clk: qcom: videocc-sm8250: use runtime PM for the clock controller

On sm8250 dispcc and videocc registers are powered up by the MMCX power
domain. Use runtime PM calls to make sure that required power domain is
powered on while we access clock controller's registers.

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Link: https://lore.kernel.org/r/20210829154757.784699-5-dmitry.baryshkov@linaro.org
Signed-off-by: Stephen Boyd <sboyd@kernel.org>

diff --git a/drivers/clk/qcom/videocc-sm8250.c b/drivers/clk/qcom/videocc-sm8250.c
index 7b435a1c2c4b56606d8665ba9b7df61485b880b7..8617454e4a77c35f2c47f345b333dab3323ab7b3 100644 (file)
--- a/drivers/clk/qcom/videocc-sm8250.c
+++ b/drivers/clk/qcom/videocc-sm8250.c
@@ -6,6 +6,7 @@
 #include <linux/clk-provider.h>
 #include <linux/module.h>
 #include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
 #include <linux/regmap.h>
 
 #include <dt-bindings/clock/qcom,videocc-sm8250.h>
@@ -364,13 +365,31 @@ static const struct of_device_id video_cc_sm8250_match_table[] = {
 };
 MODULE_DEVICE_TABLE(of, video_cc_sm8250_match_table);
 
+static void video_cc_sm8250_pm_runtime_disable(void *data)
+{
+       pm_runtime_disable(data);
+}
+
 static int video_cc_sm8250_probe(struct platform_device *pdev)
 {
        struct regmap *regmap;
+       int ret;
+
+       pm_runtime_enable(&pdev->dev);
+
+       ret = devm_add_action_or_reset(&pdev->dev, video_cc_sm8250_pm_runtime_disable, &pdev->dev);
+       if (ret)
+               return ret;
+
+       ret = pm_runtime_resume_and_get(&pdev->dev);
+       if (ret)
+               return ret;
 
        regmap = qcom_cc_map(pdev, &video_cc_sm8250_desc);
-       if (IS_ERR(regmap))
+       if (IS_ERR(regmap)) {
+               pm_runtime_put(&pdev->dev);
                return PTR_ERR(regmap);
+       }
 
        clk_lucid_pll_configure(&video_pll0, regmap, &video_pll0_config);
        clk_lucid_pll_configure(&video_pll1, regmap, &video_pll1_config);
@@ -379,7 +398,11 @@ static int video_cc_sm8250_probe(struct platform_device *pdev)
        regmap_update_bits(regmap, 0xe58, BIT(0), BIT(0));
        regmap_update_bits(regmap, 0xeec, BIT(0), BIT(0));
 
-       return qcom_cc_really_probe(pdev, &video_cc_sm8250_desc, regmap);
+       ret = qcom_cc_really_probe(pdev, &video_cc_sm8250_desc, regmap);
+
+       pm_runtime_put(&pdev->dev);
+
+       return ret;
 }
 
 static struct platform_driver video_cc_sm8250_driver = {