[PATCH v3 0/6] Add support for GPU DDR BW scaling

[PATCH v3 0/6] Add support for GPU DDR BW scaling

[Sharat Masetty]

This is a respin of [1]. Incorported review feedback and fixed issues observed
during testing. Picked up the Georgi's series from opp/linux-next [2], and this
series is also dependent on a helper function needed to set and clear ddr
bandwidth vote [3]. Patch number 4 in the series adds support for SDM845 as well
but its not tested yet(WIP), but the SC7180 patches are well tested now.

[1] https://patchwork.freedesktop.org/series/75291/
[2] https://kernel.googlesource.com/pub/scm/linux/kernel/git/vireshk/pm/+log/opp/linux-next/
[3] https://patchwork.kernel.org/patch/11590563/

Sharat Masetty (6):
  dt-bindings: drm/msm/gpu: Document gpu opp table
  drm: msm: a6xx: send opp instead of a frequency
  drm: msm: a6xx: use dev_pm_opp_set_bw to scale DDR
  arm64: dts: qcom: SDM845: Enable GPU DDR bw scaling
  arm64: dts: qcom: sc7180: Add interconnects property for GPU
  arm64: dts: qcom: sc7180: Add opp-peak-kBps to GPU opp

 .../devicetree/bindings/display/msm/gpu.txt        | 28 +++++++
 arch/arm64/boot/dts/qcom/sc7180.dtsi               |  9 +++
 arch/arm64/boot/dts/qcom/sdm845.dtsi               |  9 +++
 drivers/gpu/drm/msm/adreno/a6xx_gmu.c              | 85 +++++++++++++---------
 drivers/gpu/drm/msm/adreno/a6xx_gpu.h              |  2 +-
 drivers/gpu/drm/msm/adreno/adreno_gpu.c            |  8 --
 drivers/gpu/drm/msm/msm_gpu.c                      |  3 +-
 drivers/gpu/drm/msm/msm_gpu.h                      |  5 +-
 8 files changed, 100 insertions(+), 49 deletions(-)

--
2.7.4

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[PATCH v3 1/6] dt-bindings: drm/msm/gpu: Document gpu opp table

[Sharat Masetty]

Update documentation to list the gpu opp table bindings including the
newly added "opp-peak-kBps" needed for GPU-DDR bandwidth scaling.

Signed-off-by: Sharat Masetty <smasetty@codeaurora.org>
Acked-by: Rob Herring <robh@kernel.org>
---
 .../devicetree/bindings/display/msm/gpu.txt        | 28 ++++++++++++++++++++++
 1 file changed, 28 insertions(+)

diff --git a/Documentation/devicetree/bindings/display/msm/gpu.txt b/Documentation/devicetree/bindings/display/msm/gpu.txt
index 70025cb..48bd4ab 100644
--- a/Documentation/devicetree/bindings/display/msm/gpu.txt
+++ b/Documentation/devicetree/bindings/display/msm/gpu.txt
@@ -79,6 +79,34 @@ Example a6xx (with GMU):

 		interconnects = <&rsc_hlos MASTER_GFX3D &rsc_hlos SLAVE_EBI1>;

+		gpu_opp_table: opp-table {
+			compatible = "operating-points-v2";
+
+			opp-430000000 {
+				opp-hz = /bits/ 64 <430000000>;
+				opp-level = <RPMH_REGULATOR_LEVEL_SVS_L1>;
+				opp-peak-kBps = <5412000>;
+			};
+
+			opp-355000000 {
+				opp-hz = /bits/ 64 <355000000>;
+				opp-level = <RPMH_REGULATOR_LEVEL_SVS>;
+				opp-peak-kBps = <3072000>;
+			};
+
+			opp-267000000 {
+				opp-hz = /bits/ 64 <267000000>;
+				opp-level = <RPMH_REGULATOR_LEVEL_LOW_SVS>;
+				opp-peak-kBps = <3072000>;
+			};
+
+			opp-180000000 {
+				opp-hz = /bits/ 64 <180000000>;
+				opp-level = <RPMH_REGULATOR_LEVEL_MIN_SVS>;
+				opp-peak-kBps = <1804000>;
+			};
+		};
+
 		qcom,gmu = <&gmu>;

 		zap-shader {
--
2.7.4

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[PATCH v3 2/6] drm: msm: a6xx: send opp instead of a frequency

[Sharat Masetty]

This patch changes the plumbing to send the devfreq recommended opp rather
than the frequency. Also consolidate and rearrange the code in a6xx to set
the GPU frequency and the icc vote in preparation for the upcoming
changes for GPU->DDR scaling votes.

