On 30/05/17 16:23, Russell King wrote:
> The video setup path aways sets the clock disable register to a specific
> value, which has the effect of disabling the CEC engine. When we add the
> CEC driver, this becomes a problem.
>
> Fix this by only setting/clearing the bits that the video path needs to.
>
> Signed-off-by: Russell King <rmk+kernel@xxxxxxxxxxxxxxx>
For what it is worth:
Acked-by: Hans Verkuil <hans.verkuil@xxxxxxxxx>
Regards,
Hans
> ---
> drivers/gpu/drm/bridge/synopsys/dw-hdmi.c | 25 +++++++++++++++----------
> 1 file changed, 15 insertions(+), 10 deletions(-)
>
> diff --git a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
> index 966422576c44..58781d4c1034 100644
> --- a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
> +++ b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
> @@ -166,6 +166,7 @@ struct dw_hdmi {
> bool bridge_is_on; /* indicates the bridge is on */
> bool rxsense; /* rxsense state */
> u8 phy_mask; /* desired phy int mask settings */
> + u8 mc_clkdis; /* clock disable register */
>
> spinlock_t audio_lock;
> struct mutex audio_mutex;
> @@ -1543,8 +1544,6 @@ static void hdmi_av_composer(struct dw_hdmi *hdmi,
> /* HDMI Initialization Step B.4 */
> static void dw_hdmi_enable_video_path(struct dw_hdmi *hdmi)
> {
> - u8 clkdis;
> -
> /* control period minimum duration */
> hdmi_writeb(hdmi, 12, HDMI_FC_CTRLDUR);
> hdmi_writeb(hdmi, 32, HDMI_FC_EXCTRLDUR);
> @@ -1556,17 +1555,21 @@ static void dw_hdmi_enable_video_path(struct dw_hdmi *hdmi)
> hdmi_writeb(hdmi, 0x21, HDMI_FC_CH2PREAM);
>
> /* Enable pixel clock and tmds data path */
> - clkdis = 0x7F;
> - clkdis &= ~HDMI_MC_CLKDIS_PIXELCLK_DISABLE;
> - hdmi_writeb(hdmi, clkdis, HDMI_MC_CLKDIS);
> + hdmi->mc_clkdis |= HDMI_MC_CLKDIS_HDCPCLK_DISABLE |
> + HDMI_MC_CLKDIS_CSCCLK_DISABLE |
> + HDMI_MC_CLKDIS_AUDCLK_DISABLE |
> + HDMI_MC_CLKDIS_PREPCLK_DISABLE |
> + HDMI_MC_CLKDIS_TMDSCLK_DISABLE;
> + hdmi->mc_clkdis &= ~HDMI_MC_CLKDIS_PIXELCLK_DISABLE;
> + hdmi_writeb(hdmi, hdmi->mc_clkdis, HDMI_MC_CLKDIS);
>
> - clkdis &= ~HDMI_MC_CLKDIS_TMDSCLK_DISABLE;
> - hdmi_writeb(hdmi, clkdis, HDMI_MC_CLKDIS);
> + hdmi->mc_clkdis &= ~HDMI_MC_CLKDIS_TMDSCLK_DISABLE;
> + hdmi_writeb(hdmi, hdmi->mc_clkdis, HDMI_MC_CLKDIS);
>
> /* Enable csc path */
> if (is_color_space_conversion(hdmi)) {
> - clkdis &= ~HDMI_MC_CLKDIS_CSCCLK_DISABLE;
> - hdmi_writeb(hdmi, clkdis, HDMI_MC_CLKDIS);
> + hdmi->mc_clkdis &= ~HDMI_MC_CLKDIS_CSCCLK_DISABLE;
> + hdmi_writeb(hdmi, hdmi->mc_clkdis, HDMI_MC_CLKDIS);
> }
>
> /* Enable color space conversion if needed */
> @@ -1580,7 +1583,8 @@ static void dw_hdmi_enable_video_path(struct dw_hdmi *hdmi)
>
> static void hdmi_enable_audio_clk(struct dw_hdmi *hdmi)
> {
> - hdmi_modb(hdmi, 0, HDMI_MC_CLKDIS_AUDCLK_DISABLE, HDMI_MC_CLKDIS);
> + hdmi->mc_clkdis &= ~HDMI_MC_CLKDIS_AUDCLK_DISABLE;
> + hdmi_writeb(hdmi, hdmi->mc_clkdis, HDMI_MC_CLKDIS);
> }
>
> /* Workaround to clear the overflow condition */
> @@ -2261,6 +2265,7 @@ __dw_hdmi_probe(struct platform_device *pdev,
> hdmi->disabled = true;
> hdmi->rxsense = true;
> hdmi->phy_mask = (u8)~(HDMI_PHY_HPD | HDMI_PHY_RX_SENSE);
> + hdmi->mc_clkdis = 0x7f;
>
> mutex_init(&hdmi->mutex);
> mutex_init(&hdmi->audio_mutex);
>
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