linux-kernel - Re: [PATCH 6/7] drm/msm/a5xx: Disable flat shading optimization

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Message-ID: <CAF6AEGtZhnWqzP4YAh-zBX_kYXZWWx6a_deV8ONHfQ4af394ew@mail.gmail.com>
Date:   Sun, 27 Sep 2020 11:56:03 -0700
From:   Rob Clark <robdclark@...il.com>
To:     AngeloGioacchino Del Regno <kholk11@...il.com>
Cc:     Sean Paul <sean@...rly.run>, David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Jordan Crouse <jcrouse@...eaurora.org>,
        Konrad Dybcio <konradybcio@...il.com>, marijns95@...il.com,
        martin.botka1@...il.com,
        linux-arm-msm <linux-arm-msm@...r.kernel.org>,
        freedreno <freedreno@...ts.freedesktop.org>,
        phone-devel@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 6/7] drm/msm/a5xx: Disable flat shading optimization

On Sat, Sep 26, 2020 at 5:52 AM <kholk11@...il.com> wrote:
>
> From: Konrad Dybcio <konradybcio@...il.com>
>
> Port over the command from downstream to prevent undefined
> behaviour.
>
> Signed-off-by: Konrad Dybcio <konradybcio@...il.com>
> Signed-off-by: AngeloGioacchino Del Regno <kholk11@...il.com>
> ---
>  drivers/gpu/drm/msm/adreno/a5xx_gpu.c | 3 +++
>  1 file changed, 3 insertions(+)
>
> diff --git a/drivers/gpu/drm/msm/adreno/a5xx_gpu.c b/drivers/gpu/drm/msm/adreno/a5xx_gpu.c
> index b2670af638a3..bdc852e7d979 100644
> --- a/drivers/gpu/drm/msm/adreno/a5xx_gpu.c
> +++ b/drivers/gpu/drm/msm/adreno/a5xx_gpu.c
> @@ -759,6 +759,9 @@ static int a5xx_hw_init(struct msm_gpu *gpu)
>             adreno_is_a540(adreno_gpu))
>                 gpu_write(gpu, REG_A5XX_UCHE_DBG_ECO_CNTL_2, bit);
>
> +       /* Disable All flat shading optimization */
> +       gpu_rmw(gpu, 0x00000E60, 0, 0x1 << 10);

Looks like VPC_DBG_ECO_CNTL.ALLFLATOPTDIS (based on downstream
41582a1f24d2961094c556db788028b433d8476a)

BR,
-R

> +
>         /* Protect registers from the CP */
>         gpu_write(gpu, REG_A5XX_CP_PROTECT_CNTL, 0x00000007);
>
> --
> 2.28.0
>