linux-kernel - Re: [PATCH] drm: bridge: synopsys/dw-hdmi: Provide default configuration function for HDMI 2.0 PHY

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Date:   Tue, 20 Jun 2017 16:17:20 +0200
From:   Heiko Stübner <heiko@...ech.de>
To:     dri-devel@...ts.freedesktop.org
Cc:     Jose Abreu <Jose.Abreu@...opsys.com>,
        Mark Yao <mark.yao@...k-chips.com>,
        Laurent Pinchart <laurent.pinchart+renesas@...asonboard.com>,
        linux-kernel@...r.kernel.org,
        Carlos Palminha <CARLOS.PALMINHA@...opsys.com>,
        Kieran Bingham <kieran.bingham+renesas@...asonboard.com>
Subject: Re: [PATCH] drm: bridge: synopsys/dw-hdmi: Provide default configuration function for HDMI 2.0 PHY

Hi Jose,

Am Freitag, 9. Juni 2017, 13:53:12 CEST schrieb Jose Abreu:
> On 09-06-2017 12:04, Jose Abreu wrote:
> > Currently HDMI 2.0 PHYs do not have a default configuration function.
> > 
> > As these PHYs have the same register layout as the 3D PHYs we can
> > safely use the default configuration function.
> 
> I may have been a little to fast arriving at this conclusion. I
> mean most of the registers match but in the configuration
> function there are registers that do not match. Did you actually
> test this configuration function with an HDMI 2.0 phy? And did
> you test with different video modes? From my experience the phy
> may be wrongly configured and sometimes work anyway.
> 
> Do please retest with as many video modes as you can and give me
> your phy ID (read from controller config reg HDMI_CONFIG2_ID).

while I'm not Mark and haven't got a working display chain in my test
setup yet, I can at least provide the requested phy-id. The value in 
CONFIG2_ID is 0xf3 on the rk3399 (same on rk3368), which of course
resolves to DW_HDMI_PHY_DWC_HDMI20_TX_PHY.

Heiko

> >  If, for some reason,
> > 
> > the PHY is custom this change will not make any impact because
> > in configuration function we prefer the pdata provided configuration
> > function over the internal one.
> > 
> > This patch is based on today's drm-misc-next branch.
> > 
> > Signed-off-by: Jose Abreu <joabreu@...opsys.com>
> > Cc: Kieran Bingham <kieran.bingham+renesas@...asonboard.com>
> > Cc: Laurent Pinchart <laurent.pinchart+renesas@...asonboard.com>
> > Cc: Archit Taneja <architt@...eaurora.org>
> > Cc: Andrzej Hajda <a.hajda@...sung.com>
> > Cc: Mark Yao <mark.yao@...k-chips.com>
> > Cc: Carlos Palminha <palminha@...opsys.com>
> > ---
> > 
> >  drivers/gpu/drm/bridge/synopsys/dw-hdmi.c | 1 +
> >  1 file changed, 1 insertion(+)
> > 
> > diff --git a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
> > b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c index ead1124..10c8d8c 100644
> > --- a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
> > +++ b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
> > @@ -2170,6 +2170,7 @@ static irqreturn_t dw_hdmi_irq(int irq, void
> > *dev_id)
> > 
> >  		.name = "DWC HDMI 2.0 TX PHY",
> >  		.gen = 2,
> >  		.has_svsret = true,
> > 
> > +		.configure = hdmi_phy_configure_dwc_hdmi_3d_tx,
> > 
> >  	}, {
> >  	
> >  		.type = DW_HDMI_PHY_VENDOR_PHY,
> >  		.name = "Vendor PHY",
> 
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> dri-devel@...ts.freedesktop.org
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