WARN_ON was introduced by the below commit to catch runtime resumes
that are getting triggered before icc path was set.
"drm/msm/disp/dpu1: icc path needs to be set before dpu runtime resume"
For the targets where the bw scaling is not enabled, this WARN_ON is
a false alarm. Fix the WARN condition appropriately.
Reported-by: Steev Klimaszewski <[email protected]>
Signed-off-by: Kalyan Thota <[email protected]>
---
drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c | 8 +++++---
drivers/gpu/drm/msm/disp/dpu1/dpu_kms.h | 9 +++++++++
drivers/gpu/drm/msm/disp/dpu1/dpu_mdss.c | 11 ++++++-----
3 files changed, 20 insertions(+), 8 deletions(-)
diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c
index cab387f..0071a4d 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c
@@ -294,6 +294,9 @@ static int dpu_kms_parse_data_bus_icc_path(struct dpu_kms *dpu_kms)
struct icc_path *path1;
struct drm_device *dev = dpu_kms->dev;
+ if (!dpu_supports_bw_scaling(dev))
+ return 0;
+
path0 = of_icc_get(dev->dev, "mdp0-mem");
path1 = of_icc_get(dev->dev, "mdp1-mem");
@@ -934,8 +937,7 @@ static int dpu_kms_hw_init(struct msm_kms *kms)
DPU_DEBUG("REG_DMA is not defined");
}
- if (of_device_is_compatible(dev->dev->of_node, "qcom,sc7180-mdss"))
- dpu_kms_parse_data_bus_icc_path(dpu_kms);
+ dpu_kms_parse_data_bus_icc_path(dpu_kms);
pm_runtime_get_sync(&dpu_kms->pdev->dev);
@@ -1198,7 +1200,7 @@ static int __maybe_unused dpu_runtime_resume(struct device *dev)
ddev = dpu_kms->dev;
- WARN_ON(!(dpu_kms->num_paths));
+ WARN_ON((dpu_supports_bw_scaling(ddev) && !dpu_kms->num_paths));
/* Min vote of BW is required before turning on AXI clk */
for (i = 0; i < dpu_kms->num_paths; i++)
icc_set_bw(dpu_kms->path[i], 0, Bps_to_icc(MIN_IB_BW));
diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.h b/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.h
index d6717d6..f7bcc0a 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.h
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.h
@@ -154,6 +154,15 @@ struct vsync_info {
#define to_dpu_global_state(x) container_of(x, struct dpu_global_state, base)
+/**
+ * dpu_supports_bw_scaling: returns true for drivers that support bw scaling.
+ * @dev: Pointer to drm_device structure
+ */
+static inline int dpu_supports_bw_scaling(struct drm_device *dev)
+{
+ return of_device_is_compatible(dev->dev->of_node, "qcom,sc7180-mdss");
+}
+
/* Global private object state for tracking resources that are shared across
* multiple kms objects (planes/crtcs/etc).
*/
diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_mdss.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_mdss.c
index cd40788..8cd712c 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_mdss.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_mdss.c
@@ -41,6 +41,9 @@ static int dpu_mdss_parse_data_bus_icc_path(struct drm_device *dev,
struct icc_path *path0 = of_icc_get(dev->dev, "mdp0-mem");
struct icc_path *path1 = of_icc_get(dev->dev, "mdp1-mem");
+ if (dpu_supports_bw_scaling(dev))
+ return 0;
+
if (IS_ERR_OR_NULL(path0))
return PTR_ERR_OR_ZERO(path0);
@@ -276,11 +279,9 @@ int dpu_mdss_init(struct drm_device *dev)
DRM_DEBUG("mapped mdss address space @%pK\n", dpu_mdss->mmio);
- if (!of_device_is_compatible(dev->dev->of_node, "qcom,sc7180-mdss")) {
- ret = dpu_mdss_parse_data_bus_icc_path(dev, dpu_mdss);
- if (ret)
- return ret;
- }
+ ret = dpu_mdss_parse_data_bus_icc_path(dev, dpu_mdss);
+ if (ret)
+ return ret;
mp = &dpu_mdss->mp;
ret = msm_dss_parse_clock(pdev, mp);
--
2.7.4
Hi,
On Wed, Mar 31, 2021 at 4:27 AM Kalyan Thota <[email protected]> wrote:
>
> @@ -294,6 +294,9 @@ static int dpu_kms_parse_data_bus_icc_path(struct dpu_kms *dpu_kms)
> struct icc_path *path1;
> struct drm_device *dev = dpu_kms->dev;
>
> + if (!dpu_supports_bw_scaling(dev))
> + return 0;
> +
> path0 = of_icc_get(dev->dev, "mdp0-mem");
> path1 = of_icc_get(dev->dev, "mdp1-mem");
>
Instead of hard coding a check for specific SoC compatible strings,
why not just check to see if path0 and/or path1 are ERR_PTR(-ENODEV)?
