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drm/bridge: lt9611: fix HPD reenablement

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The driver will reset the bridge in the atomic_pre_enable(). However
this will also drop the HPD interrupt state. Instead of resetting the
bridge, properly wake it up. This fixes the HPD interrupt delivery after
the disable/enable cycle.

Fixes: 23278bf54a ("drm/bridge: Introduce LT9611 DSI to HDMI bridge")
Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org>
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20230118081658.2198520-3-dmitry.baryshkov@linaro.org
This commit is contained in:
Dmitry Baryshkov 2023-01-18 10:16:47 +02:00 committed by Neil Armstrong
parent ae2d329f10
commit a7790f6bd3
1 changed files with 8 additions and 2 deletions
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10
drivers/gpu/drm/bridge/lontium-lt9611.c
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@ -857,12 +857,18 @@ static enum drm_mode_status lt9611_bridge_mode_valid(struct drm_bridge *bridge,
static void lt9611_bridge_pre_enable(struct drm_bridge *bridge)
{
struct lt9611 *lt9611 = bridge_to_lt9611(bridge);
static const struct reg_sequence reg_cfg[] = {
{ 0x8102, 0x12 },
{ 0x8123, 0x40 },
{ 0x8130, 0xea },
{ 0x8011, 0xfa },
};
if (!lt9611->sleep)
return;
lt9611_reset(lt9611);
regmap_write(lt9611->regmap, 0x80ee, 0x01);
regmap_multi_reg_write(lt9611->regmap,
reg_cfg, ARRAY_SIZE(reg_cfg));
lt9611->sleep = false;
}