linux-kernel - Re: [PATCH] soc: mediatek: mmsys: fix HDMI output on mt7623/bananapi-r2

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Date:   Mon, 12 Jul 2021 13:50:08 +0200
From:   Dafna Hirschfeld <dafna.hirschfeld@...labora.com>
To:     Frank Wunderlich <linux@...web.de>,
        linux-mediatek@...ts.infradead.org
Cc:     Frank Wunderlich <frank-w@...lic-files.de>,
        Matthias Brugger <matthias.bgg@...il.com>,
        CK Hu <ck.hu@...iatek.com>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Enric Balletbo Serra <eballetbo@...il.com>,
        David Airlie <airlied@...ux.ie>,
        dri-devel@...ts.freedesktop.org, Daniel Vetter <daniel@...ll.ch>
Subject: Re: [PATCH] soc: mediatek: mmsys: fix HDMI output on
 mt7623/bananapi-r2

Hi

On 10.07.21 15:24, Frank Wunderlich wrote:
> From: Frank Wunderlich <frank-w@...lic-files.de>
> 
> HDMI output was broken on mt7623/BPI-R2 in 5.13 because function for
> special output selection (mtk_mmsys_ddp_sout_sel) was dropped.
> This function wrote 3 registers at one time and so it is not compatible
> with the array-approach.
> 
> I re-added the old function and call this after the default routing table
> was applied. This default routing table can still be used as the only
> connection handled by mmsys on BPI-R2 is OVL0->RDMA0 and this is already
> present in the default routing table
> 
> Fixes: 440147639ac7 ("soc: mediatek: mmsys: Use an array for setting the routing registers")
> Signed-off-by: Frank Wunderlich <frank-w@...lic-files.de>
> ---
>   drivers/soc/mediatek/mtk-mmsys.c | 21 +++++++++++++++++++++
>   1 file changed, 21 insertions(+)
> 
> diff --git a/drivers/soc/mediatek/mtk-mmsys.c b/drivers/soc/mediatek/mtk-mmsys.c
> index 080660ef11bf..f91b7fdd417a 100644
> --- a/drivers/soc/mediatek/mtk-mmsys.c
> +++ b/drivers/soc/mediatek/mtk-mmsys.c
> @@ -57,6 +57,25 @@ struct mtk_mmsys {
>   	const struct mtk_mmsys_driver_data *data;
>   };
>   
> +static void mtk_mmsys_ddp_sout_sel(struct device *dev,
> +				   enum mtk_ddp_comp_id cur,
> +				   enum mtk_ddp_comp_id next)
> +{
> +	struct mtk_mmsys *mmsys = dev_get_drvdata(dev);
> +
> +	if (cur == DDP_COMPONENT_BLS && next == DDP_COMPONENT_DSI0) {
> +		writel_relaxed(BLS_TO_DSI_RDMA1_TO_DPI1,
> +			       mmsys->regs + DISP_REG_CONFIG_OUT_SEL);
> +	} else if (cur == DDP_COMPONENT_BLS && next == DDP_COMPONENT_DPI0) {
> +		writel_relaxed(BLS_TO_DPI_RDMA1_TO_DSI,
> +			       mmsys->regs + DISP_REG_CONFIG_OUT_SEL);
> +		writel_relaxed(DSI_SEL_IN_RDMA,
> +			       mmsys->regs + DISP_REG_CONFIG_DSI_SEL);
> +		writel_relaxed(DPI_SEL_IN_BLS,
> +			       mmsys->regs + DISP_REG_CONFIG_DPI_SEL);

you can still use the array approach for this like that:

         {
                 DDP_COMPONENT_BLS, DDP_COMPONENT_DSI0,
                 DISP_REG_CONFIG_OUT_SEL, BLS_TO_DSI_RDMA1_TO_DPI1
         }, {
         {
                 DDP_COMPONENT_BLS, DDP_COMPONENT_DPI0,
                 DISP_REG_CONFIG_OUT_SEL, BLS_TO_DPI_RDMA1_TO_DSI
         }, {
         {
                 DDP_COMPONENT_BLS, DDP_COMPONENT_DPI0,
                 DISP_REG_CONFIG_DSI_SEL, DSI_SEL_IN_RDMA
         }, {
         {
                 DDP_COMPONENT_BLS, DDP_COMPONENT_DPI0,
                 DISP_REG_CONFIG_DPI_SEL, DPI_SEL_IN_BLS
         }, {


Thanks,
Dafna

> +	}
> +}
> +
>   void mtk_mmsys_ddp_connect(struct device *dev,
>   			   enum mtk_ddp_comp_id cur,
>   			   enum mtk_ddp_comp_id next)
> @@ -71,6 +90,8 @@ void mtk_mmsys_ddp_connect(struct device *dev,
>   			reg = readl_relaxed(mmsys->regs + routes[i].addr) | routes[i].val;
>   			writel_relaxed(reg, mmsys->regs + routes[i].addr);
>   		}
> +
> +	mtk_mmsys_ddp_sout_sel(dev, cur, next);
>   }
>   EXPORT_SYMBOL_GPL(mtk_mmsys_ddp_connect);
>   
>