Then change dpu_supports_bw_scaling() to just return:
!IS_ERR(dpu_kms->path[0])
It also seems like it would be nice if you did something if you got an
error other than -ENODEV. Right now this function returns it but the
caller ignores it? At least spit an error message out?
> @@ -154,6 +154,15 @@ struct vsync_info {
>
> #define to_dpu_global_state(x) container_of(x, struct dpu_global_state, base)
>
> +/**
> + * dpu_supports_bw_scaling: returns true for drivers that support bw scaling.
> + * @dev: Pointer to drm_device structure
> + */
> +static inline int dpu_supports_bw_scaling(struct drm_device *dev)
> +{
> + return of_device_is_compatible(dev->dev->of_node, "qcom,sc7180-mdss");
See above, but I think this would be better as:
return !IS_ERR(dpu_kms->path[0]);
Specifically, I don't think of_device_is_compatible() is really
designed as something to call a lot. It's doing a whole bunch of data
structure parsing / string comparisons. It's OK-ish during probe
(though better to use the of_match_table), but you don't want to call
it on every runtime suspend / runtime resume.
On 31/03/2021 14:27, Kalyan Thota wrote:
> WARN_ON was introduced by the below commit to catch runtime resumes
> that are getting triggered before icc path was set.
>
> "drm/msm/disp/dpu1: icc path needs to be set before dpu runtime resume"
>
> For the targets where the bw scaling is not enabled, this WARN_ON is
> a false alarm. Fix the WARN condition appropriately.
Should we change all DPU targets to use bw scaling to the mdp from the
mdss nodes? The limitation to sc7180 looks artificial.
>
> Reported-by: Steev Klimaszewski <[email protected]>
> Signed-off-by: Kalyan Thota <[email protected]>
> ---
> drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c | 8 +++++---
> drivers/gpu/drm/msm/disp/dpu1/dpu_kms.h | 9 +++++++++
> drivers/gpu/drm/msm/disp/dpu1/dpu_mdss.c | 11 ++++++-----
> 3 files changed, 20 insertions(+), 8 deletions(-)
>
> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c
> index cab387f..0071a4d 100644
> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c
> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c
> @@ -294,6 +294,9 @@ static int dpu_kms_parse_data_bus_icc_path(struct dpu_kms *dpu_kms)
> struct icc_path *path1;
> struct drm_device *dev = dpu_kms->dev;
>
> + if (!dpu_supports_bw_scaling(dev))
> + return 0;
> +
> path0 = of_icc_get(dev->dev, "mdp0-mem");
> path1 = of_icc_get(dev->dev, "mdp1-mem");
>
> @@ -934,8 +937,7 @@ static int dpu_kms_hw_init(struct msm_kms *kms)
> DPU_DEBUG("REG_DMA is not defined");
> }
>
> - if (of_device_is_compatible(dev->dev->of_node, "qcom,sc7180-mdss"))
> - dpu_kms_parse_data_bus_icc_path(dpu_kms);
> + dpu_kms_parse_data_bus_icc_path(dpu_kms);
>
> pm_runtime_get_sync(&dpu_kms->pdev->dev);
>
> @@ -1198,7 +1200,7 @@ static int __maybe_unused dpu_runtime_resume(struct device *dev)
>
> ddev = dpu_kms->dev;
>
> - WARN_ON(!(dpu_kms->num_paths));
> + WARN_ON((dpu_supports_bw_scaling(ddev) && !dpu_kms->num_paths));
> /* Min vote of BW is required before turning on AXI clk */
> for (i = 0; i < dpu_kms->num_paths; i++)
> icc_set_bw(dpu_kms->path[i], 0, Bps_to_icc(MIN_IB_BW));
> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.h b/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.h
> index d6717d6..f7bcc0a 100644
> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.h
> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.h
> @@ -154,6 +154,15 @@ struct vsync_info {
>
> #define to_dpu_global_state(x) container_of(x, struct dpu_global_state, base)
>
> +/**
> + * dpu_supports_bw_scaling: returns true for drivers that support bw scaling.
