[PATCH v2 0/6] MMCC MSM8998 fixes

[PATCH v2 0/6] MMCC MSM8998 fixes

[Konrad Dybcio]

8998 has a couple of issues related to its clock controllers. This series
attemps to fix some of them.

The DT patch should go in first for bisectability, otherwise
clk/pd_ignore_unused will need to be used, as the SMMU GDSC is no longer
considered always-on.

This series results in less "clk stuck at 'on/off'" messages and should
marginally reduce power consumption.

Signed-off-by: Konrad Dybcio <konrad.dybcio@linaro.org>
---
Changes in v2:
- Update bindings
- Separate out the dt patch into two
- Pick up tags
- Link to v1: https://lore.kernel.org/r/20230531-topic-8998_mmssclk-v1-0-2b5a8fc90991@linaro.org

---
Konrad Dybcio (6):
      arm64: dts: qcom: msm8998: Drop bus clock reference from MMSS SMMU
      arm64: dts: qcom: msm8998: Add missing power domain to MMSS SMMU
      clk: qcom: gcc-msm8998: Don't check halt bit on some branch clks
      clk: qcom: mmcc-msm8998: Don't check halt bit on some branch clks
      clk: qcom: mmcc-msm8998: Fix the SMMU GDSC
      dt-bindings: arm-smmu: Fix MSM8998 clocks description

 .../devicetree/bindings/iommu/arm,smmu.yaml        | 41 ++++++++++++++++++++++
 arch/arm64/boot/dts/qcom/msm8998.dtsi              |  8 +++--
 drivers/clk/qcom/gcc-msm8998.c                     |  6 ++--
 drivers/clk/qcom/mmcc-msm8998.c                    |  7 +++-
 4 files changed, 55 insertions(+), 7 deletions(-)
---
base-commit: 71cd4fc492ec41e4acd85e98bbf7a13753fc1e03
change-id: 20230531-topic-8998_mmssclk-fd4b2fb7f8c1

Best regards,
-- 
Konrad Dybcio <konrad.dybcio@linaro.org>

[PATCH v2 1/6] arm64: dts: qcom: msm8998: Drop bus clock reference from MMSS SMMU

[Konrad Dybcio]

The MMSS SMMU has been abusingly consuming the exposed RPM interconnect
clock. Drop it.

Fixes: 05ce21b54423 ("arm64: dts: qcom: msm8998: Configure the multimedia subsystem iommu")
Signed-off-by: Konrad Dybcio <konrad.dybcio@linaro.org>
---
 arch/arm64/boot/dts/qcom/msm8998.dtsi | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/arch/arm64/boot/dts/qcom/msm8998.dtsi b/arch/arm64/boot/dts/qcom/msm8998.dtsi
index a41a34dbcc3c..e40f6461f4fd 100644
--- a/arch/arm64/boot/dts/qcom/msm8998.dtsi
+++ b/arch/arm64/boot/dts/qcom/msm8998.dtsi
@@ -2743,10 +2743,10 @@ mmss_smmu: iommu@cd00000 {
 
 			clocks = <&mmcc MNOC_AHB_CLK>,
 				 <&mmcc BIMC_SMMU_AHB_CLK>,
-				 <&rpmcc RPM_SMD_MMAXI_CLK>,
 				 <&mmcc BIMC_SMMU_AXI_CLK>;
-			clock-names = "iface-mm", "iface-smmu",
-				      "bus-mm", "bus-smmu";
+			clock-names = "iface-mm",
+				      "iface-smmu",
+				      "bus-smmu";
 
 			#global-interrupts = <0>;
 			interrupts =

-- 
2.41.0

[PATCH v2 2/6] arm64: dts: qcom: msm8998: Add missing power domain to MMSS SMMU

[Konrad Dybcio]

The MMSS SMMU has its own power domain. Attach it so that we can drop
the "keep it always-on" hack.

