From: Jitao Shi Date: Mon, 17 Aug 2020 13:06:40 +0000 (+0800) Subject: drm/mediatek: dsi: Fix scrolling of panel with small hfp or hbp X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=35bf948f1edbf507f6e57e0879fa6ea36d2d2930;p=linux.git drm/mediatek: dsi: Fix scrolling of panel with small hfp or hbp 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 Signed-off-by: Chun-Kuang Hu --- diff --git a/drivers/gpu/drm/mediatek/mtk_dsi.c b/drivers/gpu/drm/mediatek/mtk_dsi.c index 16fd99dcdacf8..80b7a082e8740 100644 --- a/drivers/gpu/drm/mediatek/mtk_dsi.c +++ b/drivers/gpu/drm/mediatek/mtk_dsi.c @@ -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 >