> + * @dev: Pointer to drm_device structure
> + */
> +static inline int dpu_supports_bw_scaling(struct drm_device *dev)
> +{
> + return of_device_is_compatible(dev->dev->of_node, "qcom,sc7180-mdss");
> +}
> +
> /* Global private object state for tracking resources that are shared across
> * multiple kms objects (planes/crtcs/etc).
> */
> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_mdss.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_mdss.c
> index cd40788..8cd712c 100644
> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_mdss.c
> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_mdss.c
> @@ -41,6 +41,9 @@ static int dpu_mdss_parse_data_bus_icc_path(struct drm_device *dev,
> struct icc_path *path0 = of_icc_get(dev->dev, "mdp0-mem");
> struct icc_path *path1 = of_icc_get(dev->dev, "mdp1-mem");
>
> + if (dpu_supports_bw_scaling(dev))
> + return 0;
> +
> if (IS_ERR_OR_NULL(path0))
> return PTR_ERR_OR_ZERO(path0);
>
> @@ -276,11 +279,9 @@ int dpu_mdss_init(struct drm_device *dev)
>
> DRM_DEBUG("mapped mdss address space @%pK\n", dpu_mdss->mmio);
>
> - if (!of_device_is_compatible(dev->dev->of_node, "qcom,sc7180-mdss")) {
> - ret = dpu_mdss_parse_data_bus_icc_path(dev, dpu_mdss);
> - if (ret)
> - return ret;
> - }
> + ret = dpu_mdss_parse_data_bus_icc_path(dev, dpu_mdss);
> + if (ret)
> + return ret;
>
> mp = &dpu_mdss->mp;
> ret = msm_dss_parse_clock(pdev, mp);
>
--
With best wishes
Dmitry
On Wed, Mar 31, 2021 at 9:03 AM Dmitry Baryshkov
<[email protected]> wrote:
>
> On 31/03/2021 14:27, Kalyan Thota wrote:
> > WARN_ON was introduced by the below commit to catch runtime resumes
> > that are getting triggered before icc path was set.
> >
> > "drm/msm/disp/dpu1: icc path needs to be set before dpu runtime resume"
> >
> > For the targets where the bw scaling is not enabled, this WARN_ON is
> > a false alarm. Fix the WARN condition appropriately.
>
> Should we change all DPU targets to use bw scaling to the mdp from the
> mdss nodes? The limitation to sc7180 looks artificial.
