linux-kernel - Re: [PATCH 1/2] drm/sun4i: tcon: fix inverted DCLK polarity

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Date:   Wed, 06 Jan 2021 22:00:04 +0100
From:   Jernej Škrabec <jernej.skrabec@...l.net>
To:     Maxime Ripard <maxime@...no.tech>,
        Giulio Benetti <giulio.benetti@...ronovasrl.com>
Cc:     Marjan Pascolo <marjan.pascolo@...xom.it>, wens@...e.org,
        daniel@...ll.ch, airlied@...ux.ie, treding@...dia.com,
        dri-devel@...ts.freedesktop.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Giulio Benetti <giulio.benetti@...ronovasrl.com>
Subject: Re: [PATCH 1/2] drm/sun4i: tcon: fix inverted DCLK polarity

Dne sreda, 06. januar 2021 ob 20:27:59 CET je Giulio Benetti napisal(a):
> During commit "88bc4178568b8e0331143cc0616640ab72f0cba1" DRM_BUS_FLAG_*

Please use same commit referencing approach as for "Fixes" tag.

> macros have been changed to avoid ambiguity but just because of this
> ambiguity previous DRM_BUS_FLAG_PIXDATA_(POS/NEG)EDGE were used meaning
> _SAMPLE_ not _DRIVE_. This lead to DLCK inversion, so let's swap DCLK
> phase to fix it.
> 

Add Fixes tag here.

Best regards,
Jernej

> Signed-off-by: Giulio Benetti <giulio.benetti@...ronovasrl.com>
> ---
>  drivers/gpu/drm/sun4i/sun4i_tcon.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/gpu/drm/sun4i/sun4i_tcon.c b/drivers/gpu/drm/sun4i/
sun4i_tcon.c
> index eaaf5d70e352..52598bb0fb0b 100644
> --- a/drivers/gpu/drm/sun4i/sun4i_tcon.c
> +++ b/drivers/gpu/drm/sun4i/sun4i_tcon.c
> @@ -585,10 +585,10 @@ static void sun4i_tcon0_mode_set_rgb(struct sun4i_tcon 
*tcon,
>  	 * and DOTCLOCK drivers.
>  	 */
>  	if (info->bus_flags & DRM_BUS_FLAG_PIXDATA_DRIVE_POSEDGE)
> -		clk_set_phase(tcon->dclk, 240);
> +		clk_set_phase(tcon->dclk, 0);
>  
>  	if (info->bus_flags & DRM_BUS_FLAG_PIXDATA_DRIVE_NEGEDGE)
> -		clk_set_phase(tcon->dclk, 0);
> +		clk_set_phase(tcon->dclk, 240);
>  
>  	regmap_update_bits(tcon->regs, SUN4I_TCON0_IO_POL_REG,
>  			   SUN4I_TCON0_IO_POL_HSYNC_POSITIVE |
> -- 
> 2.25.1
> 
>