From: George Neacsu via B4 Relay <devnull+geocausa.gmail.com@kernel.org>
To: Bryan O'Donoghue <bod@kernel.org>, Vinod Koul <vkoul@kernel.org>,
David Heidelberg <david@ixit.cz>
Cc: Neil Armstrong <neil.armstrong@linaro.org>,
Vladimir Zapolskiy <vladimir.zapolskiy@linaro.org>,
Loic Poulain <loic.poulain@oss.qualcomm.com>,
Mauro Carvalho Chehab <mchehab@kernel.org>,
Manivannan Sadhasivam <mani@kernel.org>,
linux-phy@lists.infradead.org, linux-media@vger.kernel.org,
linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org,
George Neacsu <geocausa@gmail.com>
Subject: [PATCH RFC 2/4] phy: qcom-mipi-csi2: Add C-PHY support for X1E80100
Date: Thu, 15 Oct 2026 23:20:37 +0100 [thread overview]
Message-ID: <20261015-x1e-cphy-rfc-v1-2-1f3fa9af940a@gmail.com> (raw)
In-Reply-To: <20261015-x1e-cphy-rfc-v1-0-1f3fa9af940a@gmail.com>
From: George Neacsu <geocausa@gmail.com>
The CSI2 PHY schema already allows bus-type C-PHY, but the driver
rejects it. Accept it on SoCs that provide a C-PHY sequence: up to three
trios and no lane polarities, and set_mode() has to ask for the mode the
endpoint describes. In C-PHY mode, configure() takes the symbol rate.
lanes_enable() powers up the trios on the odd CTRL5 bits and writes the
C-PHY sequence, which carries its own timing, so no settle count is
computed.
The X1E80100 sequence is Qualcomm's for the v2.1.2 3PH PHY at 2.5 Gsps,
taken from the downstream camera driver's GPL-2.0
cam_csiphy_2_1_2_hwreg.h (csiphy_3ph_v2_1_2_reg, datarate_212_2p5Gsps
and the 3PH reset exit), as the D-PHY sequence above it is.
Tested on the Surface Pro 11 (X1E80100) with an IMX681 on CSIPHY2, one
trio at 2.4 Gsym/s, and raw capture through CSID1 and an RDI interface:
3844x2640 at 30.01 fps, and the sensor's colour bars are byte-identical
to the same pattern captured with an out-of-tree driver. D-PHY is
unchanged: an OV13858 on CSIPHY1 over four lanes streams at 29.9 fps.
Assisted-by: Claude:claude-opus-5-5
Signed-off-by: George Neacsu <geocausa@gmail.com>
---
drivers/phy/qualcomm/phy-qcom-mipi-csi2-3ph-dphy.c | 151 ++++++++++++++++++++-
drivers/phy/qualcomm/phy-qcom-mipi-csi2-core.c | 49 ++++++-
drivers/phy/qualcomm/phy-qcom-mipi-csi2.h | 4 +
3 files changed, 197 insertions(+), 7 deletions(-)
diff --git a/drivers/phy/qualcomm/phy-qcom-mipi-csi2-3ph-dphy.c b/drivers/phy/qualcomm/phy-qcom-mipi-csi2-3ph-dphy.c
index 966d79c98..e758b6755 100644
--- a/drivers/phy/qualcomm/phy-qcom-mipi-csi2-3ph-dphy.c
+++ b/drivers/phy/qualcomm/phy-qcom-mipi-csi2-3ph-dphy.c
@@ -6,6 +6,7 @@
* Copyright (C) 2016-2026 Linaro Ltd.
*/
+#include <dt-bindings/media/video-interfaces.h>
#include <linux/delay.h>
#include <linux/interrupt.h>
#include <linux/io.h>
@@ -161,6 +162,131 @@ mipi_csi2phy_lane_regs lane_regs_x1e80100[] = {
{.reg_addr = 0x0c64, .reg_data = 0x7f, .param_type = CSIPHY_SKEW_CAL},
};
+/*
+ * 4nm 3PH v2.1.2 C-PHY, 2.5 Gsps, from Qualcomm's GPL-2.0 camera driver
+ * (cam_csiphy_2_1_2_hwreg.h: csiphy_3ph_v2_1_2_reg[], datarate_212_2p5Gsps[]
+ * and the 3PH reset-exit write), one trio block per lane triplet.