Signed-off-by: Sharat Masetty <smasetty@codeaurora.org>
---
 drivers/gpu/drm/msm/adreno/a6xx_gmu.c | 62 +++++++++++++++++++----------------
 drivers/gpu/drm/msm/adreno/a6xx_gpu.h |  2 +-
 drivers/gpu/drm/msm/msm_gpu.c         |  3 +-
 drivers/gpu/drm/msm/msm_gpu.h         |  3 +-
 4 files changed, 38 insertions(+), 32 deletions(-)

diff --git a/drivers/gpu/drm/msm/adreno/a6xx_gmu.c b/drivers/gpu/drm/msm/adreno/a6xx_gmu.c
index 748cd37..2d8124b 100644
--- a/drivers/gpu/drm/msm/adreno/a6xx_gmu.c
+++ b/drivers/gpu/drm/msm/adreno/a6xx_gmu.c
@@ -100,17 +100,30 @@ bool a6xx_gmu_gx_is_on(struct a6xx_gmu *gmu)
 		A6XX_GMU_SPTPRAC_PWR_CLK_STATUS_GX_HM_CLK_OFF));
 }

-static void __a6xx_gmu_set_freq(struct a6xx_gmu *gmu, int index)
+void a6xx_gmu_set_freq(struct msm_gpu *gpu, struct dev_pm_opp *opp)
 {
-	struct a6xx_gpu *a6xx_gpu = container_of(gmu, struct a6xx_gpu, gmu);
-	struct adreno_gpu *adreno_gpu = &a6xx_gpu->base;
-	struct msm_gpu *gpu = &adreno_gpu->base;
-	int ret;
+	struct adreno_gpu *adreno_gpu = to_adreno_gpu(gpu);
+	struct a6xx_gpu *a6xx_gpu = to_a6xx_gpu(adreno_gpu);
+	struct a6xx_gmu *gmu = &a6xx_gpu->gmu;
+	u32 perf_index;
+	unsigned long gpu_freq;
+	int ret = 0;
+
+	gpu_freq = dev_pm_opp_get_freq(opp);
+
+	if (gpu_freq == gmu->freq)
+		return;
+
+	for (perf_index = 0; perf_index < gmu->nr_gpu_freqs - 1; perf_index++)
+		if (gpu_freq == gmu->gpu_freqs[perf_index])
+			break;
+
+	gmu->current_perf_index = perf_index;

 	gmu_write(gmu, REG_A6XX_GMU_DCVS_ACK_OPTION, 0);

 	gmu_write(gmu, REG_A6XX_GMU_DCVS_PERF_SETTING,
-		((3 & 0xf) << 28) | index);
+			((3 & 0xf) << 28) | perf_index);

 	/*
 	 * Send an invalid index as a vote for the bus bandwidth and let the
@@ -126,7 +139,7 @@ static void __a6xx_gmu_set_freq(struct a6xx_gmu *gmu, int index)
 	if (ret)
 		dev_err(gmu->dev, "GMU set GPU frequency error: %d\n", ret);

-	gmu->freq = gmu->gpu_freqs[index];
+	gmu->freq = gmu->gpu_freqs[perf_index];

 	/*
 	 * Eventually we will want to scale the path vote with the frequency but
@@ -135,25 +148,6 @@ static void __a6xx_gmu_set_freq(struct a6xx_gmu *gmu, int index)
 	icc_set_bw(gpu->icc_path, 0, MBps_to_icc(7216));
 }

-void a6xx_gmu_set_freq(struct msm_gpu *gpu, unsigned long freq)
-{
-	struct adreno_gpu *adreno_gpu = to_adreno_gpu(gpu);
-	struct a6xx_gpu *a6xx_gpu = to_a6xx_gpu(adreno_gpu);
-	struct a6xx_gmu *gmu = &a6xx_gpu->gmu;
-	u32 perf_index = 0;
-
-	if (freq == gmu->freq)
-		return;
-
-	for (perf_index = 0; perf_index < gmu->nr_gpu_freqs - 1; perf_index++)
-		if (freq == gmu->gpu_freqs[perf_index])
-			break;
-
-	gmu->current_perf_index = perf_index;
-
-	__a6xx_gmu_set_freq(gmu, perf_index);
-}
-
 unsigned long a6xx_gmu_get_freq(struct msm_gpu *gpu)
 {
 	struct adreno_gpu *adreno_gpu = to_adreno_gpu(gpu);
@@ -708,6 +702,19 @@ static void a6xx_gmu_force_off(struct a6xx_gmu *gmu)
 	a6xx_gmu_rpmh_off(gmu);
 }

+static void a6xx_gmu_set_initial_freq(struct msm_gpu *gpu, struct a6xx_gmu *gmu)
+{
+	struct dev_pm_opp *gpu_opp;
+	unsigned long gpu_freq = gmu->gpu_freqs[gmu->current_perf_index];
+
+	gpu_opp = dev_pm_opp_find_freq_exact(&gpu->pdev->dev, gpu_freq, true);
+	if (IS_ERR_OR_NULL(gpu_opp))
+		return;
+
+	a6xx_gmu_set_freq(gpu, gpu_opp);
+	dev_pm_opp_put(gpu_opp);
+}
+
 int a6xx_gmu_resume(struct a6xx_gpu *a6xx_gpu)
 {
 	struct adreno_gpu *adreno_gpu = &a6xx_gpu->base;
@@ -759,8 +766,7 @@ int a6xx_gmu_resume(struct a6xx_gpu *a6xx_gpu)
 	gmu_write(gmu, REG_A6XX_GMU_GMU2HOST_INTR_MASK, ~A6XX_HFI_IRQ_MASK);
 	enable_irq(gmu->hfi_irq);

-	/* Set the GPU to the current freq */
-	__a6xx_gmu_set_freq(gmu, gmu->current_perf_index);
+	a6xx_gmu_set_initial_freq(gpu, gmu);

