Patch "drm/bridge: tc358768: always enable HS video mode" has been added to the 5.15-stable tree

[Sasha Levin <sashal@xxxxxxxxxx>]

This is a note to let you know that I've just added the patch titled

    drm/bridge: tc358768: always enable HS video mode

to the 5.15-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     drm-bridge-tc358768-always-enable-hs-video-mode.patch
and it can be found in the queue-5.15 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit a16777ea53614bfbf91e189979e88eb247825519
Author: Francesco Dolcini <francesco.dolcini@xxxxxxxxxxx>
Date:   Thu Apr 27 16:29:26 2023 +0200

    drm/bridge: tc358768: always enable HS video mode
    
    [ Upstream commit 75a8aeac2573ab258c53676eba9b3796ea691988 ]
    
    Always enable HS video mode setting the TXMD bit, without this change no
    video output is present with DSI sinks that are setting
    MIPI_DSI_MODE_LPM flag (tested with LT8912B DSI-HDMI bridge).
    
    Previously the driver was enabling HS mode only when the DSI sink was
    not explicitly setting the MIPI_DSI_MODE_LPM, however this is not
    correct.
    
    The MIPI_DSI_MODE_LPM is supposed to indicate that the sink is willing
    to receive data in low power mode, however clearing the
    TC358768_DSI_CONTROL_TXMD bit will make the TC358768 send video in
    LP mode that is not the intended behavior.
    
    Fixes: ff1ca6397b1d ("drm/bridge: Add tc358768 driver")
    Signed-off-by: Francesco Dolcini <francesco.dolcini@xxxxxxxxxxx>
    Reviewed-by: Robert Foss <rfoss@xxxxxxxxxx>
    Signed-off-by: Robert Foss <rfoss@xxxxxxxxxx>
    Link: https://patchwork.freedesktop.org/patch/msgid/20230427142934.55435-2-francesco@xxxxxxxxxx
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/drivers/gpu/drm/bridge/tc358768.c b/drivers/gpu/drm/bridge/tc358768.c
index a3db532bbdd16..8de7d9764ba88 100644
--- a/drivers/gpu/drm/bridge/tc358768.c
+++ b/drivers/gpu/drm/bridge/tc358768.c
@@ -819,8 +819,7 @@ static void tc358768_bridge_pre_enable(struct drm_bridge *bridge)
 	val = TC358768_DSI_CONFW_MODE_SET | TC358768_DSI_CONFW_ADDR_DSI_CONTROL;
 	val |= (dsi_dev->lanes - 1) << 1;
 
-	if (!(dsi_dev->mode_flags & MIPI_DSI_MODE_LPM))
-		val |= TC358768_DSI_CONTROL_TXMD;
+	val |= TC358768_DSI_CONTROL_TXMD;
 
 	if (!(dsi_dev->mode_flags & MIPI_DSI_CLOCK_NON_CONTINUOUS))
 		val |= TC358768_DSI_CONTROL_HSCKMD;