The patch below does not apply to the 4.9-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable@xxxxxxxxxxxxxxx>.
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
>From 3b2a999582c467d1883716b37ffcc00178a13713 Mon Sep 17 00:00:00 2001
From: Liu Ying <victor.liu@xxxxxxx>
Date: Thu, 9 Jul 2020 10:28:52 +0800
Subject: [PATCH] drm/imx: imx-ldb: Disable both channels for split mode in
enc->disable()
Both of the two LVDS channels should be disabled for split mode
in the encoder's ->disable() callback, because they are enabled
in the encoder's ->enable() callback.
Fixes: 6556f7f82b9c ("drm: imx: Move imx-drm driver out of staging")
Cc: Philipp Zabel <p.zabel@xxxxxxxxxxxxxx>
Cc: Sascha Hauer <s.hauer@xxxxxxxxxxxxxx>
Cc: Pengutronix Kernel Team <kernel@xxxxxxxxxxxxxx>
Cc: NXP Linux Team <linux-imx@xxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx>
Signed-off-by: Liu Ying <victor.liu@xxxxxxx>
Signed-off-by: Philipp Zabel <p.zabel@xxxxxxxxxxxxxx>
diff --git a/drivers/gpu/drm/imx/imx-ldb.c b/drivers/gpu/drm/imx/imx-ldb.c
index 909682a74474..8791d60be92e 100644
--- a/drivers/gpu/drm/imx/imx-ldb.c
+++ b/drivers/gpu/drm/imx/imx-ldb.c
@@ -296,18 +296,19 @@ static void imx_ldb_encoder_disable(struct drm_encoder *encoder)
{
struct imx_ldb_channel *imx_ldb_ch = enc_to_imx_ldb_ch(encoder);
struct imx_ldb *ldb = imx_ldb_ch->ldb;
+ int dual = ldb->ldb_ctrl & LDB_SPLIT_MODE_EN;
int mux, ret;
drm_panel_disable(imx_ldb_ch->panel);
- if (imx_ldb_ch == &ldb->channel[0])
+ if (imx_ldb_ch == &ldb->channel[0] || dual)
ldb->ldb_ctrl &= ~LDB_CH0_MODE_EN_MASK;
- else if (imx_ldb_ch == &ldb->channel[1])
+ if (imx_ldb_ch == &ldb->channel[1] || dual)
ldb->ldb_ctrl &= ~LDB_CH1_MODE_EN_MASK;
regmap_write(ldb->regmap, IOMUXC_GPR2, ldb->ldb_ctrl);
- if (ldb->ldb_ctrl & LDB_SPLIT_MODE_EN) {
+ if (dual) {
clk_disable_unprepare(ldb->clk[0]);
clk_disable_unprepare(ldb->clk[1]);
}
