[PATCH v0 01/10] drm/bridge: dw-hdmi: add low-active PHY reset

[Neil Armstrong]

Hi Lucas,

On 06/04/2022 18:01, Lucas Stach wrote:
> Allow vendor PHY implementations to reset PHYs with different polarity
> than the current Gen2 reset.
> 
> Signed-off-by: Lucas Stach <l.stach at pengutronix.de>
> ---
>   drivers/gpu/drm/bridge/synopsys/dw-hdmi.c | 7 +++++++
>   include/drm/bridge/dw_hdmi.h              | 1 +
>   2 files changed, 8 insertions(+)
> 
> diff --git a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
> index 4befc104d220..7600f26aab27 100644
> --- a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
> +++ b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
> @@ -1365,6 +1365,13 @@ void dw_hdmi_phy_reset(struct dw_hdmi *hdmi)
>   }
>   EXPORT_SYMBOL_GPL(dw_hdmi_phy_reset);
>   
> +void dw_hdmi_phy_reset_active_low(struct dw_hdmi *hdmi)
> +{
> +	hdmi_writeb(hdmi, 0, HDMI_MC_PHYRSTZ);
> +	hdmi_writeb(hdmi, HDMI_MC_PHYRSTZ_PHYRSTZ, HDMI_MC_PHYRSTZ);
> +}
> +EXPORT_SYMBOL_GPL(dw_hdmi_phy_reset_active_low);
> +
>   void dw_hdmi_phy_i2c_set_addr(struct dw_hdmi *hdmi, u8 address)
>   {
>   	hdmi_phy_test_clear(hdmi, 1);
> diff --git a/include/drm/bridge/dw_hdmi.h b/include/drm/bridge/dw_hdmi.h
> index 2a1f85f9a8a3..9b3d52a1e62a 100644
> --- a/include/drm/bridge/dw_hdmi.h
> +++ b/include/drm/bridge/dw_hdmi.h
> @@ -190,6 +190,7 @@ void dw_hdmi_phy_i2c_write(struct dw_hdmi *hdmi, unsigned short data,
>   void dw_hdmi_phy_gen2_pddq(struct dw_hdmi *hdmi, u8 enable);
>   void dw_hdmi_phy_gen2_txpwron(struct dw_hdmi *hdmi, u8 enable);
>   void dw_hdmi_phy_reset(struct dw_hdmi *hdmi);
> +void dw_hdmi_phy_reset_active_low(struct dw_hdmi *hdmi);
>   
>   enum drm_connector_status dw_hdmi_phy_read_hpd(struct dw_hdmi *hdmi,
>   					       void *data);

This has already been submitted at https://lore.kernel.org/r/800262112191a720639ba321be18f0926d4e1d2a.1649230434.git.Sandor.yu@nxp.com