 	/*
 	 * "enable" the GX power domain which won't actually do anything but it
diff --git a/drivers/gpu/drm/msm/adreno/a6xx_gpu.h b/drivers/gpu/drm/msm/adreno/a6xx_gpu.h
index 7239b8b..03ba60d 100644
--- a/drivers/gpu/drm/msm/adreno/a6xx_gpu.h
+++ b/drivers/gpu/drm/msm/adreno/a6xx_gpu.h
@@ -63,7 +63,7 @@ void a6xx_gmu_clear_oob(struct a6xx_gmu *gmu, enum a6xx_gmu_oob_state state);
 int a6xx_gmu_init(struct a6xx_gpu *a6xx_gpu, struct device_node *node);
 void a6xx_gmu_remove(struct a6xx_gpu *a6xx_gpu);

-void a6xx_gmu_set_freq(struct msm_gpu *gpu, unsigned long freq);
+void a6xx_gmu_set_freq(struct msm_gpu *gpu, struct dev_pm_opp *opp);
 unsigned long a6xx_gmu_get_freq(struct msm_gpu *gpu);

 void a6xx_show(struct msm_gpu *gpu, struct msm_gpu_state *state,
diff --git a/drivers/gpu/drm/msm/msm_gpu.c b/drivers/gpu/drm/msm/msm_gpu.c
index 615c5cd..82c3068 100644
--- a/drivers/gpu/drm/msm/msm_gpu.c
+++ b/drivers/gpu/drm/msm/msm_gpu.c
@@ -13,7 +13,6 @@

 #include <generated/utsrelease.h>
 #include <linux/string_helpers.h>
-#include <linux/pm_opp.h>
 #include <linux/devfreq.h>
 #include <linux/devcoredump.h>
 #include <linux/sched/task.h>
@@ -34,7 +33,7 @@ static int msm_devfreq_target(struct device *dev, unsigned long *freq,
 		return PTR_ERR(opp);

 	if (gpu->funcs->gpu_set_freq)
-		gpu->funcs->gpu_set_freq(gpu, (u64)*freq);
+		gpu->funcs->gpu_set_freq(gpu, opp);
 	else
 		clk_set_rate(gpu->core_clk, *freq);

diff --git a/drivers/gpu/drm/msm/msm_gpu.h b/drivers/gpu/drm/msm/msm_gpu.h
index ab8f0f9c..cf0dc6d 100644
--- a/drivers/gpu/drm/msm/msm_gpu.h
+++ b/drivers/gpu/drm/msm/msm_gpu.h
@@ -9,6 +9,7 @@

 #include <linux/clk.h>
 #include <linux/interconnect.h>
+#include <linux/pm_opp.h>
 #include <linux/regulator/consumer.h>

 #include "msm_drv.h"
@@ -63,7 +64,7 @@ struct msm_gpu_funcs {
 	struct msm_gpu_state *(*gpu_state_get)(struct msm_gpu *gpu);
 	int (*gpu_state_put)(struct msm_gpu_state *state);
 	unsigned long (*gpu_get_freq)(struct msm_gpu *gpu);
-	void (*gpu_set_freq)(struct msm_gpu *gpu, unsigned long freq);
+	void (*gpu_set_freq)(struct msm_gpu *gpu, struct dev_pm_opp *opp);
 };

 struct msm_gpu {
--
2.7.4

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Re: [PATCH v3 2/6] drm: msm: a6xx: send opp instead of a frequency

[Rob Clark]

