux/interrupt.h>
> > +#include <linux/io.h>
> > +#include <linux/iopoll.h>
> > +#include <linux/module.h>
> > +#include <linux/mutex.h>
> > +#include <linux/of_address.h>
> > +#include <linux/of_platform.h>
>
> I don't see these used. OTOH, I see you use other of_ which needs their
> header.
>
fair
> > +#include <linux/platform_device.h>
> > +#include <linux/pm_opp.h>
> > +#include <linux/sort.h>
> > +#include <linux/string.h>
> > +
> > +#include <soc/tegra/common.h>
> > +#include <soc/tegra/fuse.h>
> > +#include <soc/tegra/mc.h>
> > +
> > +#include "mc.h"
> > +
> > +#define EMC_INTSTATUS 0x0
> > +#define EMC_INTSTATUS_REFRESH_OVERFLOW BIT(3)
> > +#define EMC_INTSTATUS_CLKCHANGE_COMPLETE BIT(4)
> > +
> > +#define EMC_INTMASK 0x4
> > +
> > +#define EMC_DBG 0x8
> > +#define EMC_DBG_READ_MUX_ASSEMBLY BIT(0)
> > +#define EMC_DBG_WRITE_MUX_ACTIVE BIT(1)
> > +#define EMC_DBG_FORCE_UPDATE BIT(2)
> > +#define EMC_DBG_CFG_PRIORITY BIT(24)
> > +
>
> ...
>
> > +
> > +static int tegra_emc_debug_available_rates_show(struct seq_file *s,
> > + void *data)
> > +{
> > + struct tegra_emc *emc = s->private;
> > + const char *prefix = "";
> > + unsigned int i;
> > +
> > + for (i = 0; i < emc->num_timings; i++) {
> > + seq_printf(s, "%s%lu", prefix, emc->timings[i].rate);
> > + prefix = " ";
> > + }
> > +
> > + seq_puts(s, "\n");
> > +
> > + return 0;
> > +}
> > +
> > +DEFINE_SHOW_ATTRIBUTE(tegra_emc_debug_available_rates);
>
> Where is the ABI documented for all these?
>
Debugfs does not require ABI documentation, provided comment in the
driver is sufficient.
> > +
> > +static int tegra_emc_debug_min_rate_get(void *data, u64 *rate)
> > +{
> > + struct tegra_emc *emc = data;
> > +
> > + *rate = emc->debugfs.min_rate;
> > +
> > + return 0;
> > +}
> > +
> > +static int tegra_emc_debug_min_rate_set(void *data, u64 rate)
> > +{
> > + struct tegra_emc *emc = data;
> > + int err;
> > +
> > + if (!tegra_emc_validate_rate(emc, rate))
> > + return -EINVAL;
> > +
> > + err = emc_set_min_rate(emc, rate, EMC_RATE_DEBUG);
> > + if (err < 0)
> > + return err;
> > +
> > + emc->debugfs.min_rate = rate;
> > +
> > + return 0;
> > +}
> > +
> > +DEFINE_DEBUGFS_ATTRIBUTE(tegra_emc_debug_min_rate_fops,
> > + tegra_emc_debug_min_rate_get,
> > + tegra_emc_debug_min_rate_set, "%llu\n");
> > +
>
> ...
>
> > +
> > +static int tegra_emc_probe(struct platform_device *pdev)
> > +{
> > + struct tegra_core_opp_params opp_params = {};
> > + struct device_node *np;
> > + struct tegra_emc *emc;
> > + u32 ram_code;
> > + int err;
> > +
> > + emc = devm_kzalloc(&pdev->dev, sizeof(*emc), GFP_KERNEL);
> > + if (!emc)
> > + return -ENOMEM;
> > +
> > + mutex_init(&emc->rate_lock);
> > + emc->dev = &pdev->dev;
> > +
> > + emc->regs = devm_platform_ioremap_resource(pdev, 0);
> > + if (IS_ERR(emc->regs))
> > + return PTR_ERR(emc->regs);
> > +
> > + emc->mc = devm_tegra_memory_controller_get(&pdev->dev);
> > + if (IS_ERR(emc->mc))
> > + return PTR_ERR(emc->mc);
> > +
> > + ram_code = tegra_read_ram_code();
> > +
> > + np = tegra_emc_find_node_by_ram_code(pdev->dev.of_node, ram_code);
> > + if (np) {
> > + err = tegra_emc_load_timings_from_dt(emc, np);
> > + of_node_put(np);
> > + if (err)
> > + return err;
> > + } else {
> > + dev_info_once(&pdev->dev,
> > + "no memory timings for RAM code %u found in DT\n",
> > + ram_code);
> > + }
> > +
> > + err = emc_init(emc);
> > + if (err) {
> > + dev_err(&pdev->dev, "EMC initialization failed: %d\n", err);
> > + return err;
> > + }
> > +
> > + platform_set_drvdata(pdev, emc);
> > +
> > + tegra124_clk_set_emc_callbacks(tegra_emc_prepare_timing_change,
> > + tegra_emc_complete_timing_change);
> > +
> > + err = devm_add_action_or_reset(&pdev->dev, devm_tegra_emc_unset_callback,
> > + NULL);
> > + if (err)
> > + return err;
> > +
> > + err = platform_get_irq(pdev, 0);
> > + if (err < 0)
> > + return err;
> > +
> > + emc->irq = err;
> > +
> > + err = devm_request_irq(&pdev->dev, emc->irq, tegra_emc_isr, 0,
> > + dev_name(&pdev->dev), emc);
> > + if (err) {
> > + dev_err(&pdev->dev, "failed to request irq: %d\n", err);
> > + return err;
> > + }
> > +
> > + emc->clk = devm_clk_get(&pdev->dev, "emc");
> > + if (IS_ERR(emc->clk)) {
> > + err = PTR_ERR(emc->clk);
> > + dev_err(&pdev->dev, "failed to get EMC clock: %d\n", err);
>
> Syntax is return dev_err_probe. Since some years and all the existing
> code was already fixed, no?
