linux-kernel - Re: [PATCH v2 4/5] drm: bridge: dw_hdmi: add reset function for PHY GEN1

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Date:   Fri, 8 Apr 2022 14:22:52 +0200
From:   Neil Armstrong <narmstrong@...libre.com>
To:     Sandor Yu <Sandor.yu@....com>, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org, andrzej.hajda@...el.com,
        robert.foss@...aro.org, Laurent.pinchart@...asonboard.com,
        jonas@...boo.se, jernej.skrabec@...il.com, hverkuil-cisco@...all.nl
Cc:     shengjiu.wang@....com, cai.huoqing@...ux.dev, maxime@...no.tech,
        harry.wentland@....com
Subject: Re: [PATCH v2 4/5] drm: bridge: dw_hdmi: add reset function for PHY
 GEN1

On 08/04/2022 12:32, Sandor Yu wrote:
> PHY reset register(MC_PHYRSTZ) active high reset control for PHY GEN2,
> and active low reset control for PHY GEN1.
> 
> Rename function dw_hdmi_phy_reset to dw_hdmi_phy_gen2_reset.
> Add dw_hdmi_phy_gen1_reset function for PHY GEN1.
> 
> Signed-off-by: Sandor Yu <Sandor.yu@....com>
> ---
>   drivers/gpu/drm/bridge/synopsys/dw-hdmi.c | 14 +++++++++++---
>   drivers/gpu/drm/sun4i/sun8i_hdmi_phy.c    |  2 +-
>   include/drm/bridge/dw_hdmi.h              |  4 +++-
>   3 files changed, 15 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
> index 5a7ec066e37a..13270d96e5be 100644
> --- a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
> +++ b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
> @@ -1369,13 +1369,21 @@ static void dw_hdmi_phy_sel_interface_control(struct dw_hdmi *hdmi, u8 enable)
>   			 HDMI_PHY_CONF0_SELDIPIF_MASK);
>   }
>   
> -void dw_hdmi_phy_reset(struct dw_hdmi *hdmi)
> +void dw_hdmi_phy_gen1_reset(struct dw_hdmi *hdmi)
> +{
> +	/* PHY reset. The reset signal is active low on Gen1 PHYs. */
> +	hdmi_writeb(hdmi, 0, HDMI_MC_PHYRSTZ);
> +	hdmi_writeb(hdmi, HDMI_MC_PHYRSTZ_PHYRSTZ, HDMI_MC_PHYRSTZ);
> +}
> +EXPORT_SYMBOL_GPL(dw_hdmi_phy_gen1_reset);
> +
> +void dw_hdmi_phy_gen2_reset(struct dw_hdmi *hdmi)
>   {
>   	/* PHY reset. The reset signal is active high on Gen2 PHYs. */
>   	hdmi_writeb(hdmi, HDMI_MC_PHYRSTZ_PHYRSTZ, HDMI_MC_PHYRSTZ);
>   	hdmi_writeb(hdmi, 0, HDMI_MC_PHYRSTZ);
>   }
> -EXPORT_SYMBOL_GPL(dw_hdmi_phy_reset);
> +EXPORT_SYMBOL_GPL(dw_hdmi_phy_gen2_reset);
>   
>   void dw_hdmi_phy_i2c_set_addr(struct dw_hdmi *hdmi, u8 address)
>   {
> @@ -1529,7 +1537,7 @@ static int hdmi_phy_configure(struct dw_hdmi *hdmi,
>   	if (phy->has_svsret)
>   		dw_hdmi_phy_enable_svsret(hdmi, 1);
>   
> -	dw_hdmi_phy_reset(hdmi);
> +	dw_hdmi_phy_gen2_reset(hdmi);
>   
>   	hdmi_writeb(hdmi, HDMI_MC_HEACPHY_RST_ASSERT, HDMI_MC_HEACPHY_RST);
>   
> diff --git a/drivers/gpu/drm/sun4i/sun8i_hdmi_phy.c b/drivers/gpu/drm/sun4i/sun8i_hdmi_phy.c
> index 5e2b0175df36..2860e6bff8b7 100644
> --- a/drivers/gpu/drm/sun4i/sun8i_hdmi_phy.c
> +++ b/drivers/gpu/drm/sun4i/sun8i_hdmi_phy.c
> @@ -135,7 +135,7 @@ static int sun8i_hdmi_phy_config_a83t(struct dw_hdmi *hdmi,
>   	dw_hdmi_phy_gen2_txpwron(hdmi, 0);
>   	dw_hdmi_phy_gen2_pddq(hdmi, 1);
>   
> -	dw_hdmi_phy_reset(hdmi);
> +	dw_hdmi_phy_gen2_reset(hdmi);
>   
>   	dw_hdmi_phy_gen2_pddq(hdmi, 0);
>   
> diff --git a/include/drm/bridge/dw_hdmi.h b/include/drm/bridge/dw_hdmi.h
> index 2a1f85f9a8a3..70082f80a8c8 100644
> --- a/include/drm/bridge/dw_hdmi.h
> +++ b/include/drm/bridge/dw_hdmi.h
> @@ -187,9 +187,11 @@ void dw_hdmi_phy_i2c_set_addr(struct dw_hdmi *hdmi, u8 address);
>   void dw_hdmi_phy_i2c_write(struct dw_hdmi *hdmi, unsigned short data,
>   			   unsigned char addr);
>   
> +void dw_hdmi_phy_gen1_reset(struct dw_hdmi *hdmi);
> +
>   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_gen2_reset(struct dw_hdmi *hdmi);
>   
>   enum drm_connector_status dw_hdmi_phy_read_hpd(struct dw_hdmi *hdmi,
>   					       void *data);

Reviewed-by: Neil Armstrong <narmstrong@...libre.com>

If a sun4i drm maintainer can ack, then it would be all good to apply.

Neil