linux-kernel - Re: [PATCH] drm/sun4i: Handle DRM_BUS_FLAG_PIXDATA

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Message-ID: <20180301093909.ph6nuvxuqtwyfssd@flea>
Date:   Thu, 1 Mar 2018 10:39:09 +0100
From:   Maxime Ripard <maxime.ripard@...tlin.com>
To:     Giulio Benetti <giulio.benetti@...ronovasrl.com>
Cc:     David Airlie <airlied@...ux.ie>, Chen-Yu Tsai <wens@...e.org>,
        dri-devel@...ts.freedesktop.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] drm/sun4i: Handle DRM_BUS_FLAG_PIXDATA_*EDGE

On Wed, Feb 28, 2018 at 05:14:52PM +0100, Giulio Benetti wrote:
> Handle both positive and negative dclk polarity,
> according to bus_flags.
> 
> Signed-off-by: Giulio Benetti <giulio.benetti@...ronovasrl.com>
> ---
>  drivers/gpu/drm/sun4i/sun4i_tcon.c | 13 ++++++++++++-
>  1 file changed, 12 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/sun4i/sun4i_tcon.c b/drivers/gpu/drm/sun4i/sun4i_tcon.c
> index aaf911a..534e5ee 100644
> --- a/drivers/gpu/drm/sun4i/sun4i_tcon.c
> +++ b/drivers/gpu/drm/sun4i/sun4i_tcon.c
> @@ -17,6 +17,7 @@
>  #include <drm/drm_encoder.h>
>  #include <drm/drm_modes.h>
>  #include <drm/drm_of.h>
> +#include <drm/drm_panel.h>
>  
>  #include <uapi/drm/drm_mode.h>
>  
> @@ -340,6 +341,9 @@ static void sun4i_tcon0_mode_set_lvds(struct sun4i_tcon *tcon,
>  static void sun4i_tcon0_mode_set_rgb(struct sun4i_tcon *tcon,
>  				     const struct drm_display_mode *mode)
>  {
> +	struct drm_panel *panel = tcon->panel;
> +	struct drm_connector *connector = panel->connector;
> +	struct drm_display_info display_info = connector->display_info;
>  	unsigned int bp, hsync, vsync;
>  	u8 clk_delay;
>  	u32 val = 0;
> @@ -395,8 +399,15 @@ static void sun4i_tcon0_mode_set_rgb(struct sun4i_tcon *tcon,
>  	if (mode->flags & DRM_MODE_FLAG_PVSYNC)
>  		val |= SUN4I_TCON0_IO_POL_VSYNC_POSITIVE;
>  
> +	if (display_info.bus_flags & DRM_BUS_FLAG_PIXDATA_POSEDGE)
> +		clk_set_phase(tcon->dclk, 240);
> +
> +	if (display_info.bus_flags & DRM_BUS_FLAG_PIXDATA_NEGEDGE)
> +		clk_set_phase(tcon->dclk, 0);
> +

This needs to have a whole bunch of comments here. We want to have
basically the whole discussion we had by mail previously about this in
there.

And the same goes for your commit log.

>  	regmap_update_bits(tcon->regs, SUN4I_TCON0_IO_POL_REG,
> -			   SUN4I_TCON0_IO_POL_HSYNC_POSITIVE | SUN4I_TCON0_IO_POL_VSYNC_POSITIVE,
> +			   SUN4I_TCON0_IO_POL_HSYNC_POSITIVE |
> +			   SUN4I_TCON0_IO_POL_VSYNC_POSITIVE,
>  			   val);

This has nothing to do with your patch.

Maxime

-- 
Maxime Ripard, Bootlin (formerly Free Electrons)
Embedded Linux and Kernel engineering
https://bootlin.com

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