>
fair
> > + return err;
> > + }
> > +
> > + opp_params.init_state = true;
> > +
> > + err = devm_tegra_core_dev_init_opp_table(&pdev->dev, &opp_params);
> > + if (err)
> > + return err;
> > +
> > + tegra_emc_rate_requests_init(emc);
> > +
> > + if (IS_ENABLED(CONFIG_DEBUG_FS))
> > + emc_debugfs_init(&pdev->dev, emc);
> > +
> > + tegra_emc_interconnect_init(emc);
> > +
> > + /*
> > + * Don't allow the kernel module to be unloaded. Unloading adds some
> > + * extra complexity which doesn't really worth the effort in a case of
> > + * this driver.
> > + */
> > + try_module_get(THIS_MODULE);
> > +
> > + return 0;
> > +};
> > +
> > +static const struct of_device_id tegra_emc_of_match[] = {
> > + { .compatible = "nvidia,tegra114-emc" },
> > + {}
> > +};
> > +MODULE_DEVICE_TABLE(of, tegra_emc_of_match);
> > +
> > +static struct platform_driver tegra_emc_driver = {
> > + .probe = tegra_emc_probe,
> > + .driver = {
> > + .name = "tegra114-emc",
> > + .of_match_table = tegra_emc_of_match,
> > + .suppress_bind_attrs = true,
> > + .sync_state = icc_sync_state,
> > + },
> > +};
> > +module_platform_driver(tegra_emc_driver);
> > +
> > +MODULE_AUTHOR("Svyatoslav Ryhel <clamor95@gmail.com>");
> > +MODULE_DESCRIPTION("NVIDIA Tegra114 EMC driver");
> > +MODULE_LICENSE("GPL");
>
>
> Best regards,
> Krzysztof
^ permalink raw reply [flat|nested] 18+ messages in thread
* Re: [PATCH v1 3/5] dt-bindings: memory: Add Tegra114 memory client IDs
2026-02-17 7:22 ` Krzysztof Kozlowski
@ 2026-02-17 8:02 ` Svyatoslav Ryhel
2026-02-17 8:15 ` Krzysztof Kozlowski
2026-03-27 23:53 ` Thierry Reding
1 sibling, 1 reply; 18+ messages in thread
From: Svyatoslav Ryhel @ 2026-02-17 8:02 UTC (permalink / raw)
To: Krzysztof Kozlowski
Cc: Rob Herring, Conor Dooley, Thierry Reding, Jonathan Hunter,
Mikko Perttunen, Sumit Gupta, Dmitry Osipenko, linux-kernel,
devicetree, linux-tegra
вт, 17 лют. 2026 р. о 09:22 Krzysztof Kozlowski <krzk@kernel.org> пише:
>
> On 26/01/2026 20:07, Svyatoslav Ryhel wrote:
> > Each memory client has unique hardware ID, add these IDs.
> >
> > Signed-off-by: Svyatoslav Ryhel <clamor95@gmail.com>
> > Acked-by: Rob Herring (Arm) <robh@kernel.org>
> > Reviewed-by: Mikko Perttunen <mperttunen@nvidia.com>
> > ---
> > include/dt-bindings/memory/tegra114-mc.h | 67 ++++++++++++++++++++++++
>
> This is never a separate commit. Squash with the binding.
