linux-kernel - [PATCH v4 4/5] clk: qcom: Use HW_CTRL_TRIGGER flag to switch video GDSC to HW mode

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Message-Id: <20240122-gdsc-hwctrl-v4-4-9061e8a7aa07@linaro.org>
Date: Mon, 22 Jan 2024 10:47:04 +0200
From: Abel Vesa <abel.vesa@...aro.org>
To: "Rafael J. Wysocki" <rafael@...nel.org>, 
 Kevin Hilman <khilman@...nel.org>, Ulf Hansson <ulf.hansson@...aro.org>, 
 Pavel Machek <pavel@....cz>, Len Brown <len.brown@...el.com>, 
 Greg Kroah-Hartman <gregkh@...uxfoundation.org>, 
 Bjorn Andersson <andersson@...nel.org>, Andy Gross <agross@...nel.org>, 
 Konrad Dybcio <konrad.dybcio@...aro.org>, 
 Michael Turquette <mturquette@...libre.com>, 
 Stephen Boyd <sboyd@...nel.org>, 
 Stanimir Varbanov <stanimir.k.varbanov@...il.com>, 
 Vikash Garodia <quic_vgarodia@...cinc.com>, 
 Bryan O'Donoghue <bryan.odonoghue@...aro.org>, 
 Mauro Carvalho Chehab <mchehab@...nel.org>, 
 Taniya Das <quic_tdas@...cinc.com>, Jagadeesh Kona <quic_jkona@...cinc.com>, 
 Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
Cc: linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org, 
 linux-arm-msm@...r.kernel.org, linux-clk@...r.kernel.org, 
 linux-media@...r.kernel.org, Abel Vesa <abel.vesa@...aro.org>
Subject: [PATCH v4 4/5] clk: qcom: Use HW_CTRL_TRIGGER flag to switch video
 GDSC to HW mode

From: Jagadeesh Kona <quic_jkona@...cinc.com>

The current HW_CTRL flag switches the video GDSC to HW control mode as
part of GDSC enable itself, and HW can disable the GDSC right after the
GDSC is moved to HW mode. This can lead to subsequent video clock enable
failures that are dependent on the GDSC if GDSC is collapsed by HW. Also,
while few video hardware registers are being programmed by TZ, GDSC
should be in non collapsed state which can be achieved by keeping
it in SW mode.

Use HW_CTRL_TRIGGER flag instead which allows consumer drivers to switch
the video GDSC to HW/SW control modes at runtime using
dev_pm_genpd_set_hwmode API as per the requirement.

Signed-off-by: Jagadeesh Kona <quic_jkona@...cinc.com>
Signed-off-by: Abel Vesa <abel.vesa@...aro.org>
---
 drivers/clk/qcom/videocc-sc7280.c | 2 +-
 drivers/clk/qcom/videocc-sm8250.c | 4 ++--
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/clk/qcom/videocc-sc7280.c b/drivers/clk/qcom/videocc-sc7280.c
index 615695d82319..3d07b1e95986 100644
--- a/drivers/clk/qcom/videocc-sc7280.c
+++ b/drivers/clk/qcom/videocc-sc7280.c
@@ -236,7 +236,7 @@ static struct gdsc mvs0_gdsc = {
 		.name = "mvs0_gdsc",
 	},
 	.pwrsts = PWRSTS_OFF_ON,
-	.flags = HW_CTRL | RETAIN_FF_ENABLE,
+	.flags = HW_CTRL_TRIGGER | RETAIN_FF_ENABLE,
 };

 static struct gdsc mvsc_gdsc = {
diff --git a/drivers/clk/qcom/videocc-sm8250.c b/drivers/clk/qcom/videocc-sm8250.c
index ad46c4014a40..c1b73d852f1c 100644
--- a/drivers/clk/qcom/videocc-sm8250.c
+++ b/drivers/clk/qcom/videocc-sm8250.c
@@ -293,7 +293,7 @@ static struct gdsc mvs0_gdsc = {
 	.pd = {
 		.name = "mvs0_gdsc",
 	},
-	.flags = HW_CTRL,
+	.flags = HW_CTRL_TRIGGER,
 	.pwrsts = PWRSTS_OFF_ON,
 };

@@ -302,7 +302,7 @@ static struct gdsc mvs1_gdsc = {
 	.pd = {
 		.name = "mvs1_gdsc",
 	},
-	.flags = HW_CTRL,
+	.flags = HW_CTRL_TRIGGER,
 	.pwrsts = PWRSTS_OFF_ON,
 };

-- 
2.34.1