Commit dd97908e authored by Mauro Carvalho Chehab's avatar Mauro Carvalho Chehab
Browse files

media: atmel: properly get pm_runtime 



There are several issues in the way the atmel driver handles
pm_runtime_get_sync():

- it doesn't check return codes;
- it doesn't properly decrement the usage_count on all places;
- it starts streaming even if pm_runtime_get_sync() fails.
- while it tries to get pm_runtime at the clock enable logic,
  it doesn't check if the operation was suceeded.

Replace all occurrences of it to use the new kAPI:
pm_runtime_resume_and_get(), which ensures that, if the
return code is not negative, the usage_count was incremented.

With that, add additional checks when this is called, in order
to ensure that errors will be properly addressed.

Signed-off-by: default avatarMauro Carvalho Chehab <mchehab+huawei@kernel.org>
parent e6695c89

drivers/media/platform/atmel/atmel-isc-base.c

+23 −7
Original line number Diff line number Diff line
@@ -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;

	}



	return isc_wait_clk_stable(hw);

}
@@ -353,9 +357,13 @@ static int isc_clk_is_enabled(struct clk_hw *hw) 
{

	struct isc_clk *isc_clk = to_isc_clk(hw);

	u32 status;

	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 0;

	}



	regmap_read(isc_clk->regmap, ISC_CLKSR, &status);
@@ -807,7 +815,12 @@ static int isc_start_streaming(struct vb2_queue *vq, unsigned int count) 
		goto err_start_stream;

	}



	pm_runtime_get_sync(isc->dev);

	ret = pm_runtime_resume_and_get(isc->dev);

	if (ret < 0) {

		v4l2_err(&isc->v4l2_dev, "RPM resume failed in subdev %d\n",

			 ret);

		goto err_pm_get;

	}



	ret = isc_configure(isc);

	if (unlikely(ret))
@@ -838,7 +851,7 @@ static int isc_start_streaming(struct vb2_queue *vq, unsigned int count) 


err_configure:

	pm_runtime_put_sync(isc->dev);



err_pm_get:

	v4l2_subdev_call(isc->current_subdev->sd, video, s_stream, 0);



err_start_stream:
@@ -1809,6 +1822,7 @@ static void isc_awb_work(struct work_struct *w) 
	u32 baysel;

	unsigned long flags;

	u32 min, max;

	int ret;



	/* streaming is not active anymore */

	if (isc->stop)
@@ -1831,7 +1845,9 @@ static void isc_awb_work(struct work_struct *w) 
	ctrls->hist_id = hist_id;

	baysel = isc->config.sd_format->cfa_baycfg << ISC_HIS_CFG_BAYSEL_SHIFT;



	pm_runtime_get_sync(isc->dev);

	ret = pm_runtime_resume_and_get(isc->dev);

	if (ret < 0)

		return;



	/*

	 * only update if we have all the required histograms and controls

drivers/media/platform/atmel/atmel-isi.c

+15 −4
Original line number Diff line number Diff line
@@ -422,7 +422,9 @@ static int start_streaming(struct vb2_queue *vq, unsigned int count) 
	struct frame_buffer *buf, *node;

	int ret;



	pm_runtime_get_sync(isi->dev);

	ret = pm_runtime_resume_and_get(isi->dev);

	if (ret < 0)

		return ret;



	/* Enable stream on the sub device */

	ret = v4l2_subdev_call(isi->entity.subdev, video, s_stream, 1);
@@ -782,9 +784,10 @@ static int isi_enum_frameintervals(struct file *file, void *fh, 
	return 0;

}



static void isi_camera_set_bus_param(struct atmel_isi *isi)

static int isi_camera_set_bus_param(struct atmel_isi *isi)

{

	u32 cfg1 = 0;

	int ret;



	/* set bus param for ISI */

	if (isi->pdata.hsync_act_low)
@@ -801,12 +804,16 @@ static void isi_camera_set_bus_param(struct atmel_isi *isi) 
	cfg1 |= ISI_CFG1_THMASK_BEATS_16;



	/* Enable PM and peripheral clock before operate isi registers */

	pm_runtime_get_sync(isi->dev);

	ret = pm_runtime_resume_and_get(isi->dev);

	if (ret < 0)

		return ret;



	isi_writel(isi, ISI_CTRL, ISI_CTRL_DIS);

	isi_writel(isi, ISI_CFG1, cfg1);



	pm_runtime_put(isi->dev);



	return 0;

}



/* -----------------------------------------------------------------------*/
@@ -1085,7 +1092,11 @@ static int isi_graph_notify_complete(struct v4l2_async_notifier *notifier) 
		dev_err(isi->dev, "No supported mediabus format found\n");

		return ret;

	}

	isi_camera_set_bus_param(isi);

	ret = isi_camera_set_bus_param(isi);

	if (ret) {

		dev_err(isi->dev, "Can't wake up device\n");

		return ret;

	}



	ret = isi_set_default_fmt(isi);

	if (ret) {