>
Always was and now it suddenly is not? Maybe you should consider
fixing checkpatch since it complains that binding and header must be 2
separate commits.
> Best regards,
> Krzysztof
^ permalink raw reply [flat|nested] 18+ messages in thread
* Re: [PATCH v1 3/5] dt-bindings: memory: Add Tegra114 memory client IDs
2026-02-17 8:02 ` Svyatoslav Ryhel
@ 2026-02-17 8:15 ` Krzysztof Kozlowski
2026-02-17 8:24 ` Svyatoslav Ryhel
0 siblings, 1 reply; 18+ messages in thread
From: Krzysztof Kozlowski @ 2026-02-17 8:15 UTC (permalink / raw)
To: Svyatoslav Ryhel
Cc: Rob Herring, Conor Dooley, Thierry Reding, Jonathan Hunter,
Mikko Perttunen, Sumit Gupta, Dmitry Osipenko, linux-kernel,
devicetree, linux-tegra
On 17/02/2026 09:02, Svyatoslav Ryhel wrote:
> вт, 17 лют. 2026 р. о 09:22 Krzysztof Kozlowski <krzk@kernel.org> пише:
>>
>> On 26/01/2026 20:07, Svyatoslav Ryhel wrote:
>>> Each memory client has unique hardware ID, add these IDs.
>>>
>>> Signed-off-by: Svyatoslav Ryhel <clamor95@gmail.com>
>>> Acked-by: Rob Herring (Arm) <robh@kernel.org>
>>> Reviewed-by: Mikko Perttunen <mperttunen@nvidia.com>
>>> ---
>>> include/dt-bindings/memory/tegra114-mc.h | 67 ++++++++++++++++++++++++
>>
>> This is never a separate commit. Squash with the binding.
>>
>
> Always was and now it suddenly is not? Maybe you should consider
It never was, by the rules. I give this review all the time.
> fixing checkpatch since it complains that binding and header must be 2
> separate commits.
I considered, I guess many considered... but the problem is:
IT DOES NOT SAY THAT. There is no checkpatch warning, at least on recent
tree.
Best regards,
Krzysztof
^ permalink raw reply [flat|nested] 18+ messages in thread
* Re: [PATCH v1 5/5] memory: tegra: Add Tegra114 EMC driver
2026-02-17 7:51 ` Svyatoslav Ryhel
@ 2026-02-17 8:18 ` Krzysztof Kozlowski
2026-02-17 8:29 ` Svyatoslav Ryhel
0 siblings, 1 reply; 18+ messages in thread
From: Krzysztof Kozlowski @ 2026-02-17 8:18 UTC (permalink / raw)
To: Svyatoslav Ryhel
Cc: Rob Herring, Conor Dooley, Thierry Reding, Jonathan Hunter,
Mikko Perttunen, Sumit Gupta, Dmitry Osipenko, linux-kernel,
devicetree, linux-tegra
On 17/02/2026 08:51, Svyatoslav Ryhel wrote:
> вт, 17 лют. 2026 р. о 09:21 Krzysztof Kozlowski <krzk@kernel.org> пише:
>>
>> On 26/01/2026 20:07, Svyatoslav Ryhel wrote:
>>> Introduce driver for the External Memory Controller (EMC) found in
>>> Tegra114 SoC. It controls the external DRAM on the board. The purpose of
>>> this driver is to program memory timing for external memory on the EMC
>>> clock rate change.
>>>
>>> Signed-off-by: Svyatoslav Ryhel <clamor95@gmail.com>
>>> Reviewed-by: Mikko Perttunen <mperttunen@nvidia.com>
>>> ---
>>> drivers/memory/tegra/Kconfig | 12 +
>>> drivers/memory/tegra/Makefile | 1 +
>>> drivers/memory/tegra/tegra114-emc.c | 1463 +++++++++++++++++++++++++++
>>
>> Please rebase on top of Mikko's patch removing duplicated code.
>>
>>> 3 files changed, 1476 insertions(+)
>>> create mode 100644 drivers/memory/tegra/tegra114-emc.c
>>>
>>> diff --git a/drivers/memory/tegra/Kconfig b/drivers/memory/tegra/Kconfig
>>> index fc5a27791826..11e7cc357d39 100644
>>> --- a/drivers/memory/tegra/Kconfig
>>> +++ b/drivers/memory/tegra/Kconfig
>>> @@ -35,6 +35,18 @@ config TEGRA30_EMC
>>> This driver is required to change memory timings / clock rate for
>>> external memory.
