From: Francesco Dolcini francesco.dolcini@toradex.com
[ 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@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-frances... Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/gpu/drm/bridge/tc358768.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/bridge/tc358768.c b/drivers/gpu/drm/bridge/tc358768.c index 7c0cbe84611b9..8f349bf4fc32f 100644 --- a/drivers/gpu/drm/bridge/tc358768.c +++ b/drivers/gpu/drm/bridge/tc358768.c @@ -866,8 +866,7 @@ 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;