On 08/09/2015 12:04 AM, Russell King wrote:
> dw_hdmi_phy_enable_power() is not about enabling and disabling power.
> It is about allowing or preventing power-down mode being entered - the
> register is documented as "Power-down enable (active low 0b)."

Same as rockchip hdmi document, great clean, wish I have the
qualification to share review. (If no, that's fine :) )
Reviewed-by: Yakir Yang <ykk@rock-chips.com>

- Yakir
> This can be seen as the bit has no effect when the HDMI phy is
> operational on iMX6 hardware.
>
> Rename the function to dw_hdmi_phy_enable_powerdown() to reflect the
> documentation, make it take a bool for the 'enable' argument, and invert
> the value to be written.
>
> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
> ---
>   drivers/gpu/drm/bridge/dw_hdmi.c | 10 +++++-----
>   1 file changed, 5 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/gpu/drm/bridge/dw_hdmi.c b/drivers/gpu/drm/bridge/dw_hdmi.c
> index fbac8386552b..7b8a4e942a71 100644
> --- a/drivers/gpu/drm/bridge/dw_hdmi.c
> +++ b/drivers/gpu/drm/bridge/dw_hdmi.c
> @@ -737,9 +737,9 @@ static int hdmi_phy_i2c_write(struct dw_hdmi *hdmi, unsigned short data,
>   	return 0;
>   }
>   
> -static void dw_hdmi_phy_enable_power(struct dw_hdmi *hdmi, u8 enable)
> +static void dw_hdmi_phy_enable_powerdown(struct dw_hdmi *hdmi, bool enable)
>   {
> -	hdmi_mask_writeb(hdmi, enable, HDMI_PHY_CONF0,
> +	hdmi_mask_writeb(hdmi, !enable, HDMI_PHY_CONF0,
>   			 HDMI_PHY_CONF0_PDZ_OFFSET,
>   			 HDMI_PHY_CONF0_PDZ_MASK);
>   }
> @@ -879,7 +879,7 @@ static int hdmi_phy_configure(struct dw_hdmi *hdmi, unsigned char prep,
>   	/* REMOVE CLK TERM */
>   	hdmi_phy_i2c_write(hdmi, 0x8000, 0x05);  /* CKCALCTRL */
>   
> -	dw_hdmi_phy_enable_power(hdmi, 1);
> +	dw_hdmi_phy_enable_powerdown(hdmi, false);
>   
>   	/* toggle TMDS enable */
>   	dw_hdmi_phy_enable_tmds(hdmi, 0);
> @@ -924,7 +924,7 @@ static int dw_hdmi_phy_init(struct dw_hdmi *hdmi)
>   		dw_hdmi_phy_sel_data_en_pol(hdmi, 1);
>   		dw_hdmi_phy_sel_interface_control(hdmi, 0);
>   		dw_hdmi_phy_enable_tmds(hdmi, 0);
> -		dw_hdmi_phy_enable_power(hdmi, 0);
> +		dw_hdmi_phy_enable_powerdown(hdmi, true);
>   
>   		/* Enable CSC */
>   		ret = hdmi_phy_configure(hdmi, 0, 8, cscon);
> @@ -1155,7 +1155,7 @@ static void dw_hdmi_phy_disable(struct dw_hdmi *hdmi)
>   		return;
>   
>   	dw_hdmi_phy_enable_tmds(hdmi, 0);
> -	dw_hdmi_phy_enable_power(hdmi, 0);
> +	dw_hdmi_phy_enable_powerdown(hdmi, true);
>   
>   	hdmi->phy_enabled = false;
>   }