>>>
>>> +config TEGRA114_EMC
>>> + tristate "NVIDIA Tegra114 External Memory Controller driver"
>>> + default y
>>> + depends on ARCH_TEGRA_114_SOC || COMPILE_TEST
>>> + select TEGRA124_CLK_EMC if ARCH_TEGRA
>>> + select PM_OPP
>>> + help
>>> + This driver is for the External Memory Controller (EMC) found on
>>> + Tegra114 chips. The EMC controls the external DRAM on the board.
>>> + This driver is required to change memory timings / clock rate for
>>> + external memory.
>>> +
>>> config TEGRA124_EMC
>>> tristate "NVIDIA Tegra124 External Memory Controller driver"
>>> default ARCH_TEGRA_124_SOC
>>> diff --git a/drivers/memory/tegra/Makefile b/drivers/memory/tegra/Makefile
>>> index 6334601e6120..6b9156de4b66 100644
>>> --- a/drivers/memory/tegra/Makefile
>>> +++ b/drivers/memory/tegra/Makefile
>>> @@ -16,6 +16,7 @@ obj-$(CONFIG_TEGRA_MC) += tegra-mc.o
>>>
>>> obj-$(CONFIG_TEGRA20_EMC) += tegra20-emc.o
>>> obj-$(CONFIG_TEGRA30_EMC) += tegra30-emc.o
>>> +obj-$(CONFIG_TEGRA114_EMC) += tegra114-emc.o
>>> obj-$(CONFIG_TEGRA124_EMC) += tegra124-emc.o
>>> obj-$(CONFIG_TEGRA210_EMC_TABLE) += tegra210-emc-table.o
>>> obj-$(CONFIG_TEGRA210_EMC) += tegra210-emc.o
>>> diff --git a/drivers/memory/tegra/tegra114-emc.c b/drivers/memory/tegra/tegra114-emc.c
>>> new file mode 100644
>>> index 000000000000..789b8e959a68
>>> --- /dev/null
>>> +++ b/drivers/memory/tegra/tegra114-emc.c
>>> @@ -0,0 +1,1463 @@
>>> +// SPDX-License-Identifier: GPL-2.0-only
>>> +/*
>>> + * Tegra114 External Memory Controller driver
>>> + *
>>> + * Based on downstream driver from NVIDIA and tegra124-emc.c
>>> + * Copyright (C) 2011-2014 NVIDIA Corporation
>>> + *
>>> + * Copyright (C) 2024 Svyatoslav Ryhel <clamor95@gmail.com>
>>> + */
>>> +
>>> +#include <linux/clk-provider.h>
>>
>> Where is it used?
>>
>>> +#include <linux/clk.h>
>>> +#include <linux/clkdev.h>
>>
>> Where is it used?
>>
>>> +#include <linux/clk/tegra.h>
>>
>> Where is it used?
>>
>
> All 4 by tegra124_clk_set_emc_callbacks
What? That's not how C works.
There is no definition of tegra124_clk_set_emc_callbacks here in this
patch, so the headers are not used. Point me to any symbols from these
headers being used in this patch.
Best regards,
Krzysztof
^ permalink raw reply [flat|nested] 18+ messages in thread
* Re: [PATCH v1 3/5] dt-bindings: memory: Add Tegra114 memory client IDs
2026-02-17 8:15 ` Krzysztof Kozlowski
@ 2026-02-17 8:24 ` Svyatoslav Ryhel
0 siblings, 0 replies; 18+ messages in thread
From: Svyatoslav Ryhel @ 2026-02-17 8:24 UTC (permalink / raw)
To: Krzysztof Kozlowski
Cc: Rob Herring, Conor Dooley, Thierry Reding, Jonathan Hunter,
Mikko Perttunen, Sumit Gupta, Dmitry Osipenko, linux-kernel,
devicetree, linux-tegra
вт, 17 лют. 2026 р. о 10:15 Krzysztof Kozlowski <krzk@kernel.org> пише:
>
> On 17/02/2026 09:02, Svyatoslav Ryhel wrote:
> > вт, 17 лют. 2026 р. о 09:22 Krzysztof Kozlowski <krzk@kernel.org> пише:
> >>
> >> On 26/01/2026 20:07, Svyatoslav Ryhel wrote:
> >>> Each memory client has unique hardware ID, add these IDs.
> >>>
> >>> Signed-off-by: Svyatoslav Ryhel <clamor95@gmail.com>
> >>> Acked-by: Rob Herring (Arm) <robh@kernel.org>
> >>> Reviewed-by: Mikko Perttunen <mperttunen@nvidia.com>
> >>> ---
> >>> include/dt-bindings/memory/tegra114-mc.h | 67 ++++++++++++++++++++++++
> >>
> >> This is never a separate commit. Squash with the binding.
> >>
> >
> > Always was and now it suddenly is not? Maybe you should consider
>
> It never was, by the rules. I give this review all the time.
