From bde7ef2bf80fb7e7317cd58b1ccd6cfaa89b9ff4 Mon Sep 17 00:00:00 2001
From: Xinlei Lee <xinlei.lee@mediatek.com>
Date: Fri, 20 May 2022 10:00:07 +0800
Subject: drm/mediatek: Add pull-down MIPI operation in mtk_dsi_poweroff
function
Git-commit: fa5d0a0205c34734c5b8daa77e39ac2817f63a10
Patch-mainline: v6.0-rc1
References: jsc#PED-1166 jsc#PED-1168 jsc#PED-1170 jsc#PED-1218 jsc#PED-1220 jsc#PED-1222 jsc#PED-1223 jsc#PED-1225 jsc#PED-2849
In the dsi_enable function, mtk_dsi_rxtx_control is to
pull up the MIPI signal operation. Before dsi_disable,
MIPI should also be pulled down by writing a register
instead of disabling dsi.
If disable dsi without pulling the mipi signal low, the value of
the register will still maintain the setting of the mipi signal being
pulled high.
After resume, even if the mipi signal is not pulled high, it will still
be in the high state.
Fixes: 2e54c14e310f ("drm/mediatek: Add DSI sub driver")
Link: https://patchwork.kernel.org/project/linux-mediatek/patch/1653012007-11854-5-git-send-email-xinlei.lee@mediatek.com/
Signed-off-by: Jitao Shi <jitao.shi@mediatek.com>
Signed-off-by: Xinlei Lee <xinlei.lee@mediatek.com>
Reviewed-by: Rex-BC Chen <rex-bc.chen@mediatek.com>
Signed-off-by: Chun-Kuang Hu <chunkuang.hu@kernel.org>
Acked-by: Patrik Jakobsson <pjakobsson@suse.de>
---
drivers/gpu/drm/mediatek/mtk_dsi.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/drivers/gpu/drm/mediatek/mtk_dsi.c b/drivers/gpu/drm/mediatek/mtk_dsi.c
index 907d07eda000..af2f123e9a9a 100644
--- a/drivers/gpu/drm/mediatek/mtk_dsi.c
+++ b/drivers/gpu/drm/mediatek/mtk_dsi.c
@@ -688,6 +688,8 @@ static void mtk_dsi_poweroff(struct mtk_dsi *dsi)
mtk_dsi_reset_engine(dsi);
mtk_dsi_lane0_ulp_mode_enter(dsi);
mtk_dsi_clk_ulp_mode_enter(dsi);
+ /* set the lane number as 0 to pull down mipi */
+ writel(0, dsi->regs + DSI_TXRX_CTRL);
mtk_dsi_disable(dsi);
--
2.38.1