Em Thu, 10 Jun 2021 09:04:07 +0000
[off-list ref] escreveu:

quoted

quoted

diff --git a/drivers/media/platform/atmel/atmel-isc-base.c b/drivers/media/platform/atmel/atmel-isc-base.c
index fe3ec8d0eaee..ce8e1351fa53 100644
--- a/drivers/media/platform/atmel/atmel-isc-base.c
+++ b/drivers/media/platform/atmel/atmel-isc-base.c

@@ -294,9 +294,13 @@ static int isc_wait_clk_stable(struct clk_hw *hw)
  static int isc_clk_prepare(struct clk_hw *hw)
  {
       struct isc_clk *isc_clk = to_isc_clk(hw);
+     int ret;

-     if (isc_clk->id == ISC_ISPCK)
-             pm_runtime_get_sync(isc_clk->dev);
+     if (isc_clk->id == ISC_ISPCK) {
+             ret = pm_runtime_resume_and_get(isc_clk->dev);
+             if (ret < 0)
+                     return ret;
+     }  

Hi Mauro,

With this patch, the ISC is broken on latest media tree. It looks like 
pm_runtime_resume_and_get for the ISC_ISPCK clock returns -ENOACCESS and 
thus, the probe of the driver fails:

atmel-sama5d2-isc f0008000.isc: failed to enable ispck: -13
atmel-sama5d2-isc: probe of f0008000.isc failed with error -13


Could you point out how I could fix this ? Maybe the isc_clk->dev is not 
properly handled/initialized in some other part of the code ?

Looking at RPM implementation:

	static int rpm_resume(struct device *dev, int rpmflags)
	{
...
        if (dev->power.runtime_error)
                retval = -EINVAL;
        else if (dev->power.disable_depth == 1 && dev->power.is_suspended
            && dev->power.runtime_status == RPM_ACTIVE)
                retval = 1;
        else if (dev->power.disable_depth > 0)
                retval = -EACCES;
...

It sounds that RPM is disabled for this clock. Did you call
pm_runtime_enable() before calling isc_clk_prepare()?

Thanks,
Mauro

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