On Fri, Jun 5, 2020 at 9:26 PM Sharat Masetty <smasetty@codeaurora.org> wrote:
>
> This patch changes the plumbing to send the devfreq recommended opp rather
> than the frequency. Also consolidate and rearrange the code in a6xx to set
> the GPU frequency and the icc vote in preparation for the upcoming
> changes for GPU->DDR scaling votes.
>
> Signed-off-by: Sharat Masetty <smasetty@codeaurora.org>
> ---
>  drivers/gpu/drm/msm/adreno/a6xx_gmu.c | 62 +++++++++++++++++++----------------
>  drivers/gpu/drm/msm/adreno/a6xx_gpu.h |  2 +-
>  drivers/gpu/drm/msm/msm_gpu.c         |  3 +-
>  drivers/gpu/drm/msm/msm_gpu.h         |  3 +-
>  4 files changed, 38 insertions(+), 32 deletions(-)
>
> diff --git a/drivers/gpu/drm/msm/adreno/a6xx_gmu.c b/drivers/gpu/drm/msm/adreno/a6xx_gmu.c
> index 748cd37..2d8124b 100644
> --- a/drivers/gpu/drm/msm/adreno/a6xx_gmu.c
> +++ b/drivers/gpu/drm/msm/adreno/a6xx_gmu.c
> @@ -100,17 +100,30 @@ bool a6xx_gmu_gx_is_on(struct a6xx_gmu *gmu)
>                 A6XX_GMU_SPTPRAC_PWR_CLK_STATUS_GX_HM_CLK_OFF));
>  }
>
> -static void __a6xx_gmu_set_freq(struct a6xx_gmu *gmu, int index)
> +void a6xx_gmu_set_freq(struct msm_gpu *gpu, struct dev_pm_opp *opp)
>  {
> -       struct a6xx_gpu *a6xx_gpu = container_of(gmu, struct a6xx_gpu, gmu);
> -       struct adreno_gpu *adreno_gpu = &a6xx_gpu->base;
> -       struct msm_gpu *gpu = &adreno_gpu->base;
> -       int ret;
> +       struct adreno_gpu *adreno_gpu = to_adreno_gpu(gpu);
> +       struct a6xx_gpu *a6xx_gpu = to_a6xx_gpu(adreno_gpu);
> +       struct a6xx_gmu *gmu = &a6xx_gpu->gmu;
> +       u32 perf_index;
> +       unsigned long gpu_freq;
> +       int ret = 0;
> +
> +       gpu_freq = dev_pm_opp_get_freq(opp);
> +
> +       if (gpu_freq == gmu->freq)
> +               return;
> +
> +       for (perf_index = 0; perf_index < gmu->nr_gpu_freqs - 1; perf_index++)
> +               if (gpu_freq == gmu->gpu_freqs[perf_index])
> +                       break;
> +
> +       gmu->current_perf_index = perf_index;
>
>         gmu_write(gmu, REG_A6XX_GMU_DCVS_ACK_OPTION, 0);
>
>         gmu_write(gmu, REG_A6XX_GMU_DCVS_PERF_SETTING,
> -               ((3 & 0xf) << 28) | index);
> +                       ((3 & 0xf) << 28) | perf_index);
>
>         /*
>          * Send an invalid index as a vote for the bus bandwidth and let the
> @@ -126,7 +139,7 @@ static void __a6xx_gmu_set_freq(struct a6xx_gmu *gmu, int index)
>         if (ret)
>                 dev_err(gmu->dev, "GMU set GPU frequency error: %d\n", ret);
>
> -       gmu->freq = gmu->gpu_freqs[index];
> +       gmu->freq = gmu->gpu_freqs[perf_index];
>
>         /*
>          * Eventually we will want to scale the path vote with the frequency but
> @@ -135,25 +148,6 @@ static void __a6xx_gmu_set_freq(struct a6xx_gmu *gmu, int index)
>         icc_set_bw(gpu->icc_path, 0, MBps_to_icc(7216));
>  }
>
> -void a6xx_gmu_set_freq(struct msm_gpu *gpu, unsigned long freq)
> -{
> -       struct adreno_gpu *adreno_gpu = to_adreno_gpu(gpu);
> -       struct a6xx_gpu *a6xx_gpu = to_a6xx_gpu(adreno_gpu);
> -       struct a6xx_gmu *gmu = &a6xx_gpu->gmu;
> -       u32 perf_index = 0;
> -
> -       if (freq == gmu->freq)
> -               return;
> -
> -       for (perf_index = 0; perf_index < gmu->nr_gpu_freqs - 1; perf_index++)
> -               if (freq == gmu->gpu_freqs[perf_index])
> -                       break;
> -
> -       gmu->current_perf_index = perf_index;
> -
> -       __a6xx_gmu_set_freq(gmu, perf_index);
> -}

this does end up conflicting a bit with some of the newer stuff that
landed this cycle, in particular "drm/msm/a6xx: HFI v2 for A640 and
A650"

Adding Jonathan on CC since I think he will want to test this on
a650/a640 as well..