+ */
+static const struct
+mipi_csi2phy_lane_regs lane_regs_x1e80100_cphy[] = {
+ /* Power up lanes 3ph mode */
+ {.reg_addr = 0x101c, .reg_data = 0x7a, .param_type = CSIPHY_DEFAULT_PARAMS},
+ {.reg_addr = 0x1018, .reg_data = 0x01, .param_type = CSIPHY_DEFAULT_PARAMS},
+ /* datarate_212_2p5Gsps: AFE settings */
+ {.reg_addr = 0x0268, .reg_data = 0xf1, .param_type = CSIPHY_DEFAULT_PARAMS},
+ {.reg_addr = 0x0294, .reg_data = 0x01, .param_type = CSIPHY_DEFAULT_PARAMS},
+ {.reg_addr = 0x0288, .reg_data = 0x20, .param_type = CSIPHY_DEFAULT_PARAMS},
+ {.reg_addr = 0x0278, .reg_data = 0x20, .param_type = CSIPHY_DEFAULT_PARAMS},
+ {.reg_addr = 0x026c, .reg_data = 0x3d, .param_type = CSIPHY_DEFAULT_PARAMS},
+ {.reg_addr = 0x028c, .reg_data = 0x30, .param_type = CSIPHY_DEFAULT_PARAMS},
+ {.reg_addr = 0x0270, .reg_data = 0x00, .param_type = CSIPHY_DEFAULT_PARAMS},
+ {.reg_addr = 0x0274, .reg_data = 0x03, .param_type = CSIPHY_DEFAULT_PARAMS},
+ {.reg_addr = 0x0668, .reg_data = 0xf1, .param_type = CSIPHY_DEFAULT_PARAMS},
+ {.reg_addr = 0x0694, .reg_data = 0x01, .param_type = CSIPHY_DEFAULT_PARAMS},
+ {.reg_addr = 0x0688, .reg_data = 0x20, .param_type = CSIPHY_DEFAULT_PARAMS},
+ {.reg_addr = 0x0678, .reg_data = 0x20, .param_type = CSIPHY_DEFAULT_PARAMS},
+ {.reg_addr = 0x066c, .reg_data = 0x3d, .param_type = CSIPHY_DEFAULT_PARAMS},
+ {.reg_addr = 0x068c, .reg_data = 0x30, .param_type = CSIPHY_DEFAULT_PARAMS},
+ {.reg_addr = 0x0670, .reg_data = 0x00, .param_type = CSIPHY_DEFAULT_PARAMS},
+ {.reg_addr = 0x0674, .reg_data = 0x03, .param_type = CSIPHY_DEFAULT_PARAMS},
+ {.reg_addr = 0x0a68, .reg_data = 0xf1, .param_type = CSIPHY_DEFAULT_PARAMS},
+ {.reg_addr = 0x0a94, .reg_data = 0x01, .param_type = CSIPHY_DEFAULT_PARAMS},
+ {.reg_addr = 0x0a88, .reg_data = 0x20, .param_type = CSIPHY_DEFAULT_PARAMS},
+ {.reg_addr = 0x0a78, .reg_data = 0x20, .param_type = CSIPHY_DEFAULT_PARAMS},
+ {.reg_addr = 0x0a6c, .reg_data = 0x3d, .param_type = CSIPHY_DEFAULT_PARAMS},
+ {.reg_addr = 0x0a8c, .reg_data = 0x30, .param_type = CSIPHY_DEFAULT_PARAMS},
+ {.reg_addr = 0x0a70, .reg_data = 0x00, .param_type = CSIPHY_DEFAULT_PARAMS},
+ {.reg_addr = 0x0a74, .reg_data = 0x03, .delay_us = 10, .param_type = CSIPHY_DEFAULT_PARAMS},
+ /* csiphy_3ph_v2_1_2_reg */
+ {.reg_addr = 0x02f4, .reg_data = 0x00, .param_type = CSIPHY_DEFAULT_PARAMS},
+ {.reg_addr = 0x02f8, .reg_data = 0x00, .param_type = CSIPHY_DEFAULT_PARAMS},
+ {.reg_addr = 0x02fc, .reg_data = 0x00, .param_type = CSIPHY_DEFAULT_PARAMS},