yes, we should, this keeps biting us on 845
> >
> > Reported-by: Steev Klimaszewski <[email protected]>
Please add Fixes: tag as well
> > Signed-off-by: Kalyan Thota <[email protected]>
> > ---
> > drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c | 8 +++++---
> > drivers/gpu/drm/msm/disp/dpu1/dpu_kms.h | 9 +++++++++
> > drivers/gpu/drm/msm/disp/dpu1/dpu_mdss.c | 11 ++++++-----
> > 3 files changed, 20 insertions(+), 8 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c
> > index cab387f..0071a4d 100644
> > --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c
> > +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c
> > @@ -294,6 +294,9 @@ static int dpu_kms_parse_data_bus_icc_path(struct dpu_kms *dpu_kms)
> > struct icc_path *path1;
> > struct drm_device *dev = dpu_kms->dev;
> >
> > + if (!dpu_supports_bw_scaling(dev))
> > + return 0;
> > +
> > path0 = of_icc_get(dev->dev, "mdp0-mem");
> > path1 = of_icc_get(dev->dev, "mdp1-mem");
> >
> > @@ -934,8 +937,7 @@ static int dpu_kms_hw_init(struct msm_kms *kms)
> > DPU_DEBUG("REG_DMA is not defined");
> > }
> >
> > - if (of_device_is_compatible(dev->dev->of_node, "qcom,sc7180-mdss"))
> > - dpu_kms_parse_data_bus_icc_path(dpu_kms);
> > + dpu_kms_parse_data_bus_icc_path(dpu_kms);
> >
> > pm_runtime_get_sync(&dpu_kms->pdev->dev);
> >
> > @@ -1198,7 +1200,7 @@ static int __maybe_unused dpu_runtime_resume(struct device *dev)
> >
> > ddev = dpu_kms->dev;
> >
> > - WARN_ON(!(dpu_kms->num_paths));
> > + WARN_ON((dpu_supports_bw_scaling(ddev) && !dpu_kms->num_paths));
> > /* Min vote of BW is required before turning on AXI clk */
> > for (i = 0; i < dpu_kms->num_paths; i++)
> > icc_set_bw(dpu_kms->path[i], 0, Bps_to_icc(MIN_IB_BW));
> > diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.h b/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.h
> > index d6717d6..f7bcc0a 100644
> > --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.h
> > +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.h
> > @@ -154,6 +154,15 @@ struct vsync_info {
> >
> > #define to_dpu_global_state(x) container_of(x, struct dpu_global_state, base)
> >
> > +/**
> > + * dpu_supports_bw_scaling: returns true for drivers that support bw scaling.
> > + * @dev: Pointer to drm_device structure
> > + */
> > +static inline int dpu_supports_bw_scaling(struct drm_device *dev)
> > +{
> > + return of_device_is_compatible(dev->dev->of_node, "qcom,sc7180-mdss");
> > +}
> > +
> > /* Global private object state for tracking resources that are shared across
> > * multiple kms objects (planes/crtcs/etc).
> > */
> > diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_mdss.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_mdss.c
> > index cd40788..8cd712c 100644
> > --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_mdss.c
> > +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_mdss.c
> > @@ -41,6 +41,9 @@ static int dpu_mdss_parse_data_bus_icc_path(struct drm_device *dev,
> > struct icc_path *path0 = of_icc_get(dev->dev, "mdp0-mem");
> > struct icc_path *path1 = of_icc_get(dev->dev, "mdp1-mem");
> >
> > + if (dpu_supports_bw_scaling(dev))
> > + return 0;
> > +
> > if (IS_ERR_OR_NULL(path0))
> > return PTR_ERR_OR_ZERO(path0);
> >
> > @@ -276,11 +279,9 @@ int dpu_mdss_init(struct drm_device *dev)
> >
> > DRM_DEBUG("mapped mdss address space @%pK\n", dpu_mdss->mmio);
> >
> > - if (!of_device_is_compatible(dev->dev->of_node, "qcom,sc7180-mdss")) {
> > - ret = dpu_mdss_parse_data_bus_icc_path(dev, dpu_mdss);
> > - if (ret)
> > - return ret;
> > - }
> > + ret = dpu_mdss_parse_data_bus_icc_path(dev, dpu_mdss);
> > + if (ret)
> > + return ret;
> >
> > mp = &dpu_mdss->mp;
> > ret = msm_dss_parse_clock(pdev, mp);
> >
>
>
> --
> With best wishes
> Dmitry
On 01/04/2021 01:47, Rob Clark wrote:
> On Wed, Mar 31, 2021 at 9:03 AM Dmitry Baryshkov
> <[email protected]> wrote:
>>
>> On 31/03/2021 14:27, Kalyan Thota wrote:
>>> WARN_ON was introduced by the below commit to catch runtime resumes
>>> that are getting triggered before icc path was set.