Fixes: 05ce21b54423 ("arm64: dts: qcom: msm8998: Configure the multimedia subsystem iommu")
Signed-off-by: Konrad Dybcio <konrad.dybcio@linaro.org>
---
 arch/arm64/boot/dts/qcom/msm8998.dtsi | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/arm64/boot/dts/qcom/msm8998.dtsi b/arch/arm64/boot/dts/qcom/msm8998.dtsi
index e40f6461f4fd..39db67211fae 100644
--- a/arch/arm64/boot/dts/qcom/msm8998.dtsi
+++ b/arch/arm64/boot/dts/qcom/msm8998.dtsi
@@ -2770,6 +2770,8 @@ mmss_smmu: iommu@cd00000 {
 				<GIC_SPI 261 IRQ_TYPE_LEVEL_HIGH>,
 				<GIC_SPI 262 IRQ_TYPE_LEVEL_HIGH>,
 				<GIC_SPI 272 IRQ_TYPE_LEVEL_HIGH>;
+
+			power-domains = <&mmcc BIMC_SMMU_GDSC>;
 		};
 
 		remoteproc_adsp: remoteproc@17300000 {

-- 
2.41.0

[PATCH v2 3/6] clk: qcom: gcc-msm8998: Don't check halt bit on some branch clks

[Konrad Dybcio]

Some branch clocks are governed externally and we're only supposed to
send a request concerning their shutdown, not actually ensure it happens.

Use the BRANCH_HALT_SKIP define to skip checking the halt bit.

Fixes: db2c7c0a04b1 ("clk: qcom: Add missing msm8998 gcc_bimc_gfx_clk")
Fixes: b5f5f525c547 ("clk: qcom: Add MSM8998 Global Clock Control (GCC) driver")
Reviewed-by: Jeffrey Hugo <quic_jhugo@quicinc.com>
Signed-off-by: Konrad Dybcio <konrad.dybcio@linaro.org>
---
 drivers/clk/qcom/gcc-msm8998.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/clk/qcom/gcc-msm8998.c b/drivers/clk/qcom/gcc-msm8998.c
index 1ba516a0c0f3..257b27d8eeb6 100644
--- a/drivers/clk/qcom/gcc-msm8998.c
+++ b/drivers/clk/qcom/gcc-msm8998.c
@@ -2060,7 +2060,7 @@ static struct clk_branch gcc_gp3_clk = {
 
 static struct clk_branch gcc_bimc_gfx_clk = {
 	.halt_reg = 0x46040,
-	.halt_check = BRANCH_HALT,
+	.halt_check = BRANCH_HALT_SKIP,
 	.clkr = {
 		.enable_reg = 0x46040,
 		.enable_mask = BIT(0),
@@ -2073,7 +2073,7 @@ static struct clk_branch gcc_bimc_gfx_clk = {
 
 static struct clk_branch gcc_gpu_bimc_gfx_clk = {
 	.halt_reg = 0x71010,
-	.halt_check = BRANCH_HALT,
+	.halt_check = BRANCH_HALT_SKIP,
 	.clkr = {
 		.enable_reg = 0x71010,
 		.enable_mask = BIT(0),
@@ -2099,7 +2099,7 @@ static struct clk_branch gcc_gpu_bimc_gfx_src_clk = {
 
 static struct clk_branch gcc_gpu_cfg_ahb_clk = {
 	.halt_reg = 0x71004,
-	.halt_check = BRANCH_HALT,
+	.halt_check = BRANCH_HALT_SKIP,
 	.clkr = {
 		.enable_reg = 0x71004,
 		.enable_mask = BIT(0),

-- 
2.41.0

[PATCH v2 4/6] clk: qcom: mmcc-msm8998: Don't check halt bit on some branch clks

[Konrad Dybcio]

Some branch clocks are governed externally and we're only supposed to
send a request concerning their shutdown, not actually ensure it happens.

