[PATCH v3] drm/bridge: dw-hdmi: Restore audio when setting a mode

[Neil Armstrong]

On 08/10/2019 12:21, Cheng-Yi Chiang wrote:
> From: Daniel Kurtz <djkurtz at chromium.org>
> 
> When setting a new display mode, dw_hdmi_setup() calls
> dw_hdmi_enable_video_path(), which disables all hdmi clocks, including
> the audio clock.
> 
> We should only (re-)enable the audio clock if audio was already enabled
> when setting the new mode.
> 
> Without this patch, on RK3288, there will be HDMI audio on some monitors
> if i2s was played to headphone when the monitor was plugged.
> ACER H277HU and ASUS PB278 are two of the monitors showing this issue.
> 
> Signed-off-by: Cheng-Yi Chiang <cychiang at chromium.org>
> Signed-off-by: Daniel Kurtz <djkurtz at chromium.org>
> Signed-off-by: Yakir Yang <ykk at rock-chips.com>
> ---
>  Change from v2 to v3:
>  - Remove spinlock around setting clock.
> 
>  drivers/gpu/drm/bridge/synopsys/dw-hdmi.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
> index a15fbf71b9d7..af060162b0af 100644
> --- a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
> +++ b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
> @@ -2054,7 +2054,7 @@ static int dw_hdmi_setup(struct dw_hdmi *hdmi, struct drm_display_mode *mode)
>  
>  		/* HDMI Initialization Step E - Configure audio */
>  		hdmi_clk_regenerator_update_pixel_clock(hdmi);
> -		hdmi_enable_audio_clk(hdmi, true);
> +		hdmi_enable_audio_clk(hdmi, hdmi->audio_enable);
>  	}
>  
>  	/* not for DVI mode */
> 

Looks coherent for me.

Reviewed-by: Neil Armstrong <narmstrong at baylibre.com>

Applying to drm-misc-next