>
https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/include/dt-bindings/memory?h=next-20260216&id=96b0239bbd6153b70c14c80664ebb43cd2ddacd9
https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/include/dt-bindings/memory?h=next-20260216&id=825c7f4aa2866b77c0238855e2f58d56d2f13eae
https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/include/dt-bindings/memory?h=next-20260216&id=f25696bce9604dbfd8d956da6023d18a05ec8ed3
https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/include/dt-bindings/memory?h=next-20260216&id=24a7eaea0a941c9e5e243ffb40073dcafecd3c11
I don't see any of these are squashed with any binding, but ok, whatever.
> > fixing checkpatch since it complains that binding and header must be 2
> > separate commits.
>
> I considered, I guess many considered... but the problem is:
>
> IT DOES NOT SAY THAT. There is no checkpatch warning, at least on recent
> tree.
>
Interesting, it is not now, but it definitely was. Acknowledged.
> Best regards,
> Krzysztof
^ permalink raw reply [flat|nested] 18+ messages in thread
* Re: [PATCH v1 5/5] memory: tegra: Add Tegra114 EMC driver
2026-02-17 8:18 ` Krzysztof Kozlowski
@ 2026-02-17 8:29 ` Svyatoslav Ryhel
2026-02-17 8:33 ` Krzysztof Kozlowski
0 siblings, 1 reply; 18+ messages in thread
From: Svyatoslav Ryhel @ 2026-02-17 8:29 UTC (permalink / raw)
To: Krzysztof Kozlowski
Cc: Rob Herring, Conor Dooley, Thierry Reding, Jonathan Hunter,
Mikko Perttunen, Sumit Gupta, Dmitry Osipenko, linux-kernel,
devicetree, linux-tegra
вт, 17 лют. 2026 р. о 10:18 Krzysztof Kozlowski <krzk@kernel.org> пише:
>
> On 17/02/2026 08:51, Svyatoslav Ryhel wrote:
> > вт, 17 лют. 2026 р. о 09:21 Krzysztof Kozlowski <krzk@kernel.org> пише:
> >>
> >> On 26/01/2026 20:07, Svyatoslav Ryhel wrote:
> >>> Introduce driver for the External Memory Controller (EMC) found in
> >>> Tegra114 SoC. It controls the external DRAM on the board. The purpose of
> >>> this driver is to program memory timing for external memory on the EMC
> >>> clock rate change.
> >>>
> >>> Signed-off-by: Svyatoslav Ryhel <clamor95@gmail.com>
> >>> Reviewed-by: Mikko Perttunen <mperttunen@nvidia.com>
> >>> ---
> >>> drivers/memory/tegra/Kconfig | 12 +
> >>> drivers/memory/tegra/Makefile | 1 +
> >>> drivers/memory/tegra/tegra114-emc.c | 1463 +++++++++++++++++++++++++++
> >>
> >> Please rebase on top of Mikko's patch removing duplicated code.
> >>
> >>> 3 files changed, 1476 insertions(+)
> >>> create mode 100644 drivers/memory/tegra/tegra114-emc.c
> >>>
> >>> diff --git a/drivers/memory/tegra/Kconfig b/drivers/memory/tegra/Kconfig
> >>> index fc5a27791826..11e7cc357d39 100644
> >>> --- a/drivers/memory/tegra/Kconfig
> >>> +++ b/drivers/memory/tegra/Kconfig
> >>> @@ -35,6 +35,18 @@ config TEGRA30_EMC
> >>> This driver is required to change memory timings / clock rate for
> >>> external memory.
> >>>
> >>> +config TEGRA114_EMC
> >>> + tristate "NVIDIA Tegra114 External Memory Controller driver"
> >>> + default y
> >>> + depends on ARCH_TEGRA_114_SOC || COMPILE_TEST
> >>> + select TEGRA124_CLK_EMC if ARCH_TEGRA
> >>> + select PM_OPP
> >>> + help
> >>> + This driver is for the External Memory Controller (EMC) found on
> >>> + Tegra114 chips. The EMC controls the external DRAM on the board.
> >>> + This driver is required to change memory timings / clock rate for
> >>> + external memory.
