linux-kernel - [PATCH 2/2] clk: qcom: sm8250-dispcc: Flag shared RCGs as assumed enable

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Date:   Thu,  2 Dec 2021 19:54:36 -0800
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        dmitry.baryshkov@...aro.org
Cc:     linux-clk@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-msm@...r.kernel.org
Subject: [PATCH 2/2] clk: qcom: sm8250-dispcc: Flag shared RCGs as assumed enable

The state of the shared RCGs found in the SM8250 dispcc can't reliably
be queried and hence doesn't implement the is_enabled() callback.

Mark the shared RCGs as CLK_ASSUME_ENABLED_WHEN_UNUSED, to ensure that
clk_disable_unused() will issue a disable and park the RCGs before it
turns off the parent PLLs - which will lock up these RCGs in any system
with continuous splash enabled.

Signed-off-by: Bjorn Andersson <bjorn.andersson@...aro.org>
---
 drivers/clk/qcom/dispcc-sm8250.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/clk/qcom/dispcc-sm8250.c b/drivers/clk/qcom/dispcc-sm8250.c
index 2842e2b6f4a4..f7c7c829553e 100644
--- a/drivers/clk/qcom/dispcc-sm8250.c
+++ b/drivers/clk/qcom/dispcc-sm8250.c
@@ -218,7 +218,7 @@ static struct clk_rcg2 disp_cc_mdss_ahb_clk_src = {
 		.name = "disp_cc_mdss_ahb_clk_src",
 		.parent_data = disp_cc_parent_data_3,
 		.num_parents = ARRAY_SIZE(disp_cc_parent_data_3),
-		.flags = CLK_SET_RATE_PARENT,
+		.flags = CLK_SET_RATE_PARENT | CLK_ASSUME_ENABLED_WHEN_UNUSED,
 		.ops = &clk_rcg2_shared_ops,
 	},
 };
@@ -550,7 +550,7 @@ static struct clk_rcg2 disp_cc_mdss_mdp_clk_src = {
 		.name = "disp_cc_mdss_mdp_clk_src",
 		.parent_data = disp_cc_parent_data_5,
 		.num_parents = ARRAY_SIZE(disp_cc_parent_data_5),
-		.flags = CLK_SET_RATE_PARENT,
+		.flags = CLK_SET_RATE_PARENT | CLK_ASSUME_ENABLED_WHEN_UNUSED,
 		.ops = &clk_rcg2_shared_ops,
 	},
 };
@@ -602,7 +602,7 @@ static struct clk_rcg2 disp_cc_mdss_rot_clk_src = {
 		.name = "disp_cc_mdss_rot_clk_src",
 		.parent_data = disp_cc_parent_data_5,
 		.num_parents = ARRAY_SIZE(disp_cc_parent_data_5),
-		.flags = CLK_SET_RATE_PARENT,
+		.flags = CLK_SET_RATE_PARENT | CLK_ASSUME_ENABLED_WHEN_UNUSED,
 		.ops = &clk_rcg2_shared_ops,
 	},
 };
-- 
2.33.1