+ {.reg_addr = 0x02f0, .reg_data = 0xef, .delay_us = 3, .param_type = CSIPHY_DEFAULT_PARAMS},
+ {.reg_addr = 0x06f4, .reg_data = 0x00, .param_type = CSIPHY_DEFAULT_PARAMS},
+ {.reg_addr = 0x06f8, .reg_data = 0x00, .param_type = CSIPHY_DEFAULT_PARAMS},
+ {.reg_addr = 0x06fc, .reg_data = 0x00, .param_type = CSIPHY_DEFAULT_PARAMS},
+ {.reg_addr = 0x06f0, .reg_data = 0xef, .delay_us = 3, .param_type = CSIPHY_DEFAULT_PARAMS},
+ {.reg_addr = 0x0af4, .reg_data = 0x00, .param_type = CSIPHY_DEFAULT_PARAMS},
+ {.reg_addr = 0x0af8, .reg_data = 0x00, .param_type = CSIPHY_DEFAULT_PARAMS},
+ {.reg_addr = 0x0afc, .reg_data = 0x00, .param_type = CSIPHY_DEFAULT_PARAMS},
+ {.reg_addr = 0x0af0, .reg_data = 0xef, .delay_us = 3, .param_type = CSIPHY_DEFAULT_PARAMS},
+ /* datarate_212_2p5Gsps, then csiphy_3ph_v2_1_2_reg */
+ {.reg_addr = 0x020c, .reg_data = 0x22, .param_type = CSIPHY_DEFAULT_PARAMS},
+ {.reg_addr = 0x0208, .reg_data = 0x00, .param_type = CSIPHY_DEFAULT_PARAMS},
+ {.reg_addr = 0x0210, .reg_data = 0x00, .param_type = CSIPHY_DEFAULT_PARAMS},
+ {.reg_addr = 0x0214, .reg_data = 0x00, .param_type = CSIPHY_DEFAULT_PARAMS},
+ {.reg_addr = 0x0204, .reg_data = 0x00, .param_type = CSIPHY_DEFAULT_PARAMS},
+ {.reg_addr = 0x02e4, .reg_data = 0x00, .param_type = CSIPHY_DEFAULT_PARAMS},
+ {.reg_addr = 0x02e8, .reg_data = 0x7f, .param_type = CSIPHY_DEFAULT_PARAMS},
+ {.reg_addr = 0x02ec, .reg_data = 0x7f, .param_type = CSIPHY_DEFAULT_PARAMS},
+ {.reg_addr = 0x0218, .reg_data = 0x3e, .param_type = CSIPHY_DEFAULT_PARAMS},
+ {.reg_addr = 0x021c, .reg_data = 0x41, .param_type = CSIPHY_DEFAULT_PARAMS},
+ {.reg_addr = 0x0220, .reg_data = 0x41, .param_type = CSIPHY_DEFAULT_PARAMS},
+ {.reg_addr = 0x0224, .reg_data = 0x7f, .param_type = CSIPHY_DEFAULT_PARAMS},
+ {.reg_addr = 0x0228, .reg_data = 0x00, .param_type = CSIPHY_DEFAULT_PARAMS},
+ {.reg_addr = 0x022c, .reg_data = 0x00, .param_type = CSIPHY_DEFAULT_PARAMS},
+ {.reg_addr = 0x0264, .reg_data = 0x01, .param_type = CSIPHY_DEFAULT_PARAMS},
+ {.reg_addr = 0x0244, .reg_data = 0xb2, .param_type = CSIPHY_DEFAULT_PARAMS},
+ {.reg_addr = 0x0310, .reg_data = 0x35, .param_type = CSIPHY_DEFAULT_PARAMS},
+ {.reg_addr = 0x02bc, .reg_data = 0xd0, .param_type = CSIPHY_DEFAULT_PARAMS},
+ {.reg_addr = 0x0254, .reg_data = 0x00, .param_type = CSIPHY_DEFAULT_PARAMS},
+ {.reg_addr = 0x0240, .reg_data = 0x00, .param_type = CSIPHY_DEFAULT_PARAMS},