> >>> +
> >>> config TEGRA124_EMC
> >>> tristate "NVIDIA Tegra124 External Memory Controller driver"
> >>> default ARCH_TEGRA_124_SOC
> >>> diff --git a/drivers/memory/tegra/Makefile b/drivers/memory/tegra/Makefile
> >>> index 6334601e6120..6b9156de4b66 100644
> >>> --- a/drivers/memory/tegra/Makefile
> >>> +++ b/drivers/memory/tegra/Makefile
> >>> @@ -16,6 +16,7 @@ obj-$(CONFIG_TEGRA_MC) += tegra-mc.o
> >>>
> >>> obj-$(CONFIG_TEGRA20_EMC) += tegra20-emc.o
> >>> obj-$(CONFIG_TEGRA30_EMC) += tegra30-emc.o
> >>> +obj-$(CONFIG_TEGRA114_EMC) += tegra114-emc.o
> >>> obj-$(CONFIG_TEGRA124_EMC) += tegra124-emc.o
> >>> obj-$(CONFIG_TEGRA210_EMC_TABLE) += tegra210-emc-table.o
> >>> obj-$(CONFIG_TEGRA210_EMC) += tegra210-emc.o
> >>> diff --git a/drivers/memory/tegra/tegra114-emc.c b/drivers/memory/tegra/tegra114-emc.c
> >>> new file mode 100644
> >>> index 000000000000..789b8e959a68
> >>> --- /dev/null
> >>> +++ b/drivers/memory/tegra/tegra114-emc.c
> >>> @@ -0,0 +1,1463 @@
> >>> +// SPDX-License-Identifier: GPL-2.0-only
> >>> +/*
> >>> + * Tegra114 External Memory Controller driver
> >>> + *
> >>> + * Based on downstream driver from NVIDIA and tegra124-emc.c
> >>> + * Copyright (C) 2011-2014 NVIDIA Corporation
> >>> + *
> >>> + * Copyright (C) 2024 Svyatoslav Ryhel <clamor95@gmail.com>
> >>> + */
> >>> +
> >>> +#include <linux/clk-provider.h>
> >>
> >> Where is it used?
> >>
> >>> +#include <linux/clk.h>
> >>> +#include <linux/clkdev.h>
> >>
> >> Where is it used?
> >>
> >>> +#include <linux/clk/tegra.h>
> >>
> >> Where is it used?
> >>
> >
> > All 4 by tegra124_clk_set_emc_callbacks
>
> What? That's not how C works.
>
> There is no definition of tegra124_clk_set_emc_callbacks here in this
> patch, so the headers are not used. Point me to any symbols from these
> headers being used in this patch.
>
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/include/linux/clk/tegra.h?h=v6.19#n199
> Best regards,
> Krzysztof
^ permalink raw reply [flat|nested] 18+ messages in thread
* Re: [PATCH v1 5/5] memory: tegra: Add Tegra114 EMC driver
2026-02-17 8:29 ` Svyatoslav Ryhel
@ 2026-02-17 8:33 ` Krzysztof Kozlowski
0 siblings, 0 replies; 18+ messages in thread
From: Krzysztof Kozlowski @ 2026-02-17 8:33 UTC (permalink / raw)
To: Svyatoslav Ryhel
Cc: Rob Herring, Conor Dooley, Thierry Reding, Jonathan Hunter,
Mikko Perttunen, Sumit Gupta, Dmitry Osipenko, linux-kernel,
devicetree, linux-tegra
On 17/02/2026 09:29, Svyatoslav Ryhel wrote:
>>>>>
>>>>> obj-$(CONFIG_TEGRA20_EMC) += tegra20-emc.o
>>>>> obj-$(CONFIG_TEGRA30_EMC) += tegra30-emc.o
>>>>> +obj-$(CONFIG_TEGRA114_EMC) += tegra114-emc.o
>>>>> obj-$(CONFIG_TEGRA124_EMC) += tegra124-emc.o
>>>>> obj-$(CONFIG_TEGRA210_EMC_TABLE) += tegra210-emc-table.o
>>>>> obj-$(CONFIG_TEGRA210_EMC) += tegra210-emc.o
>>>>> diff --git a/drivers/memory/tegra/tegra114-emc.c b/drivers/memory/tegra/tegra114-emc.c
>>>>> new file mode 100644
>>>>> index 000000000000..789b8e959a68
>>>>> --- /dev/null
>>>>> +++ b/drivers/memory/tegra/tegra114-emc.c
>>>>> @@ -0,0 +1,1463 @@
>>>>> +// SPDX-License-Identifier: GPL-2.0-only
>>>>> +/*
>>>>> + * Tegra114 External Memory Controller driver
>>>>> + *
>>>>> + * Based on downstream driver from NVIDIA and tegra124-emc.c
>>>>> + * Copyright (C) 2011-2014 NVIDIA Corporation
>>>>> + *
>>>>> + * Copyright (C) 2024 Svyatoslav Ryhel <clamor95@gmail.com>
>>>>> + */
>>>>> +
>>>>> +#include <linux/clk-provider.h>
>>>>
>>>> Where is it used?
>>>>
>>>>> +#include <linux/clk.h>
>>>>> +#include <linux/clkdev.h>
>>>>
>>>> Where is it used?
