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Message-ID: <c8d6769b-eb28-337c-fa55-4dae86611da5@quicinc.com>
Date: Fri, 5 Jan 2024 16:04:30 -0800
From: Carl Vanderlip <quic_carlv@...cinc.com>
To: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
Rob Clark
<robdclark@...il.com>,
Abhinav Kumar <quic_abhinavk@...cinc.com>,
Sean Paul
<sean@...rly.run>,
Marijn Suijten <marijn.suijten@...ainline.org>,
"David
Airlie" <airlied@...il.com>, Daniel Vetter <daniel@...ll.ch>
CC: <linux-arm-msm@...r.kernel.org>, <freedreno@...ts.freedesktop.org>,
<linux-kernel@...r.kernel.org>, <dri-devel@...ts.freedesktop.org>,
"Stephen
Boyd" <swboyd@...omium.org>
Subject: Re: [PATCH v3 3/4] drm/msm: add a kernel param to select between MDP5
and DPU drivers
On 1/5/2024 3:34 PM, Dmitry Baryshkov wrote:
> For some of the platforms (e.g. SDM660, SDM630, MSM8996, etc.) it is
> possible to support this platform via the DPU driver (e.g. to provide
> support for DP, multirect, etc). Add a modparam to be able to switch
> between these two drivers.
>
> All platforms supported by both drivers are by default handled by the
> MDP5 driver. To let them be handled by the DPU driver pass the
> `msm.prefer_mdp5=false` kernel param.
>
> Reviewed-by: Stephen Boyd <swboyd@...omium.org>
> Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
> ---
> drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c | 3 +++
> drivers/gpu/drm/msm/disp/mdp5/mdp5_kms.c | 3 +++
> drivers/gpu/drm/msm/msm_drv.c | 31 +++++++++++++++++++++++++++++++
> drivers/gpu/drm/msm/msm_drv.h | 1 +
> 4 files changed, 38 insertions(+)
>
> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c
> index aa9e0ad33ebb..8f11a98491a1 100644
> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c
> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c
> @@ -1276,6 +1276,9 @@ static int dpu_dev_probe(struct platform_device *pdev)
> int irq;
> int ret = 0;
>
> + if (!msm_disp_drv_should_bind(&pdev->dev, true))
> + return -ENODEV;
> +
> dpu_kms = devm_kzalloc(dev, sizeof(*dpu_kms), GFP_KERNEL);
> if (!dpu_kms)
> return -ENOMEM;
> diff --git a/drivers/gpu/drm/msm/disp/mdp5/mdp5_kms.c b/drivers/gpu/drm/msm/disp/mdp5/mdp5_kms.c
> index 0827634664ae..43d05851c54d 100644
> --- a/drivers/gpu/drm/msm/disp/mdp5/mdp5_kms.c
> +++ b/drivers/gpu/drm/msm/disp/mdp5/mdp5_kms.c
> @@ -866,6 +866,9 @@ static int mdp5_dev_probe(struct platform_device *pdev)
>
> DBG("");
>
> + if (!msm_disp_drv_should_bind(&pdev->dev, false))
> + return -ENODEV;
> +
> mdp5_kms = devm_kzalloc(&pdev->dev, sizeof(*mdp5_kms), GFP_KERNEL);
> if (!mdp5_kms)
> return -ENOMEM;
> diff --git a/drivers/gpu/drm/msm/msm_drv.c b/drivers/gpu/drm/msm/msm_drv.c
> index 50b65ffc24b1..ef57586fbeca 100644
> --- a/drivers/gpu/drm/msm/msm_drv.c
> +++ b/drivers/gpu/drm/msm/msm_drv.c
> @@ -969,6 +969,37 @@ static int add_components_mdp(struct device *master_dev,
> return 0;
> }
>
> +#if !IS_REACHABLE(CONFIG_DRM_MSM_MDP5) || !IS_REACHABLE(CONFIG_DRM_MSM_DPU)
> +bool msm_disp_drv_should_bind(struct device *dev, bool mdp5_driver)
s/mdp5_driver/dpu_driver/
> +{
> + /* If just a single driver is enabled, use it no matter what */
> + return true;
> +}
This will cause both MDP/DPU probes to return -ENODEV, rather than
select the enabled one.
> +#else
> +
> +static bool prefer_mdp5 = true;
> +MODULE_PARM_DESC(prefer_mdp5, "Select whether MDP5 or DPU driver should be preferred");
> +module_param(prefer_mdp5, bool, 0444);
> +
> +/* list all platforms supported by both mdp5 and dpu drivers */
> +static const char *const msm_mdp5_dpu_migration[] = {
> + NULL,
> +};
> +
> +bool msm_disp_drv_should_bind(struct device *dev, bool dpu_driver)
> +{
> + /* If it is not an MDP5 device, do not try MDP5 driver */
> + if (!of_device_is_compatible(dev->of_node, "qcom,mdp5"))
> + return dpu_driver;
> +
> + /* If it is not in the migration list, use MDP5 */
> + if (!of_device_compatible_match(dev->of_node, msm_mdp5_dpu_migration))
> + return !dpu_driver;
> +
> + return prefer_mdp5 ? !dpu_driver : dpu_driver;
> +}
> +#endif
> +
> /*
> * We don't know what's the best binding to link the gpu with the drm device.
> * Fow now, we just hunt for all the possible gpus that we support, and add them
> diff --git a/drivers/gpu/drm/msm/msm_drv.h b/drivers/gpu/drm/msm/msm_drv.h
> index 01e783130054..762e13e2df74 100644
> --- a/drivers/gpu/drm/msm/msm_drv.h
> +++ b/drivers/gpu/drm/msm/msm_drv.h
> @@ -563,5 +563,6 @@ int msm_drv_probe(struct device *dev,
> struct msm_kms *kms);
> void msm_kms_shutdown(struct platform_device *pdev);
>
> +bool msm_disp_drv_should_bind(struct device *dev, bool dpu_driver);
>
> #endif /* __MSM_DRV_H__ */
>
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