[PATCH] drm/msm/a6xx: don't try to set GPU frequency when GMU is suspended

[PATCH] drm/msm/a6xx: don't try to set GPU frequency when GMU is suspended

[Jonathan Marek]

This fixes changing the frequency in sysfs while suspended, for example
when doing something like this:

cat devfreq/3d00000.gpu/max_freq > devfreq/3d00000.gpu/min_freq

Signed-off-by: Jonathan Marek <jonathan@marek.ca>
---
 drivers/gpu/drm/msm/adreno/a6xx_gmu.c | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/msm/adreno/a6xx_gmu.c b/drivers/gpu/drm/msm/adreno/a6xx_gmu.c
index aec54cde8534..9498803dcad9 100644
--- a/drivers/gpu/drm/msm/adreno/a6xx_gmu.c
+++ b/drivers/gpu/drm/msm/adreno/a6xx_gmu.c
@@ -151,13 +151,20 @@ void a6xx_gmu_set_freq(struct msm_gpu *gpu, unsigned long freq)
 			break;
 
 	gmu->current_perf_index = perf_index;
+	gmu->freq = gmu->gpu_freqs[perf_index];
+
+	/*
+	 * devfreq may try to change frequency target even when suspended
+	 * this can happen when changing frequency through sysfs
+	 * don't try to set freq when suspended, it will be set on resume
+	 */
+	if (!pm_runtime_active(gmu->dev))
+		return;
 
 	if (gmu->legacy)
 		__a6xx_gmu_set_freq(gmu, perf_index);
 	else
 		a6xx_hfi_set_freq(gmu, perf_index);
-
-	gmu->freq = gmu->gpu_freqs[perf_index];
 }
 
 unsigned long a6xx_gmu_get_freq(struct msm_gpu *gpu)
-- 
2.26.1

Re: [PATCH] drm/msm/a6xx: don't try to set GPU frequency when GMU is suspended

[Jordan Crouse]

On Mon, May 18, 2020 at 11:07:33PM -0400, Jonathan Marek wrote:
> This fixes changing the frequency in sysfs while suspended, for example
> when doing something like this:
> 
> cat devfreq/3d00000.gpu/max_freq > devfreq/3d00000.gpu/min_freq

A patch landed to fix this [1] but it crossed paths in the night with the
a640/a650 support. Can you respin this to move the pm_runtime_get_if_in_use()
check in _a6xx_gmu_set_freq() to the higher level function and then we should
be covered.

Thanks,
Jordan

[1] https://patchwork.freedesktop.org/patch/364089/?series=76829&rev=3

> Signed-off-by: Jonathan Marek <jonathan@marek.ca>
> ---
>  drivers/gpu/drm/msm/adreno/a6xx_gmu.c | 11 +++++++++--
>  1 file changed, 9 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/gpu/drm/msm/adreno/a6xx_gmu.c b/drivers/gpu/drm/msm/adreno/a6xx_gmu.c
> index aec54cde8534..9498803dcad9 100644
> --- a/drivers/gpu/drm/msm/adreno/a6xx_gmu.c
> +++ b/drivers/gpu/drm/msm/adreno/a6xx_gmu.c
> @@ -151,13 +151,20 @@ void a6xx_gmu_set_freq(struct msm_gpu *gpu, unsigned long freq)
>  			break;
>  
>  	gmu->current_perf_index = perf_index;
> +	gmu->freq = gmu->gpu_freqs[perf_index];
> +
> +	/*
> +	 * devfreq may try to change frequency target even when suspended
> +	 * this can happen when changing frequency through sysfs
> +	 * don't try to set freq when suspended, it will be set on resume
> +	 */
> +	if (!pm_runtime_active(gmu->dev))
> +		return;
>  
>  	if (gmu->legacy)
>  		__a6xx_gmu_set_freq(gmu, perf_index);
>  	else
>  		a6xx_hfi_set_freq(gmu, perf_index);
> -
> -	gmu->freq = gmu->gpu_freqs[perf_index];
>  }
>  
>  unsigned long a6xx_gmu_get_freq(struct msm_gpu *gpu)
> -- 
> 2.26.1
> 

-- 
The Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum,
a Linux Foundation Collaborative Project

[PATCH v2] drm/msm/a6xx: skip HFI set freq if GMU is powered down

[Jonathan Marek]

Also skip the newly added HFI set freq path if the GMU is powered down,
which was missing because of patches crossing paths.

Signed-off-by: Jonathan Marek <jonathan@marek.ca>
---
 drivers/gpu/drm/msm/adreno/a6xx_gmu.c | 18 +++++++++---------
 1 file changed, 9 insertions(+), 9 deletions(-)

diff --git a/drivers/gpu/drm/msm/adreno/a6xx_gmu.c b/drivers/gpu/drm/msm/adreno/a6xx_gmu.c
index 67c58345b26a..9851367a88cd 100644
--- a/drivers/gpu/drm/msm/adreno/a6xx_gmu.c
+++ b/drivers/gpu/drm/msm/adreno/a6xx_gmu.c
@@ -110,13 +110,6 @@ static void __a6xx_gmu_set_freq(struct a6xx_gmu *gmu, int index)
 	struct msm_gpu *gpu = &adreno_gpu->base;
 	int ret;
 
