[v2] drm/msm: handle for EPROBE_DEFER for of_icc_get
diff mbox series

Message ID 20200709143404.11876-1-jonathan@marek.ca
State New
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Series
  • [v2] drm/msm: handle for EPROBE_DEFER for of_icc_get
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Commit Message

Jonathan Marek July 9, 2020, 2:34 p.m. UTC
Check for errors instead of silently not using icc if the msm driver
probes before the interconnect driver.

Allow ENODATA for ocmem path, as it is optional and this error
is returned when "gfx-mem" path is provided but not "ocmem".

Remove the WARN_ON in msm_gpu_cleanup because INIT_LIST_HEAD won't have
been called on the list yet when going through the defer error path.

Changes in v2:
* Changed to not only check for EPROBE_DEFER

Signed-off-by: Jonathan Marek <jonathan@marek.ca>
---
 drivers/gpu/drm/msm/adreno/adreno_gpu.c | 17 ++++++++++++++---
 drivers/gpu/drm/msm/msm_gpu.c           |  2 --
 2 files changed, 14 insertions(+), 5 deletions(-)

Comments

Jonathan Marek July 10, 2020, 11:10 p.m. UTC | #1
On 7/9/20 11:15 AM, Rob Clark wrote:
> On Thu, Jul 9, 2020 at 7:35 AM Jonathan Marek <jonathan@marek.ca> wrote:
>>
>> Check for errors instead of silently not using icc if the msm driver
>> probes before the interconnect driver.
>>
>> Allow ENODATA for ocmem path, as it is optional and this error
>> is returned when "gfx-mem" path is provided but not "ocmem".
>>
>> Remove the WARN_ON in msm_gpu_cleanup because INIT_LIST_HEAD won't have
>> been called on the list yet when going through the defer error path.
>>
>> Changes in v2:
>> * Changed to not only check for EPROBE_DEFER
>>
>> Signed-off-by: Jonathan Marek <jonathan@marek.ca>
>> ---
>>   drivers/gpu/drm/msm/adreno/adreno_gpu.c | 17 ++++++++++++++---
>>   drivers/gpu/drm/msm/msm_gpu.c           |  2 --
>>   2 files changed, 14 insertions(+), 5 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/msm/adreno/adreno_gpu.c b/drivers/gpu/drm/msm/adreno/adreno_gpu.c
>> index 89673c7ed473..0f5217202eb5 100644
>> --- a/drivers/gpu/drm/msm/adreno/adreno_gpu.c
>> +++ b/drivers/gpu/drm/msm/adreno/adreno_gpu.c
>> @@ -940,12 +940,20 @@ static int adreno_get_pwrlevels(struct device *dev,
>>                   */
>>                  gpu->icc_path = of_icc_get(dev, NULL);
>>          }
>> -       if (IS_ERR(gpu->icc_path))
>> +       if (IS_ERR(gpu->icc_path)) {
>> +               ret = PTR_ERR(gpu->icc_path);
>>                  gpu->icc_path = NULL;
>> +               return ret;
>> +       }
>>
>>          gpu->ocmem_icc_path = of_icc_get(dev, "ocmem");
>> -       if (IS_ERR(gpu->ocmem_icc_path))
>> +       if (IS_ERR(gpu->ocmem_icc_path)) {
>> +               ret = PTR_ERR(gpu->ocmem_icc_path);
>>                  gpu->ocmem_icc_path = NULL;
>> +               /* allow -ENODATA, ocmem icc is optional */
>> +               if (ret != -ENODATA)
>> +                       return ret;
>> +       }
>>
>>          return 0;
>>   }
>> @@ -996,6 +1004,7 @@ int adreno_gpu_init(struct drm_device *drm, struct platform_device *pdev,
>>          struct adreno_platform_config *config = pdev->dev.platform_data;
>>          struct msm_gpu_config adreno_gpu_config  = { 0 };
>>          struct msm_gpu *gpu = &adreno_gpu->base;
>> +       int ret;
>>
>>          adreno_gpu->funcs = funcs;
>>          adreno_gpu->info = adreno_info(config->rev);
>> @@ -1007,7 +1016,9 @@ int adreno_gpu_init(struct drm_device *drm, struct platform_device *pdev,
>>
>>          adreno_gpu_config.nr_rings = nr_rings;
>>
>> -       adreno_get_pwrlevels(&pdev->dev, gpu);
>> +       ret = adreno_get_pwrlevels(&pdev->dev, gpu);
>> +       if (ret)
>> +               return ret;
>>
>>          pm_runtime_set_autosuspend_delay(&pdev->dev,
>>                  adreno_gpu->info->inactive_period);
>> diff --git a/drivers/gpu/drm/msm/msm_gpu.c b/drivers/gpu/drm/msm/msm_gpu.c
>> index a22d30622306..ccf9a0dd9706 100644
>> --- a/drivers/gpu/drm/msm/msm_gpu.c
>> +++ b/drivers/gpu/drm/msm/msm_gpu.c
>> @@ -959,8 +959,6 @@ void msm_gpu_cleanup(struct msm_gpu *gpu)
>>
>>          DBG("%s", gpu->name);
>>
>> -       WARN_ON(!list_empty(&gpu->active_list));
>> -
> 
> hmm, not a huge fan of removing the WARN_ON().. can we just init the
> list head earlier?
> 

