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    Subject[PATCH 5.17 247/772] drm/mediatek: Fix mtk_cec_mask()
    Date
    From: Miles Chen <miles.chen@mediatek.com>

    [ Upstream commit 2c5d69b0a141e1e98febe3111e6f4fd8420493a5 ]

    In current implementation, mtk_cec_mask() writes val into target register
    and ignores the mask. After talking to our hdmi experts, mtk_cec_mask()
    should read a register, clean only mask bits, and update (val | mask) bits
    to the register.

    Link: https://patchwork.kernel.org/project/linux-mediatek/patch/20220315232301.2434-1-miles.chen@mediatek.com/
    Fixes: 8f83f26891e1 ("drm/mediatek: Add HDMI support")
    Signed-off-by: Miles Chen <miles.chen@mediatek.com>
    Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
    Reviewed-by: Matthias Brugger <matthias.bgg@gmail.com>
    Cc: Zhiqiang Lin <zhiqiang.lin@mediatek.com>
    Cc: CK Hu <ck.hu@mediatek.com>
    Cc: Matthias Brugger <matthias.bgg@gmail.com>
    Cc: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
    Signed-off-by: Chun-Kuang Hu <chunkuang.hu@kernel.org>
    Signed-off-by: Sasha Levin <sashal@kernel.org>
    ---
    drivers/gpu/drm/mediatek/mtk_cec.c | 2 +-
    1 file changed, 1 insertion(+), 1 deletion(-)

    diff --git a/drivers/gpu/drm/mediatek/mtk_cec.c b/drivers/gpu/drm/mediatek/mtk_cec.c
    index e9cef5c0c8f7..cdfa648910b2 100644
    --- a/drivers/gpu/drm/mediatek/mtk_cec.c
    +++ b/drivers/gpu/drm/mediatek/mtk_cec.c
    @@ -85,7 +85,7 @@ static void mtk_cec_mask(struct mtk_cec *cec, unsigned int offset,
    u32 tmp = readl(cec->regs + offset) & ~mask;

    tmp |= val & mask;
    - writel(val, cec->regs + offset);
    + writel(tmp, cec->regs + offset);
    }

    void mtk_cec_set_hpd_event(struct device *dev,
    --
    2.35.1


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