Use the BRANCH_HALT_SKIP define to skip checking the halt bit.

Fixes: d14b15b5931c ("clk: qcom: Add MSM8998 Multimedia Clock Controller (MMCC) driver")
Reviewed-by: Jeffrey Hugo <quic_jhugo@quicinc.com>
Signed-off-by: Konrad Dybcio <konrad.dybcio@linaro.org>
---
 drivers/clk/qcom/mmcc-msm8998.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/clk/qcom/mmcc-msm8998.c b/drivers/clk/qcom/mmcc-msm8998.c
index c62aa270af1c..d0a5440e2291 100644
--- a/drivers/clk/qcom/mmcc-msm8998.c
+++ b/drivers/clk/qcom/mmcc-msm8998.c
@@ -2452,6 +2452,7 @@ static struct clk_branch fd_ahb_clk = {
 
 static struct clk_branch mnoc_ahb_clk = {
 	.halt_reg = 0x5024,
+	.halt_check = BRANCH_HALT_SKIP,
 	.clkr = {
 		.enable_reg = 0x5024,
 		.enable_mask = BIT(0),
@@ -2467,6 +2468,7 @@ static struct clk_branch mnoc_ahb_clk = {
 
 static struct clk_branch bimc_smmu_ahb_clk = {
 	.halt_reg = 0xe004,
+	.halt_check = BRANCH_HALT_SKIP,
 	.hwcg_reg = 0xe004,
 	.hwcg_bit = 1,
 	.clkr = {
@@ -2484,6 +2486,7 @@ static struct clk_branch bimc_smmu_ahb_clk = {
 
 static struct clk_branch bimc_smmu_axi_clk = {
 	.halt_reg = 0xe008,
+	.halt_check = BRANCH_HALT_SKIP,
 	.hwcg_reg = 0xe008,
 	.hwcg_bit = 1,
 	.clkr = {

-- 
2.41.0

[PATCH v2 5/6] clk: qcom: mmcc-msm8998: Fix the SMMU GDSC

[Konrad Dybcio]

The SMMU GDSC doesn't have to be ALWAYS-ON and shouldn't feature the
HW_CTRL flag (it's separate from hw_ctrl_addr).  In addition to that,
it should feature a cxc entry for bimc_smmu_axi_clk and be marked as
votable.

Fix all of these issues.

Fixes: d14b15b5931c ("clk: qcom: Add MSM8998 Multimedia Clock Controller (MMCC) driver")
Signed-off-by: Konrad Dybcio <konrad.dybcio@linaro.org>
---
 drivers/clk/qcom/mmcc-msm8998.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/clk/qcom/mmcc-msm8998.c b/drivers/clk/qcom/mmcc-msm8998.c
index d0a5440e2291..4fdc41e7d2a8 100644
--- a/drivers/clk/qcom/mmcc-msm8998.c
+++ b/drivers/clk/qcom/mmcc-msm8998.c
@@ -2627,11 +2627,13 @@ static struct gdsc camss_cpp_gdsc = {
 static struct gdsc bimc_smmu_gdsc = {
 	.gdscr = 0xe020,
 	.gds_hw_ctrl = 0xe024,
+	.cxcs = (unsigned int []){ 0xe008 },
+	.cxc_count = 1,
 	.pd = {
 		.name = "bimc_smmu",
 	},
 	.pwrsts = PWRSTS_OFF_ON,
-	.flags = HW_CTRL | ALWAYS_ON,
+	.flags = VOTABLE,
 };
 
 static struct clk_regmap *mmcc_msm8998_clocks[] = {

-- 
2.41.0

[PATCH v2 6/6] dt-bindings: arm-smmu: Fix MSM8998 clocks description

[Konrad Dybcio]

MSM8998 was abusingly referencing one of the internal bus clocks, that
were recently dropped from Linux (because the original implementation
did not make much sense), circumventing the interconnect framework.

Fix it.

