[Freedreno] [PATCH v3] drm/msm/mdp5: stop overriding drvdata

[Abhinav Kumar]

On 10/24/2022 8:26 AM, Dmitry Baryshkov wrote:
> The rest of the code expects that master's device drvdata is the
> struct msm_drm_private instance. Do not override the mdp5's drvdata.
> 
> Fixes: 6874f48bb8b0 ("drm/msm: make mdp5/dpu devices master components")
> Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov at linaro.org>
> ---
> Abhinav, Rob, please pick this for -fixes.
> 
> This is an updated version of [1]. Fixed the read_mdp_hw_revision()
> function. PM runtime isn't available at the moment, as priv->kms is not
> set.
> 
> [1] https://patchwork.freedesktop.org/patch/490326/?series=105392&rev=1
> 
> Changes since v2:
> - Removed the clause checking whether mdp5_enable() has failed (it can
>    not fail, noted by Abhinav)
> 
> Changes since v1:
> - Expanded the patch to also handle the read_mdp_hw_revision() and also
>    to move pm enablement to the place where the pm_runtime can actually
>    be used.
> 
> ---
>   drivers/gpu/drm/msm/disp/mdp5/mdp5_kms.c | 32 +++++++++++++-----------
>   1 file changed, 17 insertions(+), 15 deletions(-)
> 
> diff --git a/drivers/gpu/drm/msm/disp/mdp5/mdp5_kms.c b/drivers/gpu/drm/msm/disp/mdp5/mdp5_kms.c
> index b0d21838a134..b46f983f2b46 100644
> --- a/drivers/gpu/drm/msm/disp/mdp5/mdp5_kms.c
> +++ b/drivers/gpu/drm/msm/disp/mdp5/mdp5_kms.c
> @@ -203,7 +203,7 @@ static int mdp5_set_split_display(struct msm_kms *kms,
>   							  slave_encoder);
>   }
>   
> -static void mdp5_destroy(struct platform_device *pdev);
> +static void mdp5_destroy(struct mdp5_kms *mdp5_kms);
>   
>   static void mdp5_kms_destroy(struct msm_kms *kms)
>   {
> @@ -223,7 +223,7 @@ static void mdp5_kms_destroy(struct msm_kms *kms)
>   	}
>   
>   	mdp_kms_destroy(&mdp5_kms->base);
> -	mdp5_destroy(mdp5_kms->pdev);
> +	mdp5_destroy(mdp5_kms);
>   }
>   
>   #ifdef CONFIG_DEBUG_FS
> @@ -519,9 +519,10 @@ static void read_mdp_hw_revision(struct mdp5_kms *mdp5_kms,
>   	struct device *dev = &mdp5_kms->pdev->dev;
>   	u32 version;
>   
> -	pm_runtime_get_sync(dev);
> +	/* Manually enable the MDP5, as pm runtime isn't usable yet. */
> +	mdp5_enable(mdp5_kms);
>   	version = mdp5_read(mdp5_kms, REG_MDP5_HW_VERSION);
> -	pm_runtime_put_sync(dev);
> +	mdp5_disable(mdp5_kms);

Please correct me if wrong here, if we bypass the pm to enable the 
clocks explicitly here, are we still guaranteed about GDSC to be ON?


>   
>   	*major = FIELD(version, MDP5_HW_VERSION_MAJOR);
>   	*minor = FIELD(version, MDP5_HW_VERSION_MINOR);
> @@ -559,6 +560,8 @@ static int mdp5_kms_init(struct drm_device *dev)
>   	int irq, i, ret;
>   
>   	ret = mdp5_init(to_platform_device(dev->dev), dev);
> +	if (ret)
> +		return ret;
>   
>   	/* priv->kms would have been populated by the MDP5 driver */
>   	kms = priv->kms;
> @@ -632,9 +635,8 @@ static int mdp5_kms_init(struct drm_device *dev)
>   	return ret;
>   }
>   
> -static void mdp5_destroy(struct platform_device *pdev)
> +static void mdp5_destroy(struct mdp5_kms *mdp5_kms)
>   {
> -	struct mdp5_kms *mdp5_kms = platform_get_drvdata(pdev);
>   	int i;
>   
>   	if (mdp5_kms->ctlm)
> @@ -648,7 +650,7 @@ static void mdp5_destroy(struct platform_device *pdev)
>   		kfree(mdp5_kms->intfs[i]);
>   
>   	if (mdp5_kms->rpm_enabled)
> -		pm_runtime_disable(&pdev->dev);
> +		pm_runtime_disable(&mdp5_kms->pdev->dev);
>   
>   	drm_atomic_private_obj_fini(&mdp5_kms->glob_state);
>   	drm_modeset_lock_fini(&mdp5_kms->glob_state_lock);
> @@ -797,8 +799,6 @@ static int mdp5_init(struct platform_device *pdev, struct drm_device *dev)
>   		goto fail;
>   	}
>   
> -	platform_set_drvdata(pdev, mdp5_kms);
> -
>   	spin_lock_init(&mdp5_kms->resource_lock);
>   
>   	mdp5_kms->dev = dev;
> @@ -839,9 +839,6 @@ static int mdp5_init(struct platform_device *pdev, struct drm_device *dev)
>   	 */
>   	clk_set_rate(mdp5_kms->core_clk, 200000000);
>   
> -	pm_runtime_enable(&pdev->dev);
> -	mdp5_kms->rpm_enabled = true;
> -
>   	read_mdp_hw_revision(mdp5_kms, &major, &minor);
>   
>   	mdp5_kms->cfg = mdp5_cfg_init(mdp5_kms, major, minor);
> @@ -893,10 +890,13 @@ static int mdp5_init(struct platform_device *pdev, struct drm_device *dev)
>   	/* set uninit-ed kms */
>   	priv->kms = &mdp5_kms->base.base;
>   
> +	pm_runtime_enable(&pdev->dev);
> +	mdp5_kms->rpm_enabled = true;
> +
>   	return 0;
>   fail:
>   	if (mdp5_kms)
> -		mdp5_destroy(pdev);
> +		mdp5_destroy(mdp5_kms);
>   	return ret;
>   }
>   
> @@ -953,7 +953,8 @@ static int mdp5_dev_remove(struct platform_device *pdev)
>   static __maybe_unused int mdp5_runtime_suspend(struct device *dev)
>   {
>   	struct platform_device *pdev = to_platform_device(dev);
> -	struct mdp5_kms *mdp5_kms = platform_get_drvdata(pdev);
> +	struct msm_drm_private *priv = platform_get_drvdata(pdev);
> +	struct mdp5_kms *mdp5_kms = to_mdp5_kms(to_mdp_kms(priv->kms));
>   
>   	DBG("");
>   
> @@ -963,7 +964,8 @@ static __maybe_unused int mdp5_runtime_suspend(struct device *dev)
>   static __maybe_unused int mdp5_runtime_resume(struct device *dev)
>   {
>   	struct platform_device *pdev = to_platform_device(dev);
> -	struct mdp5_kms *mdp5_kms = platform_get_drvdata(pdev);
> +	struct msm_drm_private *priv = platform_get_drvdata(pdev);
> +	struct mdp5_kms *mdp5_kms = to_mdp5_kms(to_mdp_kms(priv->kms));
>   
>   	DBG("");
>