linux-kernel - Re: [PATCH v10 12/16] drm/mediatek: gamma: Make sure relay mode is disabled

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Date:   Thu, 12 Oct 2023 02:29:09 +0000
From:   CK Hu (胡俊光) <ck.hu@...iatek.com>
To:     "angelogioacchino.delregno@...labora.com" 
        <angelogioacchino.delregno@...labora.com>,
        "chunkuang.hu@...nel.org" <chunkuang.hu@...nel.org>
CC:     "linux-mediatek@...ts.infradead.org" 
        <linux-mediatek@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "wenst@...omium.org" <wenst@...omium.org>,
        Jason-JH Lin (林睿祥) 
        <Jason-JH.Lin@...iatek.com>,
        "kernel@...labora.com" <kernel@...labora.com>,
        "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
        "amergnat@...libre.com" <amergnat@...libre.com>,
        "ehristev@...labora.com" <ehristev@...labora.com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "matthias.bgg@...il.com" <matthias.bgg@...il.com>
Subject: Re: [PATCH v10 12/16] drm/mediatek: gamma: Make sure relay mode is
 disabled

Hi, Angelo:

On Fri, 2023-08-04 at 09:28 +0200, AngeloGioacchino Del Regno wrote:
> Disable relay mode at the end of LUT programming to make sure that
> the
> processed image goes through in both DISP_GAMMA and DISP_AAL for
> gamma
> setting.
> 
> Signed-off-by: AngeloGioacchino Del Regno <
> angelogioacchino.delregno@...labora.com>
> Reviewed-by: Jason-JH.Lin <jason-jh.lin@...iatek.com>
> Reviewed-by: Alexandre Mergnat <amergnat@...libre.com>
> ---
>  drivers/gpu/drm/mediatek/mtk_disp_aal.c   | 3 +++
>  drivers/gpu/drm/mediatek/mtk_disp_gamma.c | 4 ++++
>  2 files changed, 7 insertions(+)
> 
> diff --git a/drivers/gpu/drm/mediatek/mtk_disp_aal.c
> b/drivers/gpu/drm/mediatek/mtk_disp_aal.c
> index 21b25470e9b7..992dc1424c91 100644
> --- a/drivers/gpu/drm/mediatek/mtk_disp_aal.c
> +++ b/drivers/gpu/drm/mediatek/mtk_disp_aal.c
> @@ -122,6 +122,9 @@ void mtk_aal_gamma_set(struct device *dev, struct
> drm_crtc_state *state)
>  		writel(word, (aal->regs + DISP_AAL_GAMMA_LUT) + (i *
> 4));
>  	}
>  
> +	/* Disable RELAY mode to pass the processed image */
> +	cfg_val &= ~AAL_RELAY_MODE;

It seems that the relay mode is default turned off. But explicitly
setting it is good to me. After adding AAL_RELAY_MODE definition in
this patch,

Reviewed-by: CK Hu <ck.hu@...iatek.com>

> +
>  	writel(cfg_val, aal->regs + DISP_AAL_CFG);
>  }
>  
> diff --git a/drivers/gpu/drm/mediatek/mtk_disp_gamma.c
> b/drivers/gpu/drm/mediatek/mtk_disp_gamma.c
> index 7d2f8042ace0..fbff9f97b737 100644
> --- a/drivers/gpu/drm/mediatek/mtk_disp_gamma.c
> +++ b/drivers/gpu/drm/mediatek/mtk_disp_gamma.c
> @@ -19,6 +19,7 @@
>  #define DISP_GAMMA_EN				0x0000
>  #define GAMMA_EN					BIT(0)
>  #define DISP_GAMMA_CFG				0x0020
> +#define GAMMA_RELAY_MODE				BIT(0)
>  #define GAMMA_LUT_EN					BIT(1)
>  #define GAMMA_DITHERING					BIT(2)
>  #define DISP_GAMMA_SIZE				0x0030
> @@ -177,6 +178,9 @@ void mtk_gamma_set(struct device *dev, struct
> drm_crtc_state *state)
>  	/* Enable the gamma table */
>  	cfg_val |= FIELD_PREP(GAMMA_LUT_EN, 1);
>  
> +	/* Disable RELAY mode to pass the processed image */
> +	cfg_val &= ~GAMMA_RELAY_MODE;
> +
>  	writel(cfg_val, gamma->regs + DISP_GAMMA_CFG);
>  }
>