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    Subject[PATCH 5.8 045/118] drm/mediatek: dsi: Fix scrolling of panel with small hfp or hbp
    Date
    From: Jitao Shi <jitao.shi@mediatek.com>

    [ Upstream commit 35bf948f1edbf507f6e57e0879fa6ea36d2d2930 ]

    horizontal_backporch_byte should be hbp * bpp - hbp extra bytes.
    So remove the wrong subtraction 10.

    Fixes: 7a5bc4e22ecf ("drm/mediatek: change the dsi phytiming calculate method")
    Signed-off-by: Jitao Shi <jitao.shi@mediatek.com>
    Signed-off-by: Chun-Kuang Hu <chunkuang.hu@kernel.org>
    Signed-off-by: Sasha Levin <sashal@kernel.org>
    ---
    drivers/gpu/drm/mediatek/mtk_dsi.c | 9 ++++-----
    1 file changed, 4 insertions(+), 5 deletions(-)

    diff --git a/drivers/gpu/drm/mediatek/mtk_dsi.c b/drivers/gpu/drm/mediatek/mtk_dsi.c
    index 02ac55c13a80b..ee011a0633841 100644
    --- a/drivers/gpu/drm/mediatek/mtk_dsi.c
    +++ b/drivers/gpu/drm/mediatek/mtk_dsi.c
    @@ -470,14 +470,13 @@ static void mtk_dsi_config_vdo_timing(struct mtk_dsi *dsi)
    horizontal_sync_active_byte = (vm->hsync_len * dsi_tmp_buf_bpp - 10);

    if (dsi->mode_flags & MIPI_DSI_MODE_VIDEO_SYNC_PULSE)
    - horizontal_backporch_byte =
    - (vm->hback_porch * dsi_tmp_buf_bpp - 10);
    + horizontal_backporch_byte = vm->hback_porch * dsi_tmp_buf_bpp;
    else
    - horizontal_backporch_byte = ((vm->hback_porch + vm->hsync_len) *
    - dsi_tmp_buf_bpp - 10);
    + horizontal_backporch_byte = (vm->hback_porch + vm->hsync_len) *
    + dsi_tmp_buf_bpp;

    data_phy_cycles = timing->lpx + timing->da_hs_prepare +
    - timing->da_hs_zero + timing->da_hs_exit + 3;
    + timing->da_hs_zero + timing->da_hs_exit;

    if (dsi->mode_flags & MIPI_DSI_MODE_VIDEO_BURST) {
    if ((vm->hfront_porch + vm->hback_porch) * dsi_tmp_buf_bpp >
    --
    2.25.1


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