Signed-off-by: Konrad Dybcio <konrad.dybcio@linaro.org>
---
 .../devicetree/bindings/iommu/arm,smmu.yaml        | 41 ++++++++++++++++++++++
 1 file changed, 41 insertions(+)

diff --git a/Documentation/devicetree/bindings/iommu/arm,smmu.yaml b/Documentation/devicetree/bindings/iommu/arm,smmu.yaml
index 3a31a979709b..cf29ab10501c 100644
--- a/Documentation/devicetree/bindings/iommu/arm,smmu.yaml
+++ b/Documentation/devicetree/bindings/iommu/arm,smmu.yaml
@@ -270,6 +270,47 @@ allOf:
           contains:
             enum:
               - qcom,msm8998-smmu-v2
+    then:
+      anyOf:
+        - properties:
+            clock-names:
+              items:
+                - const: bus
+            clocks:
+              items:
+                - description: bus clock required for downstream bus access and for
+                    the smmu ptw
+        - properties:
+            clock-names:
+              items:
+                - const: iface
+                - const: mem
+                - const: mem_iface
+            clocks:
+              items:
+                - description: interface clock required to access smmu's registers
+                    through the TCU's programming interface.
+                - description: bus clock required for memory access
+                - description: bus clock required for GPU memory access
+        - properties:
+            clock-names:
+              items:
+                - const: iface-mm
+                - const: iface-smmu
+                - const: bus-smmu
+            clocks:
+              items:
+                - description: interface clock required to access mnoc's registers
+                    through the TCU's programming interface.
+                - description: interface clock required to access smmu's registers
+                    through the TCU's programming interface.
+                - description: bus clock required for the smmu ptw
+
+  - if:
+      properties:
+        compatible:
+          contains:
+            enum:
               - qcom,sdm630-smmu-v2
               - qcom,sm6375-smmu-v2
     then:

-- 
2.41.0

Re: [PATCH v2 6/6] dt-bindings: arm-smmu: Fix MSM8998 clocks description

[Krzysztof Kozlowski]

On 08/08/2023 11:44, Konrad Dybcio wrote:
> MSM8998 was abusingly referencing one of the internal bus clocks, that
> were recently dropped from Linux (because the original implementation
> did not make much sense), circumventing the interconnect framework.

Please mention here that effectively you are dropping bus-mm clock and
the rest is the same as before. It's not possible to figure this out
from the diff alone.

With updated commit msg.

Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>


Best regards,
Krzysztof

Re: [PATCH v2 1/6] arm64: dts: qcom: msm8998: Drop bus clock reference from MMSS SMMU

[Jeffrey Hugo]

On 8/8/2023 3:44 AM, Konrad Dybcio wrote:
> The MMSS SMMU has been abusingly consuming the exposed RPM interconnect
> clock. Drop it.
> 
> Fixes: 05ce21b54423 ("arm64: dts: qcom: msm8998: Configure the multimedia subsystem iommu")
> Signed-off-by: Konrad Dybcio <konrad.dybcio@linaro.org>
> ---
>   arch/arm64/boot/dts/qcom/msm8998.dtsi | 6 +++---
>   1 file changed, 3 insertions(+), 3 deletions(-)

Reviewed-by: Jeffrey Hugo <quic_jhugo@quicinc.com>

Re: [PATCH v2 2/6] arm64: dts: qcom: msm8998: Add missing power domain to MMSS SMMU

[Jeffrey Hugo]

On 8/8/2023 3:44 AM, Konrad Dybcio wrote:
> The MMSS SMMU has its own power domain. Attach it so that we can drop
> the "keep it always-on" hack.
> 
> Fixes: 05ce21b54423 ("arm64: dts: qcom: msm8998: Configure the multimedia subsystem iommu")
> Signed-off-by: Konrad Dybcio <konrad.dybcio@linaro.org>

Reviewed-by: Jeffrey Hugo <quic_jhugo@quicinc.com>