>>>
>>> "drm/msm/disp/dpu1: icc path needs to be set before dpu runtime resume"
>>>
>>> For the targets where the bw scaling is not enabled, this WARN_ON is
>>> a false alarm. Fix the WARN condition appropriately.
>>
>> Should we change all DPU targets to use bw scaling to the mdp from the
>> mdss nodes? The limitation to sc7180 looks artificial.
>
> yes, we should, this keeps biting us on 845
Done,
https://lore.kernel.org/linux-arm-msm/[email protected]/
>
>>>
>>> Reported-by: Steev Klimaszewski <[email protected]>
>
> Please add Fixes: tag as well
>
>>> Signed-off-by: Kalyan Thota <[email protected]>
>>> ---
>>> drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c | 8 +++++---
>>> drivers/gpu/drm/msm/disp/dpu1/dpu_kms.h | 9 +++++++++
>>> drivers/gpu/drm/msm/disp/dpu1/dpu_mdss.c | 11 ++++++-----
>>> 3 files changed, 20 insertions(+), 8 deletions(-)
>>>
>>> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c
>>> index cab387f..0071a4d 100644
>>> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c
>>> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c
>>> @@ -294,6 +294,9 @@ static int dpu_kms_parse_data_bus_icc_path(struct dpu_kms *dpu_kms)
>>> struct icc_path *path1;
>>> struct drm_device *dev = dpu_kms->dev;
>>>
>>> + if (!dpu_supports_bw_scaling(dev))
>>> + return 0;
>>> +
>>> path0 = of_icc_get(dev->dev, "mdp0-mem");
>>> path1 = of_icc_get(dev->dev, "mdp1-mem");
>>>
>>> @@ -934,8 +937,7 @@ static int dpu_kms_hw_init(struct msm_kms *kms)
>>> DPU_DEBUG("REG_DMA is not defined");
>>> }
>>>
>>> - if (of_device_is_compatible(dev->dev->of_node, "qcom,sc7180-mdss"))
>>> - dpu_kms_parse_data_bus_icc_path(dpu_kms);
>>> + dpu_kms_parse_data_bus_icc_path(dpu_kms);
>>>
>>> pm_runtime_get_sync(&dpu_kms->pdev->dev);
>>>
>>> @@ -1198,7 +1200,7 @@ static int __maybe_unused dpu_runtime_resume(struct device *dev)
>>>
>>> ddev = dpu_kms->dev;
>>>
>>> - WARN_ON(!(dpu_kms->num_paths));
>>> + WARN_ON((dpu_supports_bw_scaling(ddev) && !dpu_kms->num_paths));
>>> /* Min vote of BW is required before turning on AXI clk */
>>> for (i = 0; i < dpu_kms->num_paths; i++)
>>> icc_set_bw(dpu_kms->path[i], 0, Bps_to_icc(MIN_IB_BW));
>>> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.h b/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.h
>>> index d6717d6..f7bcc0a 100644
>>> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.h
>>> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.h
>>> @@ -154,6 +154,15 @@ struct vsync_info {
>>>
>>> #define to_dpu_global_state(x) container_of(x, struct dpu_global_state, base)
>>>
>>> +/**
>>> + * dpu_supports_bw_scaling: returns true for drivers that support bw scaling.
>>> + * @dev: Pointer to drm_device structure
>>> + */
>>> +static inline int dpu_supports_bw_scaling(struct drm_device *dev)
>>> +{
>>> + return of_device_is_compatible(dev->dev->of_node, "qcom,sc7180-mdss");
>>> +}
>>> +
>>> /* Global private object state for tracking resources that are shared across
>>> * multiple kms objects (planes/crtcs/etc).
