On Tue, Oct 29, 2019 at 03:32:41PM +0200, Jani Nikula wrote:
> On Tue, 29 Oct 2019, Thierry Reding <thierry.reding@xxxxxxxxx> wrote:
> > From: Thierry Reding <treding@xxxxxxxxxx>
> >
> > The current link status contains bytes 0x202 through 0x207, but we also
> > want to make sure to include the DP_ADJUST_REQUEST_POST_CURSOR2 (0x20c)
> > so that the post-cursor adjustment can be queried during link training.
>
> We don't currently use this in i915 (we probably should)
IIRC post cursor2 is already deprecated.
> , so the impact
> here is that we'll just read more DPCD than before. I quickly perused
> i915, and this does not appear to directly break anything. I think the
> change is probably fine, but at the same time it freaks me out a bit...
>
> If you don't mind, please resend this with Cc:
> intel-gfx@xxxxxxxxxxxxxxxxxxxxx to have our CI crunch through it across
> a number of platforms. Would give me a warm fuzzy feeling. :)
>
> With the caveat that I didn't look at any other drivers besides i915,
>
> Reviewed-by: Jani Nikula <jani.nikula@xxxxxxxxx>
>
>
> >
> > Reported-by: coverity-bot <keescook+coverity-bot@xxxxxxxxxxxx>
> > Addresses-Coverity-ID: 1487366 ("Memory - corruptions")
> > Fixes: 79465e0ffeb9 ("drm/dp: Add helper to get post-cursor adjustments")
> > Signed-off-by: Thierry Reding <treding@xxxxxxxxxx>
> > ---
> > I vaguely recall once carrying a patch to do this, but I can't find any
> > trace of it.
> >
> > include/drm/drm_dp_helper.h | 2 +-
> > 1 file changed, 1 insertion(+), 1 deletion(-)
> >
> > diff --git a/include/drm/drm_dp_helper.h b/include/drm/drm_dp_helper.h
> > index 51ecb5112ef8..9581dec900ba 100644
> > --- a/include/drm/drm_dp_helper.h
> > +++ b/include/drm/drm_dp_helper.h
> > @@ -1121,7 +1121,7 @@
> > #define DP_MST_PHYSICAL_PORT_0 0
> > #define DP_MST_LOGICAL_PORT_0 8
> >
> > -#define DP_LINK_STATUS_SIZE 6
> > +#define DP_LINK_STATUS_SIZE 11
> > bool drm_dp_channel_eq_ok(const u8 link_status[DP_LINK_STATUS_SIZE],
> > int lane_count);
> > bool drm_dp_clock_recovery_ok(const u8 link_status[DP_LINK_STATUS_SIZE],
>
> --
> Jani Nikula, Intel Open Source Graphics Center
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--
Ville Syrjälä
Intel
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