[Intel-gfx] [PATCH] drm/i915/psr: Add psr sink error status into sink status debugfs

[Hogander, Jouni]

On Tue, 2023-09-05 at 08:52 +0000, Manna, Animesh wrote:
> 
> 
> > -----Original Message-----
> > From: Intel-gfx <intel-gfx-bounces at lists.freedesktop.org> On Behalf
> > Of Jouni
> > Högander
> > Sent: Monday, August 28, 2023 2:01 PM
> > To: intel-gfx at lists.freedesktop.org
> > Subject: [Intel-gfx] [PATCH] drm/i915/psr: Add psr sink error
> > status into sink
> > status debugfs
> > 
> > Normally PSR errors detected by the panel are triggering HPD
> > interrupt and
> > seen as error in dmesg. Some panels are not triggering the
> > interrupt even it is
> > requested and they are detecting error. Due to this it would be
> > good to have
> > possibility to check panel detected errors. Add PSR error status
> > into PSR sink
> > status debugfs interface.
> > 
> > Signed-off-by: Jouni Högander <jouni.hogander at intel.com>
> 
> LGTM.
> Reviewed-by: Animesh Manna <animesh.manna at intel.com>

Thank you Animesh for the review. This is now merged.

BR,

Jouni Högander

> 
> > ---
> >  drivers/gpu/drm/i915/display/intel_psr.c | 34 +++++++++++++++++---
> > ----
> >  1 file changed, 25 insertions(+), 9 deletions(-)
> > 
> > diff --git a/drivers/gpu/drm/i915/display/intel_psr.c
> > b/drivers/gpu/drm/i915/display/intel_psr.c
> > index 72887c29fb51..a008918b4d71 100644
> > --- a/drivers/gpu/drm/i915/display/intel_psr.c
> > +++ b/drivers/gpu/drm/i915/display/intel_psr.c
> > @@ -23,6 +23,7 @@
> > 
> >  #include <drm/drm_atomic_helper.h>
> >  #include <drm/drm_damage_helper.h>
> > +#include <drm/drm_debugfs.h>
> > 
> >  #include "i915_drv.h"
> >  #include "i915_reg.h"
> > @@ -3153,7 +3154,7 @@ static int i915_psr_sink_status_show(struct
> > seq_file
> > *m, void *data)
> >         };
> >         const char *str;
> >         int ret;
> > -       u8 val;
> > +       u8 status, error_status;
> > 
> >         if (!CAN_PSR(intel_dp)) {
> >                 seq_puts(m, "PSR Unsupported\n");
> > @@ -3163,19 +3164,34 @@ static int i915_psr_sink_status_show(struct
> > seq_file *m, void *data)
> >         if (connector->base.status != connector_status_connected)
> >                 return -ENODEV;
> > 
> > -       ret = drm_dp_dpcd_readb(&intel_dp->aux, DP_PSR_STATUS,
> > &val);
> > -       if (ret != 1)
> > -               return ret < 0 ? ret : -EIO;
> > +       ret = psr_get_status_and_error_status(intel_dp, &status,
> > &error_status);
> > +       if (ret)
> > +               return ret;
> > 
> > -       val &= DP_PSR_SINK_STATE_MASK;
> > -       if (val < ARRAY_SIZE(sink_status))
> > -               str = sink_status[val];
> > +       status &= DP_PSR_SINK_STATE_MASK;
> > +       if (status < ARRAY_SIZE(sink_status))
> > +               str = sink_status[status];
> >         else
> >                 str = "unknown";
> > 
> > -       seq_printf(m, "Sink PSR status: 0x%x [%s]\n", val, str);
> > +       seq_printf(m, "Sink PSR status: 0x%x [%s]\n", status, str);
> > 
> > -       return 0;
> > +       seq_printf(m, "Sink PSR error status: 0x%x", error_status);
> > +
> > +       if (error_status & (DP_PSR_RFB_STORAGE_ERROR |
> > +                           DP_PSR_VSC_SDP_UNCORRECTABLE_ERROR |
> > +                           DP_PSR_LINK_CRC_ERROR))
> > +               seq_puts(m, ":\n");
> > +       else
> > +               seq_puts(m, "\n");
> > +       if (error_status & DP_PSR_RFB_STORAGE_ERROR)
> > +               seq_puts(m, "\tPSR RFB storage error\n");
> > +       if (error_status & DP_PSR_VSC_SDP_UNCORRECTABLE_ERROR)
> > +               seq_puts(m, "\tPSR VSC SDP uncorrectable error\n");
> > +       if (error_status & DP_PSR_LINK_CRC_ERROR)
> > +               seq_puts(m, "\tPSR Link CRC error\n");
> > +
> > +       return ret;
> >  }
> >  DEFINE_SHOW_ATTRIBUTE(i915_psr_sink_status);
> > 
> > --
> > 2.34.1
>