linux-kernel - [RFC PATCH 02/10] drm/mipi-dsi: document DSI hosts limitations

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Date:   Mon, 16 Oct 2023 19:53:47 +0300
From:   Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To:     Dave Stevenson <dave.stevenson@...pberrypi.com>,
        Andrzej Hajda <andrzej.hajda@...el.com>,
        Neil Armstrong <neil.armstrong@...aro.org>,
        Robert Foss <rfoss@...nel.org>,
        Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
        Jonas Karlman <jonas@...boo.se>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>,
        Douglas Anderson <dianders@...omium.org>,
        Rob Clark <robdclark@...il.com>,
        Abhinav Kumar <quic_abhinavk@...cinc.com>,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        Sean Paul <sean@...rly.run>,
        Marijn Suijten <marijn.suijten@...ainline.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Jessica Zhang <quic_jesszhan@...cinc.com>
Cc:     Marek Vasut <marex@...x.de>, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        freedreno@...ts.freedesktop.org
Subject: [RFC PATCH 02/10] drm/mipi-dsi: document DSI hosts limitations

Document the known limititations of the DSI hosts vs commands transfers
in LP mode. For the details see sun6i_dsi_encoder_enable().

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
---
 include/drm/drm_mipi_dsi.h | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/include/drm/drm_mipi_dsi.h b/include/drm/drm_mipi_dsi.h
index c9df0407980c..167742e579e3 100644
--- a/include/drm/drm_mipi_dsi.h
+++ b/include/drm/drm_mipi_dsi.h
@@ -85,6 +85,10 @@ int mipi_dsi_create_packet(struct mipi_dsi_packet *packet,
  * host is in. Drivers that need the underlying device to be powered to
  * perform these operations will first need to make sure it's been
  * properly enabled.
+ *
+ * Note: some hosts (sunxi) can not send LP commands between HS video
+ * packets. Thus all DSI transfers sent in LP mode should be limited to the
+ * drm_bridge_funcs::pre_enable() and drm_panel_funcs::prepare() callbacks.
  */
 struct mipi_dsi_host_ops {
 	int (*attach)(struct mipi_dsi_host *host,
-- 
2.42.0