BR,
-R

> -
>  unsigned long a6xx_gmu_get_freq(struct msm_gpu *gpu)
>  {
>         struct adreno_gpu *adreno_gpu = to_adreno_gpu(gpu);
> @@ -708,6 +702,19 @@ static void a6xx_gmu_force_off(struct a6xx_gmu *gmu)
>         a6xx_gmu_rpmh_off(gmu);
>  }
>
> +static void a6xx_gmu_set_initial_freq(struct msm_gpu *gpu, struct a6xx_gmu *gmu)
> +{
> +       struct dev_pm_opp *gpu_opp;
> +       unsigned long gpu_freq = gmu->gpu_freqs[gmu->current_perf_index];
> +
> +       gpu_opp = dev_pm_opp_find_freq_exact(&gpu->pdev->dev, gpu_freq, true);
> +       if (IS_ERR_OR_NULL(gpu_opp))
> +               return;
> +
> +       a6xx_gmu_set_freq(gpu, gpu_opp);
> +       dev_pm_opp_put(gpu_opp);
> +}
> +
>  int a6xx_gmu_resume(struct a6xx_gpu *a6xx_gpu)
>  {
>         struct adreno_gpu *adreno_gpu = &a6xx_gpu->base;
> @@ -759,8 +766,7 @@ int a6xx_gmu_resume(struct a6xx_gpu *a6xx_gpu)
>         gmu_write(gmu, REG_A6XX_GMU_GMU2HOST_INTR_MASK, ~A6XX_HFI_IRQ_MASK);
>         enable_irq(gmu->hfi_irq);
>
> -       /* Set the GPU to the current freq */
> -       __a6xx_gmu_set_freq(gmu, gmu->current_perf_index);
> +       a6xx_gmu_set_initial_freq(gpu, gmu);
>
>         /*
>          * "enable" the GX power domain which won't actually do anything but it
> diff --git a/drivers/gpu/drm/msm/adreno/a6xx_gpu.h b/drivers/gpu/drm/msm/adreno/a6xx_gpu.h
> index 7239b8b..03ba60d 100644
> --- a/drivers/gpu/drm/msm/adreno/a6xx_gpu.h
> +++ b/drivers/gpu/drm/msm/adreno/a6xx_gpu.h
> @@ -63,7 +63,7 @@ void a6xx_gmu_clear_oob(struct a6xx_gmu *gmu, enum a6xx_gmu_oob_state state);
>  int a6xx_gmu_init(struct a6xx_gpu *a6xx_gpu, struct device_node *node);
>  void a6xx_gmu_remove(struct a6xx_gpu *a6xx_gpu);
>
> -void a6xx_gmu_set_freq(struct msm_gpu *gpu, unsigned long freq);
> +void a6xx_gmu_set_freq(struct msm_gpu *gpu, struct dev_pm_opp *opp);
>  unsigned long a6xx_gmu_get_freq(struct msm_gpu *gpu);
>
>  void a6xx_show(struct msm_gpu *gpu, struct msm_gpu_state *state,
> diff --git a/drivers/gpu/drm/msm/msm_gpu.c b/drivers/gpu/drm/msm/msm_gpu.c
> index 615c5cd..82c3068 100644
> --- a/drivers/gpu/drm/msm/msm_gpu.c
> +++ b/drivers/gpu/drm/msm/msm_gpu.c
> @@ -13,7 +13,6 @@
>
>  #include <generated/utsrelease.h>
>  #include <linux/string_helpers.h>
> -#include <linux/pm_opp.h>
>  #include <linux/devfreq.h>
>  #include <linux/devcoredump.h>
>  #include <linux/sched/task.h>
> @@ -34,7 +33,7 @@ static int msm_devfreq_target(struct device *dev, unsigned long *freq,
>                 return PTR_ERR(opp);
>
>         if (gpu->funcs->gpu_set_freq)
> -               gpu->funcs->gpu_set_freq(gpu, (u64)*freq);
> +               gpu->funcs->gpu_set_freq(gpu, opp);
>         else
>                 clk_set_rate(gpu->core_clk, *freq);
>
> diff --git a/drivers/gpu/drm/msm/msm_gpu.h b/drivers/gpu/drm/msm/msm_gpu.h
> index ab8f0f9c..cf0dc6d 100644
> --- a/drivers/gpu/drm/msm/msm_gpu.h
> +++ b/drivers/gpu/drm/msm/msm_gpu.h
> @@ -9,6 +9,7 @@
>
>  #include <linux/clk.h>
>  #include <linux/interconnect.h>
> +#include <linux/pm_opp.h>
>  #include <linux/regulator/consumer.h>
>
>  #include "msm_drv.h"
> @@ -63,7 +64,7 @@ struct msm_gpu_funcs {
>         struct msm_gpu_state *(*gpu_state_get)(struct msm_gpu *gpu);
>         int (*gpu_state_put)(struct msm_gpu_state *state);
>         unsigned long (*gpu_get_freq)(struct msm_gpu *gpu);
> -       void (*gpu_set_freq)(struct msm_gpu *gpu, unsigned long freq);
> +       void (*gpu_set_freq)(struct msm_gpu *gpu, struct dev_pm_opp *opp);
>  };
>
>  struct msm_gpu {
> --
> 2.7.4
>
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Re: [PATCH v3 2/6] drm: msm: a6xx: send opp instead of a frequency

[Matthias Kaehlcke]