There doesn't seem to be a nice way of doing that. Would it be 
reasonable to instead detect that msm_gpu_init wasn't called (checking 
if gpu->dev is NULL?), and just skip the msm_gpu_cleanup() call in 
adreno_gpu_cleanup() in that case?

> BR,
> -R
> 
>>          for (i = 0; i < ARRAY_SIZE(gpu->rb); i++) {
>>                  msm_ringbuffer_destroy(gpu->rb[i]);
>>                  gpu->rb[i] = NULL;
>> --
>> 2.26.1
>>
Rob Clark July 10, 2020, 11:29 p.m. UTC | #2
On Fri, Jul 10, 2020 at 4:11 PM Jonathan Marek <jonathan@marek.ca> wrote:
>
> On 7/9/20 11:15 AM, Rob Clark wrote:
> > On Thu, Jul 9, 2020 at 7:35 AM Jonathan Marek <jonathan@marek.ca> wrote:
> >>
> >> Check for errors instead of silently not using icc if the msm driver
> >> probes before the interconnect driver.
> >>
> >> Allow ENODATA for ocmem path, as it is optional and this error
> >> is returned when "gfx-mem" path is provided but not "ocmem".
> >>
> >> Remove the WARN_ON in msm_gpu_cleanup because INIT_LIST_HEAD won't have
> >> been called on the list yet when going through the defer error path.
> >>
> >> Changes in v2:
> >> * Changed to not only check for EPROBE_DEFER
> >>
> >> Signed-off-by: Jonathan Marek <jonathan@marek.ca>
> >> ---
> >>   drivers/gpu/drm/msm/adreno/adreno_gpu.c | 17 ++++++++++++++---
> >>   drivers/gpu/drm/msm/msm_gpu.c           |  2 --
> >>   2 files changed, 14 insertions(+), 5 deletions(-)
> >>
> >> diff --git a/drivers/gpu/drm/msm/adreno/adreno_gpu.c b/drivers/gpu/drm/msm/adreno/adreno_gpu.c
> >> index 89673c7ed473..0f5217202eb5 100644
> >> --- a/drivers/gpu/drm/msm/adreno/adreno_gpu.c
> >> +++ b/drivers/gpu/drm/msm/adreno/adreno_gpu.c
> >> @@ -940,12 +940,20 @@ static int adreno_get_pwrlevels(struct device *dev,
> >>                   */
> >>                  gpu->icc_path = of_icc_get(dev, NULL);
> >>          }
> >> -       if (IS_ERR(gpu->icc_path))
> >> +       if (IS_ERR(gpu->icc_path)) {
> >> +               ret = PTR_ERR(gpu->icc_path);
> >>                  gpu->icc_path = NULL;
> >> +               return ret;
> >> +       }
> >>
> >>          gpu->ocmem_icc_path = of_icc_get(dev, "ocmem");
> >> -       if (IS_ERR(gpu->ocmem_icc_path))
> >> +       if (IS_ERR(gpu->ocmem_icc_path)) {
> >> +               ret = PTR_ERR(gpu->ocmem_icc_path);
> >>                  gpu->ocmem_icc_path = NULL;
> >> +               /* allow -ENODATA, ocmem icc is optional */
> >> +               if (ret != -ENODATA)
> >> +                       return ret;
> >> +       }
> >>
> >>          return 0;
> >>   }
> >> @@ -996,6 +1004,7 @@ int adreno_gpu_init(struct drm_device *drm, struct platform_device *pdev,
> >>          struct adreno_platform_config *config = pdev->dev.platform_data;
> >>          struct msm_gpu_config adreno_gpu_config  = { 0 };
> >>          struct msm_gpu *gpu = &adreno_gpu->base;
> >> +       int ret;
> >>
> >>          adreno_gpu->funcs = funcs;
> >>          adreno_gpu->info = adreno_info(config->rev);
> >> @@ -1007,7 +1016,9 @@ int adreno_gpu_init(struct drm_device *drm, struct platform_device *pdev,
> >>
> >>          adreno_gpu_config.nr_rings = nr_rings;
> >>
> >> -       adreno_get_pwrlevels(&pdev->dev, gpu);
> >> +       ret = adreno_get_pwrlevels(&pdev->dev, gpu);
> >> +       if (ret)
> >> +               return ret;
> >>
> >>          pm_runtime_set_autosuspend_delay(&pdev->dev,
> >>                  adreno_gpu->info->inactive_period);
> >> diff --git a/drivers/gpu/drm/msm/msm_gpu.c b/drivers/gpu/drm/msm/msm_gpu.c
> >> index a22d30622306..ccf9a0dd9706 100644
> >> --- a/drivers/gpu/drm/msm/msm_gpu.c
> >> +++ b/drivers/gpu/drm/msm/msm_gpu.c
> >> @@ -959,8 +959,6 @@ void msm_gpu_cleanup(struct msm_gpu *gpu)
> >>
> >>          DBG("%s", gpu->name);
> >>
> >> -       WARN_ON(!list_empty(&gpu->active_list));
> >> -
> >
> > hmm, not a huge fan of removing the WARN_ON().. can we just init the
> > list head earlier?
> >
>
> There doesn't seem to be a nice way of doing that. Would it be
> reasonable to instead detect that msm_gpu_init wasn't called (checking
> if gpu->dev is NULL?), and just skip the msm_gpu_cleanup() call in
> adreno_gpu_cleanup() in that case?