>>> */
>>> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_mdss.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_mdss.c
>>> index cd40788..8cd712c 100644
>>> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_mdss.c
>>> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_mdss.c
>>> @@ -41,6 +41,9 @@ static int dpu_mdss_parse_data_bus_icc_path(struct drm_device *dev,
>>> struct icc_path *path0 = of_icc_get(dev->dev, "mdp0-mem");
>>> struct icc_path *path1 = of_icc_get(dev->dev, "mdp1-mem");
>>>
>>> + if (dpu_supports_bw_scaling(dev))
>>> + return 0;
>>> +
>>> if (IS_ERR_OR_NULL(path0))
>>> return PTR_ERR_OR_ZERO(path0);
>>>
>>> @@ -276,11 +279,9 @@ int dpu_mdss_init(struct drm_device *dev)
>>>
>>> DRM_DEBUG("mapped mdss address space @%pK\n", dpu_mdss->mmio);
>>>
>>> - if (!of_device_is_compatible(dev->dev->of_node, "qcom,sc7180-mdss")) {
>>> - ret = dpu_mdss_parse_data_bus_icc_path(dev, dpu_mdss);
>>> - if (ret)
>>> - return ret;
>>> - }
>>> + ret = dpu_mdss_parse_data_bus_icc_path(dev, dpu_mdss);
>>> + if (ret)
>>> + return ret;
>>>
>>> mp = &dpu_mdss->mp;
>>> ret = msm_dss_parse_clock(pdev, mp);
>>>
>>
>>
>> --
>> With best wishes
>> Dmitry
--
With best wishes
Dmitry
On 2021-04-01 07:37, Dmitry Baryshkov wrote:
> On 01/04/2021 01:47, Rob Clark wrote:
>> On Wed, Mar 31, 2021 at 9:03 AM Dmitry Baryshkov
>> <[email protected]> wrote:
>>>
>>> On 31/03/2021 14:27, Kalyan Thota wrote:
>>>> WARN_ON was introduced by the below commit to catch runtime resumes
>>>> that are getting triggered before icc path was set.
>>>>
>>>> "drm/msm/disp/dpu1: icc path needs to be set before dpu runtime
>>>> resume"
>>>>
>>>> For the targets where the bw scaling is not enabled, this WARN_ON is
>>>> a false alarm. Fix the WARN condition appropriately.
>>>
>>> Should we change all DPU targets to use bw scaling to the mdp from
>>> the
>>> mdss nodes? The limitation to sc7180 looks artificial.
>>
>> yes, we should, this keeps biting us on 845
>
> Done,
> https://lore.kernel.org/linux-arm-msm/[email protected]/
Hi Dmitry,
https://lore.kernel.org/linux-arm-msm/[email protected]/
you need to add clk_inefficiency_factor, bw_inefficiency_factor in the
catalogue for the new
targets where bw scaling is being enabled. please reuse sc7180 values.
secondly, the AXI clock needs to be moved from mdss to mdp device like
as in sc7180 dt if its not done already.
lastly, if you are planning to remove the static votes from dpu_mdss, do
you also want to move the
interconnect paths from mdss device to mdp device in the dt ?
Thanks,
Kalyan
>
>>
>>>>
>>>> Reported-by: Steev Klimaszewski <[email protected]>
>>
>> Please add Fixes: tag as well
Adding Fixes tag above my sign-off, should i push another version or can
it be picked from here ?
