This is a note to let you know that I've just added the patch titled
clk: qcom: dispcc: Update the transition delay for MDSS GDSC
to the 5.16-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
clk-qcom-dispcc-update-the-transition-delay-for-mdss.patch
and it can be found in the queue-5.16 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 617d854ad38a8fd50a2feaa417faeff6b29d45d7
Author: Taniya Das <tdas@xxxxxxxxxxxxxx>
Date: Thu Feb 24 00:26:06 2022 +0530
clk: qcom: dispcc: Update the transition delay for MDSS GDSC
[ Upstream commit 6e6fec3f961c00ca34ffb4bf2ad9febb4b499f8d ]
On SC7180 we observe black screens because the gdsc is being
enabled/disabled very rapidly and the GDSC FSM state does not work as
expected. This is due to the fact that the GDSC reset value is being
updated from SW.
The recommended transition delay for mdss core gdsc updated for
SC7180/SC7280/SM8250.
Fixes: dd3d06622138 ("clk: qcom: Add display clock controller driver for SC7180")
Fixes: 1a00c962f9cd ("clk: qcom: Add display clock controller driver for SC7280")
Fixes: 80a18f4a8567 ("clk: qcom: Add display clock controller driver for SM8150 and SM8250")
Signed-off-by: Taniya Das <tdas@xxxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20220223185606.3941-2-tdas@xxxxxxxxxxxxxx
Reviewed-by: Bjorn Andersson <bjorn.andersson@xxxxxxxxxx>
[sboyd@xxxxxxxxxx: lowercase hex]
Signed-off-by: Stephen Boyd <sboyd@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/clk/qcom/dispcc-sc7180.c b/drivers/clk/qcom/dispcc-sc7180.c
index 538e4963c915..5d2ae297e741 100644
--- a/drivers/clk/qcom/dispcc-sc7180.c
+++ b/drivers/clk/qcom/dispcc-sc7180.c
@@ -1,6 +1,6 @@
// SPDX-License-Identifier: GPL-2.0-only
/*
- * Copyright (c) 2019, The Linux Foundation. All rights reserved.
+ * Copyright (c) 2019, 2022, The Linux Foundation. All rights reserved.
*/
#include <linux/clk-provider.h>
@@ -625,6 +625,9 @@ static struct clk_branch disp_cc_mdss_vsync_clk = {
static struct gdsc mdss_gdsc = {
.gdscr = 0x3000,
+ .en_rest_wait_val = 0x2,
+ .en_few_wait_val = 0x2,
+ .clk_dis_wait_val = 0xf,
.pd = {
.name = "mdss_gdsc",
},
diff --git a/drivers/clk/qcom/dispcc-sc7280.c b/drivers/clk/qcom/dispcc-sc7280.c
index 4ef4ae231794..ad596d567f6a 100644
--- a/drivers/clk/qcom/dispcc-sc7280.c
+++ b/drivers/clk/qcom/dispcc-sc7280.c
@@ -1,6 +1,6 @@
// SPDX-License-Identifier: GPL-2.0-only
/*
- * Copyright (c) 2021, The Linux Foundation. All rights reserved.
+ * Copyright (c) 2021-2022, The Linux Foundation. All rights reserved.
*/
#include <linux/clk-provider.h>
@@ -787,6 +787,9 @@ static struct clk_branch disp_cc_sleep_clk = {
static struct gdsc disp_cc_mdss_core_gdsc = {
.gdscr = 0x1004,
+ .en_rest_wait_val = 0x2,
+ .en_few_wait_val = 0x2,
+ .clk_dis_wait_val = 0xf,
.pd = {
.name = "disp_cc_mdss_core_gdsc",
},
diff --git a/drivers/clk/qcom/dispcc-sm8250.c b/drivers/clk/qcom/dispcc-sm8250.c
index 566fdfa0a15b..db9379634fb2 100644
--- a/drivers/clk/qcom/dispcc-sm8250.c
+++ b/drivers/clk/qcom/dispcc-sm8250.c
@@ -1,6 +1,6 @@
// SPDX-License-Identifier: GPL-2.0
/*
- * Copyright (c) 2018-2020, The Linux Foundation. All rights reserved.
+ * Copyright (c) 2018-2020, 2022, The Linux Foundation. All rights reserved.
*/
#include <linux/clk-provider.h>
@@ -1126,6 +1126,9 @@ static struct clk_branch disp_cc_mdss_vsync_clk = {
static struct gdsc mdss_gdsc = {
.gdscr = 0x3000,
+ .en_rest_wait_val = 0x2,
+ .en_few_wait_val = 0x2,
+ .clk_dis_wait_val = 0xf,
.pd = {
.name = "mdss_gdsc",
},
