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drm/mediatek: dsi: Fix scrolling of panel with small hfp or hbp

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

Fixes: 7a5bc4e22e ("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>
This commit is contained in:
Jitao Shi 2020-08-17 21:06:40 +08:00 committed by Chun-Kuang Hu
parent 9123e3a74e
commit 35bf948f1e
1 changed files with 4 additions and 5 deletions
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9
drivers/gpu/drm/mediatek/mtk_dsi.c
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@ -466,14 +466,13 @@ 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 >