+ {.reg_addr = 0x0260, .reg_data = 0xa8, .param_type = CSIPHY_DEFAULT_PARAMS},
+ {.reg_addr = 0x0284, .reg_data = 0x00, .param_type = CSIPHY_DEFAULT_PARAMS},
+ {.reg_addr = 0x0290, .reg_data = 0x02, .param_type = CSIPHY_DEFAULT_PARAMS},
+ /* datarate_212_2p5Gsps, then csiphy_3ph_v2_1_2_reg */
+ {.reg_addr = 0x060c, .reg_data = 0x22, .param_type = CSIPHY_DEFAULT_PARAMS},
+ {.reg_addr = 0x0608, .reg_data = 0x00, .param_type = CSIPHY_DEFAULT_PARAMS},
+ {.reg_addr = 0x0610, .reg_data = 0x00, .param_type = CSIPHY_DEFAULT_PARAMS},
+ {.reg_addr = 0x0614, .reg_data = 0x00, .param_type = CSIPHY_DEFAULT_PARAMS},
+ {.reg_addr = 0x0604, .reg_data = 0x00, .param_type = CSIPHY_DEFAULT_PARAMS},
+ {.reg_addr = 0x06e4, .reg_data = 0x00, .param_type = CSIPHY_DEFAULT_PARAMS},
+ {.reg_addr = 0x06e8, .reg_data = 0x7f, .param_type = CSIPHY_DEFAULT_PARAMS},
+ {.reg_addr = 0x06ec, .reg_data = 0x7f, .param_type = CSIPHY_DEFAULT_PARAMS},
+ {.reg_addr = 0x0618, .reg_data = 0x3e, .param_type = CSIPHY_DEFAULT_PARAMS},
+ {.reg_addr = 0x061c, .reg_data = 0x41, .param_type = CSIPHY_DEFAULT_PARAMS},
+ {.reg_addr = 0x0620, .reg_data = 0x41, .param_type = CSIPHY_DEFAULT_PARAMS},
+ {.reg_addr = 0x0624, .reg_data = 0x7f, .param_type = CSIPHY_DEFAULT_PARAMS},
+ {.reg_addr = 0x0628, .reg_data = 0x00, .param_type = CSIPHY_DEFAULT_PARAMS},
+ {.reg_addr = 0x062c, .reg_data = 0x00, .param_type = CSIPHY_DEFAULT_PARAMS},
+ {.reg_addr = 0x0664, .reg_data = 0x01, .param_type = CSIPHY_DEFAULT_PARAMS},
+ {.reg_addr = 0x0644, .reg_data = 0xb2, .param_type = CSIPHY_DEFAULT_PARAMS},
+ {.reg_addr = 0x0710, .reg_data = 0x35, .param_type = CSIPHY_DEFAULT_PARAMS},
+ {.reg_addr = 0x06bc, .reg_data = 0xd0, .param_type = CSIPHY_DEFAULT_PARAMS},
+ {.reg_addr = 0x0654, .reg_data = 0x00, .param_type = CSIPHY_DEFAULT_PARAMS},
+ {.reg_addr = 0x0640, .reg_data = 0x00, .param_type = CSIPHY_DEFAULT_PARAMS},
+ {.reg_addr = 0x0660, .reg_data = 0xa8, .param_type = CSIPHY_DEFAULT_PARAMS},
+ {.reg_addr = 0x0684, .reg_data = 0x00, .param_type = CSIPHY_DEFAULT_PARAMS},
+ {.reg_addr = 0x0690, .reg_data = 0x02, .param_type = CSIPHY_DEFAULT_PARAMS},
+ /* datarate_212_2p5Gsps, then csiphy_3ph_v2_1_2_reg */
+ {.reg_addr = 0x0a0c, .reg_data = 0x22, .param_type = CSIPHY_DEFAULT_PARAMS},
+ {.reg_addr = 0x0a08, .reg_data = 0x00, .param_type = CSIPHY_DEFAULT_PARAMS},
+ {.reg_addr = 0x0a10, .reg_data = 0x00, .param_type = CSIPHY_DEFAULT_PARAMS},
+ {.reg_addr = 0x0a14, .reg_data = 0x00, .param_type = CSIPHY_DEFAULT_PARAMS},