Fixes: Id252b9c2887 ("drm/msm/disp/dpu1: icc path needs to be set before
dpu runtime resume")
>>
>>>> Signed-off-by: Kalyan Thota <[email protected]>
>>>> ---
>>>> drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c | 8 +++++---
>>>> drivers/gpu/drm/msm/disp/dpu1/dpu_kms.h | 9 +++++++++
>>>> drivers/gpu/drm/msm/disp/dpu1/dpu_mdss.c | 11 ++++++-----
>>>> 3 files changed, 20 insertions(+), 8 deletions(-)
>>>>
>>>> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c
>>>> b/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c
>>>> index cab387f..0071a4d 100644
>>>> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c
>>>> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c
>>>> @@ -294,6 +294,9 @@ static int
>>>> dpu_kms_parse_data_bus_icc_path(struct dpu_kms *dpu_kms)
>>>> struct icc_path *path1;
>>>> struct drm_device *dev = dpu_kms->dev;
>>>>
>>>> + if (!dpu_supports_bw_scaling(dev))
>>>> + return 0;
>>>> +
>>>> path0 = of_icc_get(dev->dev, "mdp0-mem");
>>>> path1 = of_icc_get(dev->dev, "mdp1-mem");
>>>>
>>>> @@ -934,8 +937,7 @@ static int dpu_kms_hw_init(struct msm_kms *kms)
>>>> DPU_DEBUG("REG_DMA is not defined");
>>>> }
>>>>
>>>> - if (of_device_is_compatible(dev->dev->of_node,
>>>> "qcom,sc7180-mdss"))
>>>> - dpu_kms_parse_data_bus_icc_path(dpu_kms);
>>>> + dpu_kms_parse_data_bus_icc_path(dpu_kms);
>>>>
>>>> pm_runtime_get_sync(&dpu_kms->pdev->dev);
>>>>
>>>> @@ -1198,7 +1200,7 @@ static int __maybe_unused
>>>> dpu_runtime_resume(struct device *dev)
>>>>
>>>> ddev = dpu_kms->dev;
>>>>
>>>> - WARN_ON(!(dpu_kms->num_paths));
>>>> + WARN_ON((dpu_supports_bw_scaling(ddev) &&
>>>> !dpu_kms->num_paths));
>>>> /* Min vote of BW is required before turning on AXI clk */
>>>> for (i = 0; i < dpu_kms->num_paths; i++)
>>>> icc_set_bw(dpu_kms->path[i], 0,
>>>> Bps_to_icc(MIN_IB_BW));
>>>> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.h
>>>> b/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.h
>>>> index d6717d6..f7bcc0a 100644
>>>> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.h
>>>> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.h
>>>> @@ -154,6 +154,15 @@ struct vsync_info {
>>>>
>>>> #define to_dpu_global_state(x) container_of(x, struct
>>>> dpu_global_state, base)
>>>>
>>>> +/**
>>>> + * dpu_supports_bw_scaling: returns true for drivers that support
>>>> bw scaling.
>>>> + * @dev: Pointer to drm_device structure
>>>> + */
>>>> +static inline int dpu_supports_bw_scaling(struct drm_device *dev)
>>>> +{
>>>> + return of_device_is_compatible(dev->dev->of_node,
>>>> "qcom,sc7180-mdss");
>>>> +}
>>>> +
>>>> /* Global private object state for tracking resources that are
>>>> shared across
>>>> * multiple kms objects (planes/crtcs/etc).
>>>> */
>>>> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_mdss.c
>>>> b/drivers/gpu/drm/msm/disp/dpu1/dpu_mdss.c
>>>> index cd40788..8cd712c 100644
>>>> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_mdss.c
>>>> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_mdss.c
>>>> @@ -41,6 +41,9 @@ static int dpu_mdss_parse_data_bus_icc_path(struct
>>>> drm_device *dev,
>>>> struct icc_path *path0 = of_icc_get(dev->dev, "mdp0-mem");
>>>> struct icc_path *path1 = of_icc_get(dev->dev, "mdp1-mem");
>>>>
>>>> + if (dpu_supports_bw_scaling(dev))
>>>> + return 0;
>>>> +
>>>> if (IS_ERR_OR_NULL(path0))
>>>> return PTR_ERR_OR_ZERO(path0);
>>>>
>>>> @@ -276,11 +279,9 @@ int dpu_mdss_init(struct drm_device *dev)
>>>>
>>>> DRM_DEBUG("mapped mdss address space @%pK\n",
>>>> dpu_mdss->mmio);
>>>>
>>>> - if (!of_device_is_compatible(dev->dev->of_node,
>>>> "qcom,sc7180-mdss")) {
>>>> - ret = dpu_mdss_parse_data_bus_icc_path(dev, dpu_mdss);
>>>> - if (ret)
>>>> - return ret;
>>>> - }
>>>> + ret = dpu_mdss_parse_data_bus_icc_path(dev, dpu_mdss);
>>>> + if (ret)
>>>> + return ret;
>>>>
>>>> mp = &dpu_mdss->mp;
>>>> ret = msm_dss_parse_clock(pdev, mp);
>>>>
>>>
>>>
>>> --
>>> With best wishes
>>> Dmitry