[PATCH 6.0 0453/1073] clk: qcom: lpass-sc7180: Fix pm_runtime usage

Greg Kroah-Hartman
2022-12-28T15:55:09Z

From: Douglas Anderson <dianders@chromium.org>

[ Upstream commit ff1ccf59eaffd192efe21f7de9fb0c130faf1b1b ]

The sc7180 lpass clock controller's pm_runtime usage wasn't broken
quite as spectacularly as the sc7280's pm_runtime usage, but it was
still broken. Putting some printouts in at boot showed me this (with
serial console enabled, which makes the prints slow and thus changes
timing):
[ 3.109951] DOUG: my_pm_clk_resume, usage=1
[ 3.114767] DOUG: my_pm_clk_resume, usage=1
[ 3.664443] DOUG: my_pm_clk_suspend, usage=0
[ 3.897566] DOUG: my_pm_clk_suspend, usage=0
[ 3.910137] DOUG: my_pm_clk_resume, usage=1
[ 3.923217] DOUG: my_pm_clk_resume, usage=0
[ 4.440116] DOUG: my_pm_clk_suspend, usage=-1
[ 4.444982] DOUG: my_pm_clk_suspend, usage=0
[ 14.170501] DOUG: my_pm_clk_resume, usage=1
[ 14.176245] DOUG: my_pm_clk_resume, usage=0

...or this w/out serial console:
[ 0.556139] DOUG: my_pm_clk_resume, usage=1
[ 0.556279] DOUG: my_pm_clk_resume, usage=1
[ 1.058422] DOUG: my_pm_clk_suspend, usage=-1
[ 1.058464] DOUG: my_pm_clk_suspend, usage=0
[ 1.186250] DOUG: my_pm_clk_resume, usage=1
[ 1.186292] DOUG: my_pm_clk_resume, usage=0
[ 1.731536] DOUG: my_pm_clk_suspend, usage=-1
[ 1.731557] DOUG: my_pm_clk_suspend, usage=0
[ 10.288910] DOUG: my_pm_clk_resume, usage=1
[ 10.289496] DOUG: my_pm_clk_resume, usage=0

It seems to be doing roughly the right sequence of calls, but just
like with sc7280 this is more by luck than anything. Having a usage of
-1 is just not OK.

Let's fix this like we did with sc7280.

Signed-off-by: Douglas Anderson <dianders@chromium.org>
Fixes: ce8c195e652f ("clk: qcom: lpasscc: Introduce pm autosuspend for SC7180")
Reviewed-by: Stephen Boyd <swboyd@chromium.org>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20221104064055.2.I49b25b9bda9430fc7ea21e5a708ca5a0aced2798@changeid
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/clk/qcom/lpasscorecc-sc7180.c | 24 ++++++++++++++++--------
1 file changed, 16 insertions(+), 8 deletions(-)

diff --git a/drivers/clk/qcom/lpasscorecc-sc7180.c b/drivers/clk/qcom/lpasscorecc-sc7180.c
index ac09b7b840ab..a5731994cbed 100644
--- a/drivers/clk/qcom/lpasscorecc-sc7180.c
+++ b/drivers/clk/qcom/lpasscorecc-sc7180.c
@@ -356,7 +356,7 @@ static const struct qcom_cc_desc lpass_audio_hm_sc7180_desc = {
.num_gdscs = ARRAY_SIZE(lpass_audio_hm_sc7180_gdscs),
};

-static int lpass_create_pm_clks(struct platform_device *pdev)
+static int lpass_setup_runtime_pm(struct platform_device *pdev)
{
int ret;

@@ -375,7 +375,7 @@ static int lpass_create_pm_clks(struct platform_device *pdev)
if (ret < 0)
dev_err(&pdev->dev, "failed to acquire iface clock\n");

- return ret;
+ return pm_runtime_resume_and_get(&pdev->dev);
}

static int lpass_core_cc_sc7180_probe(struct platform_device *pdev)
@@ -384,7 +384,7 @@ static int lpass_core_cc_sc7180_probe(struct platform_device *pdev)
struct regmap *regmap;
int ret;

- ret = lpass_create_pm_clks(pdev);
+ ret = lpass_setup_runtime_pm(pdev);
if (ret)
return ret;

@@ -392,12 +392,14 @@ static int lpass_core_cc_sc7180_probe(struct platform_device *pdev)
desc = &lpass_audio_hm_sc7180_desc;
ret = qcom_cc_probe_by_index(pdev, 1, desc);
if (ret)
- return ret;
+ goto exit;

lpass_core_cc_sc7180_regmap_config.name = "lpass_core_cc";
regmap = qcom_cc_map(pdev, &lpass_core_cc_sc7180_desc);
- if (IS_ERR(regmap))
- return PTR_ERR(regmap);
+ if (IS_ERR(regmap)) {
+ ret = PTR_ERR(regmap);
+ goto exit;
+ }

/*
* Keep the CLK always-ON
@@ -415,6 +417,7 @@ static int lpass_core_cc_sc7180_probe(struct platform_device *pdev)
ret = qcom_cc_really_probe(pdev, &lpass_core_cc_sc7180_desc, regmap);

pm_runtime_mark_last_busy(&pdev->dev);
+exit:
pm_runtime_put_autosuspend(&pdev->dev);

return ret;
@@ -425,14 +428,19 @@ static int lpass_hm_core_probe(struct platform_device *pdev)
const struct qcom_cc_desc *desc;
int ret;

- ret = lpass_create_pm_clks(pdev);
+ ret = lpass_setup_runtime_pm(pdev);
if (ret)
return ret;

lpass_core_cc_sc7180_regmap_config.name = "lpass_hm_core";
desc = &lpass_core_hm_sc7180_desc;

- return qcom_cc_probe_by_index(pdev, 0, desc);
+ ret = qcom_cc_probe_by_index(pdev, 0, desc);
+
+ pm_runtime_mark_last_busy(&pdev->dev);
+ pm_runtime_put_autosuspend(&pdev->dev);
+
+ return ret;
}

static const struct of_device_id lpass_hm_sc7180_match_table[] = {
--
2.35.1