+ {.reg_addr = 0x0a04, .reg_data = 0x00, .param_type = CSIPHY_DEFAULT_PARAMS},
+ {.reg_addr = 0x0ae4, .reg_data = 0x00, .param_type = CSIPHY_DEFAULT_PARAMS},
+ {.reg_addr = 0x0ae8, .reg_data = 0x7f, .param_type = CSIPHY_DEFAULT_PARAMS},
+ {.reg_addr = 0x0aec, .reg_data = 0x7f, .param_type = CSIPHY_DEFAULT_PARAMS},
+ {.reg_addr = 0x0a18, .reg_data = 0x3e, .param_type = CSIPHY_DEFAULT_PARAMS},
+ {.reg_addr = 0x0a1c, .reg_data = 0x41, .param_type = CSIPHY_DEFAULT_PARAMS},
+ {.reg_addr = 0x0a20, .reg_data = 0x41, .param_type = CSIPHY_DEFAULT_PARAMS},
+ {.reg_addr = 0x0a24, .reg_data = 0x7f, .param_type = CSIPHY_DEFAULT_PARAMS},
+ {.reg_addr = 0x0a28, .reg_data = 0x00, .param_type = CSIPHY_DEFAULT_PARAMS},
+ {.reg_addr = 0x0a2c, .reg_data = 0x00, .param_type = CSIPHY_DEFAULT_PARAMS},
+ {.reg_addr = 0x0a64, .reg_data = 0x01, .param_type = CSIPHY_DEFAULT_PARAMS},
+ {.reg_addr = 0x0a44, .reg_data = 0xb2, .param_type = CSIPHY_DEFAULT_PARAMS},
+ {.reg_addr = 0x0b10, .reg_data = 0x35, .param_type = CSIPHY_DEFAULT_PARAMS},
+ {.reg_addr = 0x0abc, .reg_data = 0xd0, .param_type = CSIPHY_DEFAULT_PARAMS},
+ {.reg_addr = 0x0a54, .reg_data = 0x00, .param_type = CSIPHY_DEFAULT_PARAMS},
+ {.reg_addr = 0x0a40, .reg_data = 0x00, .param_type = CSIPHY_DEFAULT_PARAMS},
+ {.reg_addr = 0x0a60, .reg_data = 0xa8, .param_type = CSIPHY_DEFAULT_PARAMS},
+ {.reg_addr = 0x0a84, .reg_data = 0x00, .param_type = CSIPHY_DEFAULT_PARAMS},
+ {.reg_addr = 0x0a90, .reg_data = 0x02, .param_type = CSIPHY_DEFAULT_PARAMS},
+ /* csiphy_reset_exit_reg_2_1_2, 3PH */
+ {.reg_addr = 0x1000, .reg_data = 0x0e, .delay_us = 3048,
+ .param_type = CSIPHY_DEFAULT_PARAMS},
+};
+
static inline const struct mipi_csi2phy_device_regs *
csi2phy_dev_to_regs(struct mipi_csi2phy_device *csi2phy)
{
@@ -246,8 +372,11 @@ phy_qcom_mipi_csi2_gen2_config_lanes(struct mipi_csi2phy_device *csi2phy,
u8 settle_cnt)
{
const struct mipi_csi2phy_device_regs *regs = csi2phy_dev_to_regs(csi2phy);
- const struct mipi_csi2phy_lane_regs *r = regs->init_seq;
- int i, array_size = regs->lane_array_size;
+ const bool cphy = csi2phy->bus_type == MEDIA_BUS_TYPE_CSI2_CPHY;
+ const struct mipi_csi2phy_lane_regs *r = cphy ? regs->cphy_init_seq :
+ regs->init_seq;
+ int i, array_size = cphy ? regs->cphy_lane_array_size :
+ regs->lane_array_size;
u32 val;
for (i = 0; i < array_size; i++, r++) {
@@ -273,13 +402,26 @@ static int phy_qcom_mipi_csi2_lanes_enable(struct mipi_csi2phy_device *csi2phy,
{
