From: Daniel Kurtz djkurtz@chromium.org
[ Upstream commit fadfee3f9d8f114435a8a3e9f83a227600d89de7 ]
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@chromium.org Signed-off-by: Daniel Kurtz djkurtz@chromium.org Signed-off-by: Yakir Yang ykk@rock-chips.com Reviewed-by: Neil Armstrong narmstrong@baylibre.com Signed-off-by: Neil Armstrong narmstrong@baylibre.com Link: https://patchwork.freedesktop.org/patch/msgid/20191008102145.55134-1-cychian... Signed-off-by: Sasha Levin sashal@kernel.org --- 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 0febaafb8d89..cc1094f90125 100644 --- a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c +++ b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c @@ -1743,7 +1743,7 @@ 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 */