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Date: Sun, 28 Jun 2026 19:00:41 +0200
From: Andreas Kemnade <andreas@kemnade.info>
To: Ivaylo Dimitrov <ivo.g.dimitrov.75@gmail.com>
Cc: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>, Maarten Lankhorst
 <maarten.lankhorst@linux.intel.com>, Maxime Ripard <mripard@kernel.org>,
 Thomas Zimmermann <tzimmermann@suse.de>, David Airlie <airlied@gmail.com>,
 Simona Vetter <simona@ffwll.ch>, Sebastian Reichel
 <sebastian.reichel@collabora.com>, Laurent Pinchart
 <laurent.pinchart@ideasonboard.com>, Tony Lindgren <tony@atomide.com>,
 Linux-OMAP <linux-omap@vger.kernel.org>, Marek Vasut <marex@denx.de>, "H.
 Nikolaus Schaller" <hns@goldelico.com>, dri-devel@lists.freedesktop.org,
 linux-kernel@vger.kernel.org, Tomi Valkeinen <tomi.valkeinen@ti.com>
Subject: Re: [PATCH] drm/omap: dsi: avoid sending bta sync all the time in
 writes
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On Fri, 29 May 2026 09:26:23 +0300
Ivaylo Dimitrov <ivo.g.dimitrov.75@gmail.com> wrote:

> Hi,
> 
> with the following changes:
> 
> user@devuan:/media/user/7b76ddc8-44f5-47b5-af5b-e5e9b5ab39c3/user/linux_openpvrsgx$ 
> git diff drivers/gpu/drm/omapdrm/dss/dsi.c
> diff --git a/drivers/gpu/drm/omapdrm/dss/dsi.c 
> b/drivers/gpu/drm/omapdrm/dss/dsi.c
> index af27339c79f9..8ffcd95c3bc3 100644
> --- a/drivers/gpu/drm/omapdrm/dss/dsi.c
> +++ b/drivers/gpu/drm/omapdrm/dss/dsi.c
> @@ -2199,7 +2199,7 @@ static int dsi_vc_write_common(struct 
> omap_dss_device *dssdev, int vc,
>          int r;
> 
>          if (mipi_dsi_packet_format_is_short(msg->type))
> -               r = dsi_vc_send_short(dsi, vc, msg);
> +               return dsi_vc_send_short(dsi, vc, msg);
>          else
>                  r = dsi_vc_send_long(dsi, vc, msg);
> 
> @@ -3247,21 +3247,6 @@ static int _dsi_update(struct dsi_data *dsi)

do you really need the change from above?
I think it should not be needed with the other changes.
Waiting on short packets seems to work here.

Regards,
Andreas