Hi,

On Thu, Jun 18, 2020 at 10:52:09AM -0700, Rob Clark wrote:
> On Fri, Jun 5, 2020 at 9:26 PM Sharat Masetty <smasetty@codeaurora.org> wrote:
> >
> > This patch changes the plumbing to send the devfreq recommended opp rather
> > than the frequency. Also consolidate and rearrange the code in a6xx to set
> > the GPU frequency and the icc vote in preparation for the upcoming
> > changes for GPU->DDR scaling votes.
> >
> > Signed-off-by: Sharat Masetty <smasetty@codeaurora.org>
> > ---
> >  drivers/gpu/drm/msm/adreno/a6xx_gmu.c | 62 +++++++++++++++++++----------------
> >  drivers/gpu/drm/msm/adreno/a6xx_gpu.h |  2 +-
> >  drivers/gpu/drm/msm/msm_gpu.c         |  3 +-
> >  drivers/gpu/drm/msm/msm_gpu.h         |  3 +-
> >  4 files changed, 38 insertions(+), 32 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/msm/adreno/a6xx_gmu.c b/drivers/gpu/drm/msm/adreno/a6xx_gmu.c
> > index 748cd37..2d8124b 100644
> > --- a/drivers/gpu/drm/msm/adreno/a6xx_gmu.c
> > +++ b/drivers/gpu/drm/msm/adreno/a6xx_gmu.c
> > @@ -100,17 +100,30 @@ bool a6xx_gmu_gx_is_on(struct a6xx_gmu *gmu)
> >                 A6XX_GMU_SPTPRAC_PWR_CLK_STATUS_GX_HM_CLK_OFF));
> >  }
> >
> > -static void __a6xx_gmu_set_freq(struct a6xx_gmu *gmu, int index)
> > +void a6xx_gmu_set_freq(struct msm_gpu *gpu, struct dev_pm_opp *opp)
> >  {
> > -       struct a6xx_gpu *a6xx_gpu = container_of(gmu, struct a6xx_gpu, gmu);
> > -       struct adreno_gpu *adreno_gpu = &a6xx_gpu->base;
> > -       struct msm_gpu *gpu = &adreno_gpu->base;
> > -       int ret;
> > +       struct adreno_gpu *adreno_gpu = to_adreno_gpu(gpu);
> > +       struct a6xx_gpu *a6xx_gpu = to_a6xx_gpu(adreno_gpu);
> > +       struct a6xx_gmu *gmu = &a6xx_gpu->gmu;
> > +       u32 perf_index;
> > +       unsigned long gpu_freq;
> > +       int ret = 0;
> > +
> > +       gpu_freq = dev_pm_opp_get_freq(opp);
> > +
> > +       if (gpu_freq == gmu->freq)
> > +               return;
> > +
> > +       for (perf_index = 0; perf_index < gmu->nr_gpu_freqs - 1; perf_index++)
> > +               if (gpu_freq == gmu->gpu_freqs[perf_index])
> > +                       break;
> > +
> > +       gmu->current_perf_index = perf_index;
> >
> >         gmu_write(gmu, REG_A6XX_GMU_DCVS_ACK_OPTION, 0);
> >
> >         gmu_write(gmu, REG_A6XX_GMU_DCVS_PERF_SETTING,
> > -               ((3 & 0xf) << 28) | index);
> > +                       ((3 & 0xf) << 28) | perf_index);
> >
> >         /*
> >          * Send an invalid index as a vote for the bus bandwidth and let the
> > @@ -126,7 +139,7 @@ static void __a6xx_gmu_set_freq(struct a6xx_gmu *gmu, int index)
> >         if (ret)
> >                 dev_err(gmu->dev, "GMU set GPU frequency error: %d\n", ret);
> >
> > -       gmu->freq = gmu->gpu_freqs[index];
> > +       gmu->freq = gmu->gpu_freqs[perf_index];
> >
> >         /*
> >          * Eventually we will want to scale the path vote with the frequency but
> > @@ -135,25 +148,6 @@ static void __a6xx_gmu_set_freq(struct a6xx_gmu *gmu, int index)
> >         icc_set_bw(gpu->icc_path, 0, MBps_to_icc(7216));
> >  }
> >
> > -void a6xx_gmu_set_freq(struct msm_gpu *gpu, unsigned long freq)
> > -{
> > -       struct adreno_gpu *adreno_gpu = to_adreno_gpu(gpu);
> > -       struct a6xx_gpu *a6xx_gpu = to_a6xx_gpu(adreno_gpu);
> > -       struct a6xx_gmu *gmu = &a6xx_gpu->gmu;
> > -       u32 perf_index = 0;
> > -
> > -       if (freq == gmu->freq)
> > -               return;
> > -
> > -       for (perf_index = 0; perf_index < gmu->nr_gpu_freqs - 1; perf_index++)
> > -               if (freq == gmu->gpu_freqs[perf_index])
> > -                       break;
> > -
> > -       gmu->current_perf_index = perf_index;
> > -
> > -       __a6xx_gmu_set_freq(gmu, perf_index);
> > -}
> 
> this does end up conflicting a bit with some of the newer stuff that
> landed this cycle, in particular "drm/msm/a6xx: HFI v2 for A640 and
> A650"
> 
> Adding Jonathan on CC since I think he will want to test this on
> a650/a640 as well..

Sharat, please send an updated version that is rebased on the latest drm-msm.

Thanks

Matthias
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[PATCH v3 3/6] drm: msm: a6xx: use dev_pm_opp_set_bw to scale DDR

[Sharat Masetty]

This patches replaces the previously used static DDR vote and uses
dev_pm_opp_set_bw() to scale GPU->DDR bandwidth along with scaling
GPU frequency. Also since the icc path voting is handled completely
in the opp driver, remove the icc_path handle and its usage in the
drm driver.

Signed-off-by: Sharat Masetty <smasetty@codeaurora.org>
---
 drivers/gpu/drm/msm/adreno/a6xx_gmu.c   | 23 ++++++++++++++++-------
 drivers/gpu/drm/msm/adreno/adreno_gpu.c |  8 --------
 drivers/gpu/drm/msm/msm_gpu.h           |  2 --
 3 files changed, 16 insertions(+), 17 deletions(-)

diff --git a/drivers/gpu/drm/msm/adreno/a6xx_gmu.c b/drivers/gpu/drm/msm/adreno/a6xx_gmu.c
index 2d8124b..1dd8fc5 100644
--- a/drivers/gpu/drm/msm/adreno/a6xx_gmu.c
+++ b/drivers/gpu/drm/msm/adreno/a6xx_gmu.c
@@ -141,11 +141,7 @@ void a6xx_gmu_set_freq(struct msm_gpu *gpu, struct dev_pm_opp *opp)

 	gmu->freq = gmu->gpu_freqs[perf_index];

-	/*
-	 * Eventually we will want to scale the path vote with the frequency but
-	 * for now leave it at max so that the performance is nominal.
-	 */
-	icc_set_bw(gpu->icc_path, 0, MBps_to_icc(7216));
+	dev_pm_opp_set_bw(&gpu->pdev->dev, opp);
 }

 unsigned long a6xx_gmu_get_freq(struct msm_gpu *gpu)
@@ -715,6 +711,19 @@ static void a6xx_gmu_set_initial_freq(struct msm_gpu *gpu, struct a6xx_gmu *gmu)
 	dev_pm_opp_put(gpu_opp);
 }

