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Message-ID: <cd524923-93f0-e15c-816f-595a80184206@microchip.com>
Date: Thu, 10 Jun 2021 09:04:07 +0000
From: <Eugen.Hristev@...rochip.com>
To: <Jonathan.Cameron@...wei.com>, <mchehab+huawei@...nel.org>
CC: <linuxarm@...wei.com>, <mauro.chehab@...wei.com>,
<alexandre.belloni@...tlin.com>, <Ludovic.Desroches@...rochip.com>,
<mchehab@...nel.org>, <Nicolas.Ferre@...rochip.com>,
<linux-arm-kernel@...ts.infradead.org>,
<linux-kernel@...r.kernel.org>, <linux-media@...r.kernel.org>,
<Claudiu.Beznea@...rochip.com>
Subject: Re: [PATCH 08/25] media: atmel: properly get pm_runtime
On 5/5/21 3:08 PM, Jonathan Cameron wrote:
> On Wed, 5 May 2021 11:41:58 +0200
> Mauro Carvalho Chehab <mchehab+huawei@...nel.org> wrote:
>
>> 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: Mauro Carvalho Chehab <mchehab+huawei@...nel.org>
>
> Hi Mauro, I don't know media enough to know what is the right answer
> but in some of this series, a failure in
> pm_runtime_resume_and_get() leads to a bunch of buffer cleanup
> (patch 22 being an example) and in others return happens without doing
> that cleanup.
>
> It might be both are safe, or I'm missing something else, but I'm
> certainly not confident enough to give any tags on this one as a result
> of that mismatch.
>
>> ---
>> drivers/media/platform/atmel/atmel-isc-base.c | 30 ++++++++++++++-----
>> drivers/media/platform/atmel/atmel-isi.c | 19 +++++++++---
>> 2 files changed, 38 insertions(+), 11 deletions(-)
>>
>> 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 ?
Thanks !
Eugen
>>
>> 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
>> diff --git a/drivers/media/platform/atmel/atmel-isi.c b/drivers/media/platform/atmel/atmel-isi.c
>> index e392b3efe363..5b1dd358f2e6 100644
>> --- a/drivers/media/platform/atmel/atmel-isi.c
>> +++ b/drivers/media/platform/atmel/atmel-isi.c
>> @@ -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;
> This is the case I'm referring to above.
>
>>
>> /* 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) {
>
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