linux-kernel - Re: [PATCH 1/2] drm/sun4i: Handle DRM_BUS_FLAG_PIXDATA

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Date:   Mon, 22 Jan 2018 09:45:45 +0100
From:   Maxime Ripard <maxime.ripard@...e-electrons.com>
To:     Giulio Benetti <giulio.benetti@...ronovasrl.com>
Cc:     airlied@...ux.ie, wens@...e.org, dri-devel@...ts.freedesktop.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] drm/sun4i: Handle DRM_BUS_FLAG_PIXDATA_*EDGE

Hi,

On Sat, Jan 20, 2018 at 07:50:20PM +0100, Giulio Benetti wrote:
> Can't set dclk polarity on sun4i.
> 
> Handle both positive and negative dclk polarity,
> according to bus_flags.

It's not really that we can't set it, it's that it's been ignored.

> Signed-off-by: Giulio Benetti <giulio.benetti@...ronovasrl.com>
> ---
>  drivers/gpu/drm/sun4i/sun4i_tcon.c | 11 ++++++++++-
>  1 file changed, 10 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/sun4i/sun4i_tcon.c b/drivers/gpu/drm/sun4i/sun4i_tcon.c
> index f4284b5..6121210 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>
>  
> @@ -173,6 +174,9 @@ static void sun4i_tcon0_mode_set_common(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;
> @@ -226,8 +230,13 @@ 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)
> +		val |= SUN4I_TCON0_IO_POL_DCLK_PHASE(1);
> +

Checkpatch here returns:
ERROR: space required before the open parenthesis '('

And, where did you find that info? How does it interact with the
set_phase callback of the dotclock driver?

Maxime

-- 
Maxime Ripard, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com

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