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

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Message-ID: <370802ea-5f21-7a62-cf84-0dc5f5020667@arm.com>
Date:   Thu, 17 Sep 2020 11:29:05 +0100
From:   Steven Price <steven.price@....com>
To:     Neil Armstrong <narmstrong@...libre.com>, robh@...nel.org,
        tomeu.vizoso@...labora.com, alyssa.rosenzweig@...labora.com
Cc:     dri-devel@...ts.freedesktop.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-amlogic@...ts.infradead.org
Subject: Re: [PATCH v2 1/3] drm/panfrost: add support for vendor quirk

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@...libre.com>

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