+static void a6xx_gmu_set_initial_bw(struct msm_gpu *gpu, struct a6xx_gmu *gmu)
+{
+	struct dev_pm_opp *gpu_opp;
+	unsigned long gpu_freq = gmu->gpu_freqs[gmu->current_perf_index];
+
+	gpu_opp = dev_pm_opp_find_freq_exact(&gpu->pdev->dev, gpu_freq, true);
+	if (IS_ERR_OR_NULL(gpu_opp))
+		return;
+
+	dev_pm_opp_set_bw(&gpu->pdev->dev, gpu_opp);
+	dev_pm_opp_put(gpu_opp);
+}
+
 int a6xx_gmu_resume(struct a6xx_gpu *a6xx_gpu)
 {
 	struct adreno_gpu *adreno_gpu = &a6xx_gpu->base;
@@ -739,7 +748,7 @@ int a6xx_gmu_resume(struct a6xx_gpu *a6xx_gpu)
 	}

 	/* Set the bus quota to a reasonable value for boot */
-	icc_set_bw(gpu->icc_path, 0, MBps_to_icc(3072));
+	a6xx_gmu_set_initial_bw(gpu, gmu);

 	/* Enable the GMU interrupt */
 	gmu_write(gmu, REG_A6XX_GMU_AO_HOST_INTERRUPT_CLR, ~0);
@@ -907,7 +916,7 @@ int a6xx_gmu_stop(struct a6xx_gpu *a6xx_gpu)
 		a6xx_gmu_shutdown(gmu);

 	/* Remove the bus vote */
-	icc_set_bw(gpu->icc_path, 0, 0);
+	dev_pm_opp_set_bw(&gpu->pdev->dev, NULL);

 	/*
 	 * Make sure the GX domain is off before turning off the GMU (CX)
diff --git a/drivers/gpu/drm/msm/adreno/adreno_gpu.c b/drivers/gpu/drm/msm/adreno/adreno_gpu.c
index 2d13694..718c705 100644
--- a/drivers/gpu/drm/msm/adreno/adreno_gpu.c
+++ b/drivers/gpu/drm/msm/adreno/adreno_gpu.c
@@ -913,11 +913,6 @@ static int adreno_get_pwrlevels(struct device *dev,

 	DBG("fast_rate=%u, slow_rate=27000000", gpu->fast_rate);

-	/* Check for an interconnect path for the bus */
-	gpu->icc_path = of_icc_get(dev, NULL);
-	if (IS_ERR(gpu->icc_path))
-		gpu->icc_path = NULL;
-
 	return 0;
 }

@@ -958,13 +953,10 @@ int adreno_gpu_init(struct drm_device *drm, struct platform_device *pdev,

 void adreno_gpu_cleanup(struct adreno_gpu *adreno_gpu)
 {
-	struct msm_gpu *gpu = &adreno_gpu->base;
 	unsigned int i;

 	for (i = 0; i < ARRAY_SIZE(adreno_gpu->info->fw); i++)
 		release_firmware(adreno_gpu->fw[i]);

-	icc_put(gpu->icc_path);
-
 	msm_gpu_cleanup(&adreno_gpu->base);
 }
diff --git a/drivers/gpu/drm/msm/msm_gpu.h b/drivers/gpu/drm/msm/msm_gpu.h
index cf0dc6d..c7d74a9 100644
--- a/drivers/gpu/drm/msm/msm_gpu.h
+++ b/drivers/gpu/drm/msm/msm_gpu.h
@@ -112,8 +112,6 @@ struct msm_gpu {
 	struct clk *ebi1_clk, *core_clk, *rbbmtimer_clk;
 	uint32_t fast_rate;

-	struct icc_path *icc_path;
-
 	/* Hang and Inactivity Detection:
 	 */
 #define DRM_MSM_INACTIVE_PERIOD   66 /* in ms (roughly four frames) */
--
2.7.4

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[PATCH v3 4/6] arm64: dts: qcom: SDM845: Enable GPU DDR bw scaling

[Sharat Masetty]

This patch adds the interconnects property for the gpu node and the
opp-peak-kBps property to the opps of the gpu opp table. This should
help enable DDR bandwidth scaling dynamically and proportionally to the
GPU frequency.

Signed-off-by: Sharat Masetty <smasetty@codeaurora.org>
---
 arch/arm64/boot/dts/qcom/sdm845.dtsi | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/arch/arm64/boot/dts/qcom/sdm845.dtsi b/arch/arm64/boot/dts/qcom/sdm845.dtsi
index 11fc3f24..6ea6f54 100644
--- a/arch/arm64/boot/dts/qcom/sdm845.dtsi
+++ b/arch/arm64/boot/dts/qcom/sdm845.dtsi
@@ -3240,6 +3240,8 @@

 			qcom,gmu = <&gmu>;

+			interconnects = <&mem_noc MASTER_GFX3D &mem_noc SLAVE_EBI1>;
+
 			zap_shader: zap-shader {
 				memory-region = <&gpu_mem>;
 			};
@@ -3250,36 +3252,43 @@
 				opp-710000000 {
 					opp-hz = /bits/ 64 <710000000>;
 					opp-level = <RPMH_REGULATOR_LEVEL_TURBO_L1>;
+					opp-peak-kBps = <7216000>;
 				};

 				opp-675000000 {
 					opp-hz = /bits/ 64 <675000000>;
 					opp-level = <RPMH_REGULATOR_LEVEL_TURBO>;
+					opp-peak-kBps = <7216000>;
 				};

 				opp-596000000 {
 					opp-hz = /bits/ 64 <596000000>;
 					opp-level = <RPMH_REGULATOR_LEVEL_NOM_L1>;
+					opp-peak-kBps = <6220000>;
 				};

 				opp-520000000 {
 					opp-hz = /bits/ 64 <520000000>;
 					opp-level = <RPMH_REGULATOR_LEVEL_NOM>;
+					opp-peak-kBps = <6220000>;
 				};