>>>>
>>>>> +#include <linux/clk/tegra.h>
>>>>
>>>> Where is it used?
>>>>
>>>
>>> All 4 by tegra124_clk_set_emc_callbacks
>>
>> What? That's not how C works.
>>
>> There is no definition of tegra124_clk_set_emc_callbacks here in this
>> patch, so the headers are not used. Point me to any symbols from these
>> headers being used in this patch.
>>
>
> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/include/linux/clk/tegra.h?h=v6.19#n199
>
This is different header, I asked for using in this patch (or rather
this C unit). Plus that header does not even use things I asked above -
no clkdev, no interconnect, no clk provider.
Best regards,
Krzysztof
^ permalink raw reply [flat|nested] 18+ messages in thread
* Re: [PATCH v1 3/5] dt-bindings: memory: Add Tegra114 memory client IDs
2026-02-17 7:22 ` Krzysztof Kozlowski
2026-02-17 8:02 ` Svyatoslav Ryhel
@ 2026-03-27 23:53 ` Thierry Reding
2026-03-28 11:40 ` Krzysztof Kozlowski
1 sibling, 1 reply; 18+ messages in thread
From: Thierry Reding @ 2026-03-27 23:53 UTC (permalink / raw)
To: Krzysztof Kozlowski
Cc: Svyatoslav Ryhel, Rob Herring, Conor Dooley, Thierry Reding,
Jonathan Hunter, Mikko Perttunen, Sumit Gupta, Dmitry Osipenko,
linux-kernel, devicetree, linux-tegra
[-- Attachment #1: Type: text/plain, Size: 1069 bytes --]
On Tue, Feb 17, 2026 at 08:22:24AM +0100, Krzysztof Kozlowski wrote:
> On 26/01/2026 20:07, Svyatoslav Ryhel wrote:
> > Each memory client has unique hardware ID, add these IDs.
> >
> > Signed-off-by: Svyatoslav Ryhel <clamor95@gmail.com>
> > Acked-by: Rob Herring (Arm) <robh@kernel.org>
> > Reviewed-by: Mikko Perttunen <mperttunen@nvidia.com>
> > ---
> > include/dt-bindings/memory/tegra114-mc.h | 67 ++++++++++++++++++++++++
>
> This is never a separate commit. Squash with the binding.
You have previously requested that bindings and driver changes be
applied together. If this header file is applied to your memory tree it
means I cannot apply the corresponding DT changes until a release later
because the defines are part of the header included in the DT bindings
patch.
Seems a bit suboptimal. Do you have any good ideas on how to solve that
particular issue? The only one that comes to mind is for you to pick up
the DT changes as well, though that obviously runs a greater risk of
causing merge conflicts down the road.
Thierry
[-- Attachment #2: signature.asc --]
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^ permalink raw reply [flat|nested] 18+ messages in thread
* Re: [PATCH v1 3/5] dt-bindings: memory: Add Tegra114 memory client IDs
2026-03-27 23:53 ` Thierry Reding
@ 2026-03-28 11:40 ` Krzysztof Kozlowski
2026-03-28 12:11 ` Krzysztof Kozlowski
0 siblings, 1 reply; 18+ messages in thread
From: Krzysztof Kozlowski @ 2026-03-28 11:40 UTC (permalink / raw)
To: Thierry Reding
Cc: Svyatoslav Ryhel, Rob Herring, Conor Dooley, Thierry Reding,
Jonathan Hunter, Mikko Perttunen, Sumit Gupta, Dmitry Osipenko,
linux-kernel, devicetree, linux-tegra
On 28/03/2026 00:53, Thierry Reding wrote:
> On Tue, Feb 17, 2026 at 08:22:24AM +0100, Krzysztof Kozlowski wrote:
>> On 26/01/2026 20:07, Svyatoslav Ryhel wrote:
>>> Each memory client has unique hardware ID, add these IDs.
>>>
>>> Signed-off-by: Svyatoslav Ryhel <clamor95@gmail.com>
>>> Acked-by: Rob Herring (Arm) <robh@kernel.org>
>>> Reviewed-by: Mikko Perttunen <mperttunen@nvidia.com>
>>> ---
>>> include/dt-bindings/memory/tegra114-mc.h | 67 ++++++++++++++++++++++++
>>
>> This is never a separate commit. Squash with the binding.
>
> You have previously requested that bindings and driver changes be
> applied together. If this header file is applied to your memory tree it
> means I cannot apply the corresponding DT changes until a release later
> because the defines are part of the header included in the DT bindings
> patch.
I cannot apply the driver either without it, because it uses it, no?
Otherwise what is it doing in bindings if the driver is not using it?