Hmm, you can't just call msm_gpu_init() before looking up the icc path
in adreno_gpu_init()?

BR,
-R

>
> > BR,
> > -R
> >
> >>          for (i = 0; i < ARRAY_SIZE(gpu->rb); i++) {
> >>                  msm_ringbuffer_destroy(gpu->rb[i]);
> >>                  gpu->rb[i] = NULL;
> >> --
> >> 2.26.1
> >>

Patch
diff mbox series

diff --git a/drivers/gpu/drm/msm/adreno/adreno_gpu.c b/drivers/gpu/drm/msm/adreno/adreno_gpu.c
index 89673c7ed473..0f5217202eb5 100644
--- a/drivers/gpu/drm/msm/adreno/adreno_gpu.c
+++ b/drivers/gpu/drm/msm/adreno/adreno_gpu.c
@@ -940,12 +940,20 @@  static int adreno_get_pwrlevels(struct device *dev,
 		 */
 		gpu->icc_path = of_icc_get(dev, NULL);
 	}
-	if (IS_ERR(gpu->icc_path))
+	if (IS_ERR(gpu->icc_path)) {
+		ret = PTR_ERR(gpu->icc_path);
 		gpu->icc_path = NULL;
+		return ret;
+	}
 
 	gpu->ocmem_icc_path = of_icc_get(dev, "ocmem");
-	if (IS_ERR(gpu->ocmem_icc_path))
+	if (IS_ERR(gpu->ocmem_icc_path)) {
+		ret = PTR_ERR(gpu->ocmem_icc_path);
 		gpu->ocmem_icc_path = NULL;
+		/* allow -ENODATA, ocmem icc is optional */
+		if (ret != -ENODATA)
+			return ret;
+	}
 
 	return 0;
 }
@@ -996,6 +1004,7 @@  int adreno_gpu_init(struct drm_device *drm, struct platform_device *pdev,
 	struct adreno_platform_config *config = pdev->dev.platform_data;
 	struct msm_gpu_config adreno_gpu_config  = { 0 };
 	struct msm_gpu *gpu = &adreno_gpu->base;
+	int ret;
 
 	adreno_gpu->funcs = funcs;
 	adreno_gpu->info = adreno_info(config->rev);
@@ -1007,7 +1016,9 @@  int adreno_gpu_init(struct drm_device *drm, struct platform_device *pdev,
 
 	adreno_gpu_config.nr_rings = nr_rings;
 
-	adreno_get_pwrlevels(&pdev->dev, gpu);
+	ret = adreno_get_pwrlevels(&pdev->dev, gpu);
+	if (ret)
+		return ret;
 
 	pm_runtime_set_autosuspend_delay(&pdev->dev,
 		adreno_gpu->info->inactive_period);
diff --git a/drivers/gpu/drm/msm/msm_gpu.c b/drivers/gpu/drm/msm/msm_gpu.c
index a22d30622306..ccf9a0dd9706 100644
--- a/drivers/gpu/drm/msm/msm_gpu.c
+++ b/drivers/gpu/drm/msm/msm_gpu.c
@@ -959,8 +959,6 @@  void msm_gpu_cleanup(struct msm_gpu *gpu)
 
 	DBG("%s", gpu->name);
 
-	WARN_ON(!list_empty(&gpu->active_list));
-
 	for (i = 0; i < ARRAY_SIZE(gpu->rb); i++) {
 		msm_ringbuffer_destroy(gpu->rb[i]);
 		gpu->rb[i] = NULL;