const struct mipi_csi2phy_device_regs *regs = csi2phy_dev_to_regs(csi2phy);
struct mipi_csi2phy_lanes_cfg *lane_cfg = &cfg->lane_cfg;
- u8 settle_cnt;
+ const bool cphy = csi2phy->bus_type == MEDIA_BUS_TYPE_CSI2_CPHY;
+ u8 settle_cnt = 0;
u8 val;
int i;
if (cfg->link_freq <= 0)
return -EINVAL;
+ if (cphy) {
+ /* The C-PHY sequence carries its own timing; trios are the odd bits. */
+ val = 0;
+ for (i = 0; i < cfg->num_data_lanes; i++)
+ val |= BIT(lane_cfg->data[i].pos * 2 + 1);
+
+ writel(val, csi2phy->base +
+ CSIPHY_3PH_CMN_CSI_COMMON_CTRLn(regs->common_regs_offset, 5));
+
+ goto common;
+ }
+
settle_cnt = phy_qcom_mipi_csi2_settle_cnt_calc(cfg->link_freq, csi2phy->timer_clk_rate);
if (!settle_cnt)
return -ENODEV;
@@ -309,6 +451,7 @@ static int phy_qcom_mipi_csi2_lanes_enable(struct mipi_csi2phy_device *csi2phy,
if (lane_cfg->clk.pol)
writel(BIT(2), csi2phy->base + CSIPHY_2PH_LN_CSI_2PHASE_CTRL9n(lane_cfg->clk.pos));
+common:
val = CSIPHY_3PH_CMN_CSI_COMMON_CTRL6_COMMON_PWRDN_B;
writel(val, csi2phy->base +
CSIPHY_3PH_CMN_CSI_COMMON_CTRLn(regs->common_regs_offset, 6));
@@ -374,6 +517,8 @@ const struct mipi_csi2phy_soc_cfg mipi_csi2_dphy_4nm_x1e = {
.reg_info = {
.init_seq = lane_regs_x1e80100,
.lane_array_size = ARRAY_SIZE(lane_regs_x1e80100),
+ .cphy_init_seq = lane_regs_x1e80100_cphy,
+ .cphy_lane_array_size = ARRAY_SIZE(lane_regs_x1e80100_cphy),
.common_regs_offset = 0x1000,
},
.supply_names = (const char **)x1e_supplies,
diff --git a/drivers/phy/qualcomm/phy-qcom-mipi-csi2-core.c b/drivers/phy/qualcomm/phy-qcom-mipi-csi2-core.c
index c0a4fa20e..892c3da55 100644
--- a/drivers/phy/qualcomm/phy-qcom-mipi-csi2-core.c
+++ b/drivers/phy/qualcomm/phy-qcom-mipi-csi2-core.c
@@ -104,6 +104,19 @@ static int phy_qcom_mipi_csi2_configure(struct phy *phy,
struct mipi_csi2phy_stream_cfg *stream_cfg = &csi2phy->stream_cfg;
int ret;
+ if (csi2phy->phy_mode == PHY_MODE_MIPI_CPHY) {
+ struct phy_configure_opts_mipi_cphy *cphy_cfg = &opts->mipi_cphy;
+
+ if (!cphy_cfg->symbol_rate ||
+ cphy_cfg->lanes != stream_cfg->num_data_lanes)
+ return -EINVAL;
+
+ /* As for V4L2, a C-PHY link frequency is half the symbol rate. */
+ stream_cfg->link_freq = cphy_cfg->symbol_rate / 2;
+
+ return 0;
+ }
+
ret = phy_mipi_dphy_config_validate(dphy_cfg);
if (ret)
return ret;
@@ -124,8 +137,19 @@ static int phy_qcom_mipi_csi2_set_mode(struct phy *phy,
{
struct mipi_csi2phy_device *csi2phy = phy_get_drvdata(phy);
- if (mode != PHY_MODE_MIPI_DPHY)