 				opp-414000000 {
 					opp-hz = /bits/ 64 <414000000>;
 					opp-level = <RPMH_REGULATOR_LEVEL_SVS_L1>;
+					opp-peak-kBps = <4068000>;
 				};

 				opp-342000000 {
 					opp-hz = /bits/ 64 <342000000>;
 					opp-level = <RPMH_REGULATOR_LEVEL_SVS>;
+					opp-peak-kBps = <2724000>;
 				};

 				opp-257000000 {
 					opp-hz = /bits/ 64 <257000000>;
 					opp-level = <RPMH_REGULATOR_LEVEL_LOW_SVS>;
+					opp-peak-kBps = <1648000>;
 				};
 			};
 		};
--
2.7.4

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[PATCH v3 5/6] arm64: dts: qcom: sc7180: Add interconnects property for GPU

[Sharat Masetty]

This patch adds the interconnects property to the GPU node. This enables
the GPU->DDR path bandwidth voting.

Signed-off-by: Sharat Masetty <smasetty@codeaurora.org>
---
 arch/arm64/boot/dts/qcom/sc7180.dtsi | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/arm64/boot/dts/qcom/sc7180.dtsi b/arch/arm64/boot/dts/qcom/sc7180.dtsi
index eaede5e..34004ad 100644
--- a/arch/arm64/boot/dts/qcom/sc7180.dtsi
+++ b/arch/arm64/boot/dts/qcom/sc7180.dtsi
@@ -1497,6 +1497,8 @@
 			operating-points-v2 = <&gpu_opp_table>;
 			qcom,gmu = <&gmu>;

+			interconnects = <&gem_noc MASTER_GFX3D &mc_virt SLAVE_EBI1>;
+
 			gpu_opp_table: opp-table {
 				compatible = "operating-points-v2";

--
2.7.4

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[PATCH v3 6/6] arm64: dts: qcom: sc7180: Add opp-peak-kBps to GPU opp

[Sharat Masetty]

Add opp-peak-kBps bindings to the GPU opp table, listing the peak
GPU -> DDR bandwidth requirement for each opp level. This will be
used to scale the DDR bandwidth along with the GPU frequency dynamically.

Signed-off-by: Sharat Masetty <smasetty@codeaurora.org>
Reviewed-by: Matthias Kaehlcke <mka@chromium.org>
---
 arch/arm64/boot/dts/qcom/sc7180.dtsi | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/arch/arm64/boot/dts/qcom/sc7180.dtsi b/arch/arm64/boot/dts/qcom/sc7180.dtsi
index 34004ad..7bef42b 100644
--- a/arch/arm64/boot/dts/qcom/sc7180.dtsi
+++ b/arch/arm64/boot/dts/qcom/sc7180.dtsi
@@ -1505,36 +1505,43 @@
 				opp-800000000 {
 					opp-hz = /bits/ 64 <800000000>;
 					opp-level = <RPMH_REGULATOR_LEVEL_TURBO>;
+					opp-peak-kBps = <8532000>;
 				};

 				opp-650000000 {
 					opp-hz = /bits/ 64 <650000000>;
 					opp-level = <RPMH_REGULATOR_LEVEL_NOM_L1>;
+					opp-peak-kBps = <7216000>;
 				};

 				opp-565000000 {
 					opp-hz = /bits/ 64 <565000000>;
 					opp-level = <RPMH_REGULATOR_LEVEL_NOM>;
+					opp-peak-kBps = <5412000>;
 				};

 				opp-430000000 {
 					opp-hz = /bits/ 64 <430000000>;
 					opp-level = <RPMH_REGULATOR_LEVEL_SVS_L1>;
+					opp-peak-kBps = <5412000>;
 				};

 				opp-355000000 {
 					opp-hz = /bits/ 64 <355000000>;
 					opp-level = <RPMH_REGULATOR_LEVEL_SVS>;
+					opp-peak-kBps = <3072000>;
 				};

 				opp-267000000 {
 					opp-hz = /bits/ 64 <267000000>;
 					opp-level = <RPMH_REGULATOR_LEVEL_LOW_SVS>;
+					opp-peak-kBps = <3072000>;
 				};

 				opp-180000000 {
 					opp-hz = /bits/ 64 <180000000>;
 					opp-level = <RPMH_REGULATOR_LEVEL_MIN_SVS>;
+					opp-peak-kBps = <1804000>;
 				};
 			};
 		};
--
2.7.4

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Re: [PATCH v3 0/6] Add support for GPU DDR BW scaling

[Viresh Kumar]

On 06-06-20, 09:55, Sharat Masetty wrote:
> This is a respin of [1]. Incorported review feedback and fixed issues observed
> during testing. Picked up the Georgi's series from opp/linux-next [2], and this
> series is also dependent on a helper function needed to set and clear ddr
> bandwidth vote [3]. Patch number 4 in the series adds support for SDM845 as well
> but its not tested yet(WIP), but the SC7180 patches are well tested now.
> 
> [1] https://patchwork.freedesktop.org/series/75291/
> [2] https://kernel.googlesource.com/pub/scm/linux/kernel/git/vireshk/pm/+log/opp/linux-next/
> [3] https://patchwork.kernel.org/patch/11590563/

Had a quick look of the series and looked mostly fine to me.

-- 
viresh
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