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

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Date:   Sun, 10 Apr 2022 12:14:17 +0200
From:   Jernej Škrabec <jernej.skrabec@...il.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, hverkuil-cisco@...all.nl,
        Neil Armstrong <narmstrong@...libre.com>
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

Dne petek, 08. april 2022 ob 14:22:52 CEST je Neil Armstrong napisal(a):
> 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>

Acked-by: Jernej Skrabec <jernej.skrabec@...il.com>

Best regards,
Jernej

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