>
> Seems a bit suboptimal. Do you have any good ideas on how to solve that
We listed five already in maintainer soc profile. Are they not good?
> particular issue? The only one that comes to mind is for you to pick up
> the DT changes as well, though that obviously runs a greater risk of
> causing merge conflicts down the road.
Best regards,
Krzysztof
^ permalink raw reply [flat|nested] 18+ messages in thread
* Re: [PATCH v1 3/5] dt-bindings: memory: Add Tegra114 memory client IDs
2026-03-28 11:40 ` Krzysztof Kozlowski
@ 2026-03-28 12:11 ` Krzysztof Kozlowski
0 siblings, 0 replies; 18+ messages in thread
From: Krzysztof Kozlowski @ 2026-03-28 12:11 UTC (permalink / raw)
To: Thierry Reding
Cc: Svyatoslav Ryhel, Rob Herring, Conor Dooley, Thierry Reding,
Jonathan Hunter, Mikko Perttunen, Sumit Gupta, Dmitry Osipenko,
linux-kernel, devicetree, linux-tegra
On 28/03/2026 12:40, Krzysztof Kozlowski wrote:
> On 28/03/2026 00:53, Thierry Reding wrote:
>> On Tue, Feb 17, 2026 at 08:22:24AM +0100, Krzysztof Kozlowski wrote:
>>> On 26/01/2026 20:07, Svyatoslav Ryhel wrote:
>>>> Each memory client has unique hardware ID, add these IDs.
>>>>
>>>> Signed-off-by: Svyatoslav Ryhel <clamor95@gmail.com>
>>>> Acked-by: Rob Herring (Arm) <robh@kernel.org>
>>>> Reviewed-by: Mikko Perttunen <mperttunen@nvidia.com>
>>>> ---
>>>> include/dt-bindings/memory/tegra114-mc.h | 67 ++++++++++++++++++++++++
>>>
>>> This is never a separate commit. Squash with the binding.
>>
>> You have previously requested that bindings and driver changes be
>> applied together. If this header file is applied to your memory tree it
>> means I cannot apply the corresponding DT changes until a release later
>> because the defines are part of the header included in the DT bindings
>> patch.
>
> I cannot apply the driver either without it, because it uses it, no?
> Otherwise what is it doing in bindings if the driver is not using it?
>
>>
>> Seems a bit suboptimal. Do you have any good ideas on how to solve that
>
> We listed five already in maintainer soc profile. Are they not good?
>
>> particular issue? The only one that comes to mind is for you to pick up
>> the DT changes as well, though that obviously runs a greater risk of
>> causing merge conflicts down the road.
One more thing:
There is no DTS here and nothing explains (commit msgs, changelogs or
cover letter) that there is any dependency and this was supposed to go
other tree. So the squash-or-not-squash is absolutely irrelevant to your
question/problem how DTS should deal with it.
Best regards,
Krzysztof
^ permalink raw reply [flat|nested] 18+ messages in thread
end of thread, other threads:[~2026-03-28 12:11 UTC | newest]
Thread overview: 18+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2026-01-26 19:07 [PATCH v1 0/5] Tegra114: implement EMC support Svyatoslav Ryhel
2026-01-26 19:07 ` [PATCH v1 1/5] dt-bindings: memory: Document Tegra114 Memory Controller Svyatoslav Ryhel
2026-01-26 19:07 ` [PATCH v1 2/5] memory: tegra: implement EMEM regs and ICC ops for Tegra114 Svyatoslav Ryhel
2026-01-26 19:07 ` [PATCH v1 3/5] dt-bindings: memory: Add Tegra114 memory client IDs Svyatoslav Ryhel
2026-02-17 7:22 ` Krzysztof Kozlowski
2026-02-17 8:02 ` Svyatoslav Ryhel
2026-02-17 8:15 ` Krzysztof Kozlowski
2026-02-17 8:24 ` Svyatoslav Ryhel
2026-03-27 23:53 ` Thierry Reding
2026-03-28 11:40 ` Krzysztof Kozlowski
2026-03-28 12:11 ` Krzysztof Kozlowski
2026-01-26 19:07 ` [PATCH v1 4/5] dt-bindings: memory: Document Tegra114 External Memory Controller Svyatoslav Ryhel
2026-01-26 19:07 ` [PATCH v1 5/5] memory: tegra: Add Tegra114 EMC driver Svyatoslav Ryhel
2026-02-17 7:21 ` Krzysztof Kozlowski
2026-02-17 7:51 ` Svyatoslav Ryhel
2026-02-17 8:18 ` Krzysztof Kozlowski
2026-02-17 8:29 ` Svyatoslav Ryhel
2026-02-17 8:33 ` Krzysztof Kozlowski
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