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drm/bridge: tc358768: always enable HS video mode

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[ 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: ff1ca6397b ("drm/bridge: Add tc358768 driver")
Signed-off-by: Francesco Dolcini <francesco.dolcini@toradex.com>
Reviewed-by: Robert Foss <rfoss@kernel.org>
Signed-off-by: Robert Foss <rfoss@kernel.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20230427142934.55435-2-francesco@dolcini.it
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Francesco Dolcini 2023-04-27 16:29:26 +02:00 committed by Greg Kroah-Hartman
parent 63f3bc83b1
commit c4cf126320
1 changed files with 1 additions and 2 deletions
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3
drivers/gpu/drm/bridge/tc358768.c
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@ -867,8 +867,7 @@ 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 (!(mode_flags & MIPI_DSI_CLOCK_NON_CONTINUOUS))
val |= TC358768_DSI_CONTROL_HSCKMD;