Re: [igt-dev] [PATCH i-g-t 2/2] tests/kms_psr2_su: Print debugfs when skipping test

["Souza, Jose" <jose.souza@intel.com>]

On Mon, 2020-06-01 at 11:18 +0300, Petri Latvala wrote:
> On Fri, May 29, 2020 at 06:16:13PM -0700, José Roberto de Souza wrote:
> > This tests is being sporadically skipped in CI as it is not due
> > "PSR sink not reliable: yes" lets print the i915_edp_psr_status to
> > find out the reason.
> > This can be reverted afterwards.
> > 
> > Reference: https://gitlab.freedesktop.org/drm/intel/-/issues/1911
> > Cc: Gwan-gyeong Mun <gwan-gyeong.mun@intel.com>
> > Signed-off-by: José Roberto de Souza <jose.souza@intel.com>
> > ---
> >  lib/igt_psr.c       | 13 +++++++++++++
> >  lib/igt_psr.h       |  1 +
> >  tests/kms_psr2_su.c |  2 ++
> >  3 files changed, 16 insertions(+)
> > 
> > diff --git a/lib/igt_psr.c b/lib/igt_psr.c
> > index 956f6219c..8c2f4ce6c 100644
> > --- a/lib/igt_psr.c
> > +++ b/lib/igt_psr.c
> > @@ -229,3 +229,16 @@ bool psr2_wait_su(int debugfs_fd, uint16_t *num_su_blocks)
> >  {
> >  	return igt_wait(psr2_read_last_num_su_blocks_val(debugfs_fd, num_su_blocks), 40, 1);
> >  }
> > +
> > +void psr_print_debugfs(int debugfs_fd)
> > +{
> > +	char buf[PSR_STATUS_MAX_LEN];
> > +	int ret;
> > +
> > +	ret = igt_debugfs_simple_read(debugfs_fd, "i915_edp_psr_status", buf,
> > +				      sizeof(buf));
> > +	if (ret < 0)
> > +		return;
> > +
> > +	igt_debug("%s", buf);
> 
> Does the buf always have a newline here? Even when the file has
> exactly PSR_STATUS_MAX_LEN bytes?

i915_edp_psr_status is always smaller than PSR_STATUS_MAX_LEN otherwise it would break tests and it ends with "\n" but I can add it too.

> 
> 
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