Re: [PATCH v2 1/3] drm/panfrost: add support for vendor quirk

Steven Price
2020-09-17T10:30:38Z

On 16/09/2020 16:01, Neil Armstrong wrote:
> The T820, G31 & G52 GPUs integratewd by Amlogic in the respective GXM, G12A/SM1 & G12B

NIT: s/integratewd/integrated/

> SoCs needs a quirk in the PWR registers after each reset.
>
> This adds a callback in the device compatible struct of permit this.
>
> Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>

Reviewed-by: Steven Price <steven.price@arm.com>

> ---
> drivers/gpu/drm/panfrost/panfrost_device.h | 3 +++
> drivers/gpu/drm/panfrost/panfrost_gpu.c | 4 ++++
> 2 files changed, 7 insertions(+)
>
> diff --git a/drivers/gpu/drm/panfrost/panfrost_device.h b/drivers/gpu/drm/panfrost/panfrost_device.h
> index abfc78db193a..140e004a3790 100644
> --- a/drivers/gpu/drm/panfrost/panfrost_device.h
> +++ b/drivers/gpu/drm/panfrost/panfrost_device.h
> @@ -70,6 +70,9 @@ struct panfrost_compatible {
> int num_pm_domains;
> /* Only required if num_pm_domains > 1. */
> const char * const *pm_domain_names;
> +
> + /* Vendor implementation quirks callback */
> + void (*vendor_quirk)(struct panfrost_device *pfdev);
> };
>
> struct panfrost_device {
> diff --git a/drivers/gpu/drm/panfrost/panfrost_gpu.c b/drivers/gpu/drm/panfrost/panfrost_gpu.c
> index c7c5da5a31d4..a6de78bc1fa8 100644
> --- a/drivers/gpu/drm/panfrost/panfrost_gpu.c
> +++ b/drivers/gpu/drm/panfrost/panfrost_gpu.c
> @@ -136,6 +136,10 @@ static void panfrost_gpu_init_quirks(struct panfrost_device *pfdev)
>
> if (quirks)
> gpu_write(pfdev, GPU_JM_CONFIG, quirks);
> +
> + /* Here goes platform specific quirks */
> + if (pfdev->comp->vendor_quirk)
> + pfdev->comp->vendor_quirk(pfdev);
> }
>
> #define MAX_HW_REVS 6