-	/*
-	 * This can get called from devfreq while the hardware is idle. Don't
-	 * bring up the power if it isn't already active
-	 */
-	if (pm_runtime_get_if_in_use(gmu->dev) == 0)
-		return;
-
 	gmu_write(gmu, REG_A6XX_GMU_DCVS_ACK_OPTION, 0);
 
 	gmu_write(gmu, REG_A6XX_GMU_DCVS_PERF_SETTING,
@@ -141,7 +134,6 @@ static void __a6xx_gmu_set_freq(struct a6xx_gmu *gmu, int index)
 	 * for now leave it at max so that the performance is nominal.
 	 */
 	icc_set_bw(gpu->icc_path, 0, MBps_to_icc(7216));
-	pm_runtime_put(gmu->dev);
 }
 
 void a6xx_gmu_set_freq(struct msm_gpu *gpu, unsigned long freq)
@@ -159,13 +151,21 @@ void a6xx_gmu_set_freq(struct msm_gpu *gpu, unsigned long freq)
 			break;
 
 	gmu->current_perf_index = perf_index;
+	gmu->freq = gmu->gpu_freqs[perf_index];
+
+	/*
+	 * This can get called from devfreq while the hardware is idle. Don't
+	 * bring up the power if it isn't already active
+	 */
+	if (pm_runtime_get_if_in_use(gmu->dev) == 0)
+		return;
 
 	if (gmu->legacy)
 		__a6xx_gmu_set_freq(gmu, perf_index);
 	else
 		a6xx_hfi_set_freq(gmu, perf_index);
 
-	gmu->freq = gmu->gpu_freqs[perf_index];
+	pm_runtime_put(gmu->dev);
 }
 
 unsigned long a6xx_gmu_get_freq(struct msm_gpu *gpu)
-- 
2.26.1

Re: [PATCH v2] drm/msm/a6xx: skip HFI set freq if GMU is powered down

[Jordan Crouse]

On Fri, May 22, 2020 at 06:29:08PM -0400, Jonathan Marek wrote:
> Also skip the newly added HFI set freq path if the GMU is powered down,
> which was missing because of patches crossing paths.

I saw the 5.8 pull later in my inbox so I'm not sure if this made it or not but
it qualifies as a -fix if it didn't.

Reviewed-by: Jordan Crouse <jcrouse@codeaurora.org>

> Signed-off-by: Jonathan Marek <jonathan@marek.ca>
> ---
>  drivers/gpu/drm/msm/adreno/a6xx_gmu.c | 18 +++++++++---------
>  1 file changed, 9 insertions(+), 9 deletions(-)
> 
> diff --git a/drivers/gpu/drm/msm/adreno/a6xx_gmu.c b/drivers/gpu/drm/msm/adreno/a6xx_gmu.c
> index 67c58345b26a..9851367a88cd 100644
> --- a/drivers/gpu/drm/msm/adreno/a6xx_gmu.c
> +++ b/drivers/gpu/drm/msm/adreno/a6xx_gmu.c
> @@ -110,13 +110,6 @@ static void __a6xx_gmu_set_freq(struct a6xx_gmu *gmu, int index)
>  	struct msm_gpu *gpu = &adreno_gpu->base;
>  	int ret;
>  
> -	/*
> -	 * This can get called from devfreq while the hardware is idle. Don't
> -	 * bring up the power if it isn't already active
> -	 */
> -	if (pm_runtime_get_if_in_use(gmu->dev) == 0)
> -		return;
> -
>  	gmu_write(gmu, REG_A6XX_GMU_DCVS_ACK_OPTION, 0);
>  
>  	gmu_write(gmu, REG_A6XX_GMU_DCVS_PERF_SETTING,
> @@ -141,7 +134,6 @@ static void __a6xx_gmu_set_freq(struct a6xx_gmu *gmu, int index)
>  	 * for now leave it at max so that the performance is nominal.
>  	 */
>  	icc_set_bw(gpu->icc_path, 0, MBps_to_icc(7216));
> -	pm_runtime_put(gmu->dev);
>  }
>  
>  void a6xx_gmu_set_freq(struct msm_gpu *gpu, unsigned long freq)
> @@ -159,13 +151,21 @@ void a6xx_gmu_set_freq(struct msm_gpu *gpu, unsigned long freq)
>  			break;
>  
>  	gmu->current_perf_index = perf_index;
> +	gmu->freq = gmu->gpu_freqs[perf_index];
> +
> +	/*
> +	 * This can get called from devfreq while the hardware is idle. Don't
> +	 * bring up the power if it isn't already active
> +	 */
> +	if (pm_runtime_get_if_in_use(gmu->dev) == 0)
> +		return;
>  
>  	if (gmu->legacy)
>  		__a6xx_gmu_set_freq(gmu, perf_index);
>  	else
>  		a6xx_hfi_set_freq(gmu, perf_index);
>  
> -	gmu->freq = gmu->gpu_freqs[perf_index];
> +	pm_runtime_put(gmu->dev);
>  }
>  
>  unsigned long a6xx_gmu_get_freq(struct msm_gpu *gpu)
> -- 
> 2.26.1
> 

-- 
The Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum,
a Linux Foundation Collaborative Project