From: "Ville Syrjälä" <ville.syrjala@linux.intel.com>
To: Lyude Paul <lyude@redhat.com>
Cc: intel-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org,
Thomas Zimmermann <tzimmermann@suse.de>,
David Airlie <airlied@linux.ie>,
open list <linux-kernel@vger.kernel.org>,
Maxime Ripard <mripard@kernel.org>
Subject: Re: [Intel-gfx] [PATCH 2/2] drm/dp: Drop open-coded drm_dp_is_branch() in drm_dp_read_downstream_info()
Date: Mon, 3 May 2021 06:06:29 +0300 [thread overview]
Message-ID: <YI9otSh/ftvLqMxb@intel.com> (raw)
In-Reply-To: <20210430223428.10514-2-lyude@redhat.com>
On Fri, Apr 30, 2021 at 06:34:28PM -0400, Lyude Paul wrote:
> Noticed this while fixing another issue in drm_dp_read_downstream_info(),
> the open coded DP_DOWNSTREAMPORT_PRESENT check here just duplicates what we
> already do in drm_dp_is_branch(), so just get rid of it.
>
> Signed-off-by: Lyude Paul <lyude@redhat.com>
> ---
> drivers/gpu/drm/drm_dp_helper.c | 4 +---
> 1 file changed, 1 insertion(+), 3 deletions(-)
>
> diff --git a/drivers/gpu/drm/drm_dp_helper.c b/drivers/gpu/drm/drm_dp_helper.c
> index 27c8c5bdf7d9..0f84df8798ab 100644
> --- a/drivers/gpu/drm/drm_dp_helper.c
> +++ b/drivers/gpu/drm/drm_dp_helper.c
> @@ -677,9 +677,7 @@ int drm_dp_read_downstream_info(struct drm_dp_aux *aux,
> memset(downstream_ports, 0, DP_MAX_DOWNSTREAM_PORTS);
>
> /* No downstream info to read */
> - if (!drm_dp_is_branch(dpcd) ||
> - dpcd[DP_DPCD_REV] < DP_DPCD_REV_10 ||
> - !(dpcd[DP_DOWNSTREAMPORT_PRESENT] & DP_DWN_STRM_PORT_PRESENT))
> + if (!drm_dp_is_branch(dpcd) || dpcd[DP_DPCD_REV] < DP_DPCD_REV_10)
BTW that DPCD_REV check looks rather wrong.
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
> return 0;
>
> /* Some branches advertise having 0 downstream ports, despite also advertising they have a
> --
> 2.30.2
>
> _______________________________________________
> Intel-gfx mailing list
> Intel-gfx@lists.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/intel-gfx
--
Ville Syrjälä
Intel
next prev parent reply other threads:[~2021-05-03 3:06 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-04-30 22:34 [PATCH 1/2] drm/dp: Handle zeroed port counts in drm_dp_read_downstream_info() Lyude Paul
2021-04-30 22:34 ` [PATCH 2/2] drm/dp: Drop open-coded drm_dp_is_branch() " Lyude Paul
2021-05-03 3:06 ` Ville Syrjälä [this message]
2021-05-07 21:28 ` [Intel-gfx] " Lyude Paul
2021-05-03 3:13 ` [PATCH 1/2] drm/dp: Handle zeroed port counts " Ville Syrjälä
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