+ /* The mode has to be the bus the endpoint describes. */
+ switch (mode) {
+ case PHY_MODE_MIPI_DPHY:
+ if (csi2phy->bus_type != MEDIA_BUS_TYPE_CSI2_DPHY)
+ return -EINVAL;
+ break;
+ case PHY_MODE_MIPI_CPHY:
+ if (csi2phy->bus_type != MEDIA_BUS_TYPE_CSI2_CPHY)
+ return -EINVAL;
+ break;
+ default:
return -EOPNOTSUPP;
+ }
csi2phy->phy_mode = mode;
return 0;
@@ -258,6 +282,7 @@ static int phy_qcom_mipi_csi2_parse_routing(struct mipi_csi2phy_device *csi2phy)
struct fwnode_handle *ep;
int num_polarities;
int num_data_lanes;
+ int max_lanes;
u32 bus_type;
int i, ret;
@@ -278,14 +303,25 @@ static int phy_qcom_mipi_csi2_parse_routing(struct mipi_csi2phy_device *csi2phy)
bus_type = MEDIA_BUS_TYPE_CSI2_DPHY;
fwnode_property_read_u32(ep, "bus-type", &bus_type);
- if (bus_type != MEDIA_BUS_TYPE_CSI2_DPHY) {
+ switch (bus_type) {
+ case MEDIA_BUS_TYPE_CSI2_DPHY:
+ max_lanes = CSI2_MAX_DATA_LANES;
+ break;
+ case MEDIA_BUS_TYPE_CSI2_CPHY:
+ if (csi2phy->soc_cfg->reg_info.cphy_init_seq) {
+ max_lanes = CSI2_MAX_TRIOS;
+ break;
+ }
+ fallthrough;
+ default:
ret = -EOPNOTSUPP;
dev_err(dev, "Unsupported bus-type %u\n", bus_type);
goto out_put;
}
+ csi2phy->bus_type = bus_type;
num_data_lanes = fwnode_property_count_u32(ep, "data-lanes");
- if (num_data_lanes < 1 || num_data_lanes > CSI2_MAX_DATA_LANES) {
+ if (num_data_lanes < 1 || num_data_lanes > max_lanes) {
ret = -EINVAL;
dev_err(dev, "Invalid data-lanes count: %d\n", num_data_lanes);
goto out_put;
@@ -302,6 +338,11 @@ static int phy_qcom_mipi_csi2_parse_routing(struct mipi_csi2phy_device *csi2phy)
/* lane-polarities: optional, up to num_data_lanes + 1 entries */
memset(lane_polarities, 0x00, sizeof(lane_polarities));
num_polarities = fwnode_property_count_u32(ep, "lane-polarities");
+ if (num_polarities > 0 && bus_type == MEDIA_BUS_TYPE_CSI2_CPHY) {
+ ret = -EINVAL;
+ dev_err(dev, "lane-polarities do not apply to C-PHY\n");
+ goto out_put;
+ }
if (num_polarities > 0) {
if (num_polarities != stream_cfg->num_data_lanes + 1) {
ret = -EINVAL;
@@ -322,7 +363,7 @@ static int phy_qcom_mipi_csi2_parse_routing(struct mipi_csi2phy_device *csi2phy)
csi2phy->stream_cfg.lane_cfg.clk.pol = lane_polarities[0];
for (i = 0; i < csi2phy->stream_cfg.num_data_lanes; i++) {
- if (data_lanes[i] < 1 || data_lanes[i] > CSI2_MAX_DATA_LANES) {
+ if (data_lanes[i] < 1 || data_lanes[i] > max_lanes) {
dev_err(dev, "Invalid lane %d\n", data_lanes[i]);
ret = -EINVAL;
goto out_put;
diff --git a/drivers/phy/qualcomm/phy-qcom-mipi-csi2.h b/drivers/phy/qualcomm/phy-qcom-mipi-csi2.h
