[PATCH v2 02/13] drm/bridge: lt9611: fix HPD reenablement

[Neil Armstrong]

On 08/01/2023 17:56, Dmitry Baryshkov wrote:
> 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: 23278bf54afe ("drm/bridge: Introduce LT9611 DSI to HDMI bridge")
> Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov at linaro.org>
> ---
>   drivers/gpu/drm/bridge/lontium-lt9611.c | 10 ++++++++--
>   1 file changed, 8 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/gpu/drm/bridge/lontium-lt9611.c b/drivers/gpu/drm/bridge/lontium-lt9611.c
> index 2714184cc53f..58f39b279217 100644
> --- a/drivers/gpu/drm/bridge/lontium-lt9611.c
> +++ b/drivers/gpu/drm/bridge/lontium-lt9611.c
> @@ -856,12 +856,18 @@ 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;
>   }

Reviewed-by: Neil Armstrong <neil.armstrong at linaro.org>