linux-kernel - Re: [PATCH v1 4/5] media: rkvdec: Re-enable H.264 error detection

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Date:   Fri, 10 Jun 2022 16:48:16 +0300
From:   Dmitry Osipenko <dmitry.osipenko@...labora.com>
To:     Dan Carpenter <dan.carpenter@...cle.com>,
        Nicolas Dufresne <nicolas.dufresne@...labora.com>
Cc:     linux-media@...r.kernel.org,
        Ezequiel Garcia <ezequiel@...guardiasur.com.ar>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        kernel@...labora.com, linux-rockchip@...ts.infradead.org,
        linux-staging@...ts.linux.dev, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1 4/5] media: rkvdec: Re-enable H.264 error detection

On 6/10/22 16:20, Dan Carpenter wrote:
> On Fri, Jun 10, 2022 at 08:52:14AM -0400, Nicolas Dufresne wrote:
>> This re-enables H.264 error detection, but using the other error mode.
>> In that mode, the decoder will skip over the error macro-block or
>> slices and complete the decoding. As a side effect, the error status
>> is not set in the interrupt status register, and instead errors are
>> detected per format. Using this mode workaround the issue that the
>> HW get stuck in error stated and allow reporting that some corruption
>> may be present in the buffer returned to userland.
>>
>> Signed-off-by: Nicolas Dufresne <nicolas.dufresne@...labora.com>
>> ---
>>  drivers/staging/media/rkvdec/rkvdec-h264.c | 23 +++++++++++++++++++---
>>  1 file changed, 20 insertions(+), 3 deletions(-)
>>
>> diff --git a/drivers/staging/media/rkvdec/rkvdec-h264.c b/drivers/staging/media/rkvdec/rkvdec-h264.c
>> index 55596ce6bb6e..60a89918e2c1 100644
>> --- a/drivers/staging/media/rkvdec/rkvdec-h264.c
>> +++ b/drivers/staging/media/rkvdec/rkvdec-h264.c
>> @@ -1175,14 +1175,15 @@ static int rkvdec_h264_run(struct rkvdec_ctx *ctx)
>>  
>>  	schedule_delayed_work(&rkvdec->watchdog_work, msecs_to_jiffies(2000));
>>  
>> -	writel(0, rkvdec->regs + RKVDEC_REG_STRMD_ERR_EN);
>> -	writel(0, rkvdec->regs + RKVDEC_REG_H264_ERR_E);
>> +	writel(0xffffffff, rkvdec->regs + RKVDEC_REG_STRMD_ERR_EN);
>> +	writel(0xffffffff, rkvdec->regs + RKVDEC_REG_H264_ERR_E);
> 
> This reverts the changes in patch 1/5.  Could we just skip patch 1/5
> instead?

The first patch must go to the stable kernels, hence we couldn't skip it.

-- 
Best regards,
Dmitry