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-rw-r--r--board/chromebook/elm/patches/linux/0006-Revert-drm-mediatek-dsi-Fix-scrolling-of-panel-with-.patch41
1 files changed, 41 insertions, 0 deletions
diff --git a/board/chromebook/elm/patches/linux/0006-Revert-drm-mediatek-dsi-Fix-scrolling-of-panel-with-.patch b/board/chromebook/elm/patches/linux/0006-Revert-drm-mediatek-dsi-Fix-scrolling-of-panel-with-.patch
new file mode 100644
index 0000000000..43bffe5261
--- /dev/null
+++ b/board/chromebook/elm/patches/linux/0006-Revert-drm-mediatek-dsi-Fix-scrolling-of-panel-with-.patch
@@ -0,0 +1,41 @@
+From 51109530891c981b681816152bd205724deabcca Mon Sep 17 00:00:00 2001
+From: Jitao Shi <jitao.shi@mediatek.com>
+Date: Sat, 10 Oct 2020 15:09:09 +0800
+Subject: [PATCH] Revert "drm/mediatek: dsi: Fix scrolling of panel with small
+ hfp or hbp"
+
+This reverts commit 35bf948f1edbf507f6e57e0879fa6ea36d2d2930.
+
+Signed-off-by: Jitao Shi <jitao.shi@mediatek.com>
+Reviewed-by: Bilal Wasim <bilal.wasim@imgtec.com>
+Tested-by: Bilal Wasim <bilal.wasim@imgtec.com>
+---
+ drivers/gpu/drm/mediatek/mtk_dsi.c | 9 +++++----
+ 1 file changed, 5 insertions(+), 4 deletions(-)
+
+diff --git a/drivers/gpu/drm/mediatek/mtk_dsi.c b/drivers/gpu/drm/mediatek/mtk_dsi.c
+index 80b7a082e874..16fd99dcdacf 100644
+--- a/drivers/gpu/drm/mediatek/mtk_dsi.c
++++ b/drivers/gpu/drm/mediatek/mtk_dsi.c
+@@ -466,13 +466,14 @@ 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;
++ horizontal_backporch_byte =
++ (vm->hback_porch * dsi_tmp_buf_bpp - 10);
+ else
+- horizontal_backporch_byte = (vm->hback_porch + vm->hsync_len) *
+- dsi_tmp_buf_bpp;
++ horizontal_backporch_byte = ((vm->hback_porch + vm->hsync_len) *
++ dsi_tmp_buf_bpp - 10);
+
+ data_phy_cycles = timing->lpx + timing->da_hs_prepare +
+- timing->da_hs_zero + timing->da_hs_exit;
++ timing->da_hs_zero + timing->da_hs_exit + 3;
+
+ if (dsi->mode_flags & MIPI_DSI_MODE_VIDEO_BURST) {
+ if ((vm->hfront_porch + vm->hback_porch) * dsi_tmp_buf_bpp >
+--
+2.25.1
+