index 7e55ae007..442c4d6fe 100644
--- a/drivers/phy/qualcomm/phy-qcom-mipi-csi2.h
+++ b/drivers/phy/qualcomm/phy-qcom-mipi-csi2.h
@@ -11,6 +11,7 @@
#include <linux/phy/phy.h>
#define CSI2_MAX_DATA_LANES 4
+#define CSI2_MAX_TRIOS 3
#define CSI2_DEFAULT_CLK_LANE 7
struct mipi_csi2phy_lane {
@@ -50,6 +51,8 @@ struct mipi_csi2phy_lane_regs {
struct mipi_csi2phy_device_regs {
const struct mipi_csi2phy_lane_regs *init_seq;
const int lane_array_size;
+ const struct mipi_csi2phy_lane_regs *cphy_init_seq;
+ const int cphy_lane_array_size;
const u32 common_regs_offset;
};
@@ -75,6 +78,7 @@ struct mipi_csi2phy_soc_cfg {
struct mipi_csi2phy_device {
struct device *dev;
u8 phy_mode;
+ u32 bus_type;
struct phy *phy;
void __iomem *base;
--
2.53.0
next prev parent reply other threads:[~2026-10-15 22:20 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-10-15 22:20 [PATCH RFC 0/4] phy: qcom-mipi-csi2: C-PHY for X1E80100 George Neacsu via B4 Relay
2026-10-15 22:20 ` [PATCH RFC 1/4] phy: Add MIPI C-PHY mode and configuration options George Neacsu via B4 Relay
2026-10-16 9:13 ` Bryan O'Donoghue
2026-10-16 9:24 ` Loic Poulain
2026-10-15 22:20 ` George Neacsu via B4 Relay [this message]
2026-10-16 9:29 ` [PATCH RFC 2/4] phy: qcom-mipi-csi2: Add C-PHY support for X1E80100 Bryan O'Donoghue
2026-10-16 10:06 ` George Neacsu
2026-10-16 10:12 ` Bryan O'Donoghue
2026-10-16 9:59 ` Nihal Kumar Gupta
2026-10-16 10:06 ` George Neacsu
2026-10-16 10:23 ` Konrad Dybcio
2026-10-15 22:20 ` [PATCH RFC 3/4] media: qcom: camss: csid-680: Select C-PHY in the receiver George Neacsu via B4 Relay
2026-10-16 7:50 ` Loic Poulain
2026-10-15 22:20 ` [PATCH RFC 4/4] media: qcom: camss: Configure C-PHY through the PHY API George Neacsu via B4 Relay
2026-10-16 7:56 ` Loic Poulain
2026-10-16 8:59 ` Bryan O'Donoghue
2026-10-16 9:09 ` Bryan O'Donoghue
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20261015-x1e-cphy-rfc-v1-2-1f3fa9af940a@gmail.com \
--to=devnull+geocausa.gmail.com@kernel.org \
--cc=bod@kernel.org \
--cc=david@ixit.cz \
--cc=geocausa@gmail.com \
--cc=linux-arm-msm@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-media@vger.kernel.org \
--cc=linux-phy@lists.infradead.org \
--cc=loic.poulain@oss.qualcomm.com \
--cc=mani@kernel.org \
--cc=mchehab@kernel.org \
--cc=neil.armstrong@linaro.org \
--cc=vkoul@kernel.org \
--cc=vladimir.zapolskiy@linaro.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox