Subject: [PATCHv5][ 4/8] staging: imx-drm: Use de-active and pixelclk-active display-timings.

From: [email-masked] (Marek Vasut)
Date: Thu, 5 Dec 2013 21:54:32 +0100

On Thursday, December 05, 2013 at 07:28:08 PM, Denis Carikli wrote:
> If de-active and/or pixelclk-active properties were set in the
> display-timings DT node, they were not used.
> 
> Instead the data-enable and the pixel data clock polarity
> were hardcoded.
> 
> This change is needed for making the eukrea-cpuimx51
>   QVGA display work.
> 
> Greg Kroah-Hartman <[email-masked]>
> Cc: driverdev-devel at linuxdriverproject.org
> Cc: Philipp Zabel <[email-masked]>
> Cc: Sascha Hauer <[email-masked]>
> Cc: Shawn Guo <[email-masked]>
> Cc: linux-arm-kernel at lists.infradead.org
> Cc: David Airlie <[email-masked]>
> Cc: dri-devel at lists.freedesktop.org
> Cc: Eric B?nard <[email-masked]>
> Signed-off-by: Denis Carikli <[email-masked]>
> ---
> ChangeLog v3->v4:
> - The old patch was named "staging: imx-drm: ipuv3-crtc: don't harcode some
> mode". - Reworked the patch entierly: we now takes the mode flags from the
> device tree.
> 
> ChangeLog v2->v3:
> - Added some interested people in the Cc list.
> - Ajusted the flags to match the changes in "drm: Add the lacking
>   DRM_MODE_FLAG_* for matching the DISPLAY_FLAGS_*"
> ---
>  drivers/staging/imx-drm/imx-drm.h          |    3 +++
>  drivers/staging/imx-drm/ipuv3-crtc.c       |   11 +++++++++--
>  drivers/staging/imx-drm/parallel-display.c |   28
> ++++++++++++++++++++++++++++ 3 files changed, 40 insertions(+), 2
> deletions(-)
> 
> diff --git a/drivers/staging/imx-drm/imx-drm.h
> b/drivers/staging/imx-drm/imx-drm.h index ae90c9c..dfdc180 100644
> --- a/drivers/staging/imx-drm/imx-drm.h
> +++ b/drivers/staging/imx-drm/imx-drm.h
> @@ -5,6 +5,9 @@
> 
>  #define IPU_PIX_FMT_GBR24	v4l2_fourcc('G', 'B', 'R', '3')
> 
> +#define IMXDRM_MODE_FLAG_DE_HIGH		(1<<0)
> +#define IMXDRM_MODE_FLAG_PIXDATA_POSEDGE	(1<<1)
> +
>  struct drm_crtc;
>  struct drm_connector;
>  struct drm_device;
> diff --git a/drivers/staging/imx-drm/ipuv3-crtc.c
> b/drivers/staging/imx-drm/ipuv3-crtc.c index ce6ba98..f3d2cae 100644
> --- a/drivers/staging/imx-drm/ipuv3-crtc.c
> +++ b/drivers/staging/imx-drm/ipuv3-crtc.c
> @@ -156,8 +156,15 @@ static int ipu_crtc_mode_set(struct drm_crtc *crtc,
>  	if (mode->flags & DRM_MODE_FLAG_PVSYNC)
>  		sig_cfg.Vsync_pol = 1;
> 
> -	sig_cfg.enable_pol = 1;
> -	sig_cfg.clk_pol = 1;
> +	/* Such flags are not availables in the DRM modes header,
> +	 * and we don't want to export them to userspace.
> +	 */

The multiline comment here is not correct.

> +	if (mode->private_flags & IMXDRM_MODE_FLAG_DE_HIGH)
> +		sig_cfg.enable_pol = 1;
> +
> +	if (mode->private_flags & IMXDRM_MODE_FLAG_PIXDATA_POSEDGE)
> +		sig_cfg.clk_pol = 1;
> +
>  	sig_cfg.width = mode->hdisplay;
>  	sig_cfg.height = mode->vdisplay;
>  	sig_cfg.pixel_fmt = out_pixel_fmt;
> diff --git a/drivers/staging/imx-drm/parallel-display.c
> b/drivers/staging/imx-drm/parallel-display.c index bb71d6d..65d0c18 100644
> --- a/drivers/staging/imx-drm/parallel-display.c
> +++ b/drivers/staging/imx-drm/parallel-display.c
> @@ -74,7 +74,35 @@ static int imx_pd_connector_get_modes(struct
> drm_connector *connector)
> 
>  	if (np) {
>  		struct drm_display_mode *mode = drm_mode_create(connector->dev);
> +		struct device_node *timings_np;
> +		struct device_node *mode_np;
> +		u32 val;
> +
>  		of_get_drm_display_mode(np, &imxpd->mode, 0);
> +
> +		/* Such flags are not availables in the DRM modes header,
> +		 * and we don't want to export them to userspace.
> +		 */

DTTO

> +		timings_np = of_get_child_by_name(np, "display-timings");
> +		if (timings_np) {
> +			/* get the display mode node */
> +			mode_np = of_parse_phandle(timings_np,
> +						   "native-mode", 0);
> +			if (!mode_np)
> +				mode_np = of_get_next_child(timings_np, NULL);
> +
> +			/* set de-active to 1 if not set */
> +			of_property_read_u32(mode_np, "de-active", &val);
> +			if (!!val)

'if (val)' is enough.

> +				imxpd->mode.private_flags |=
> +					IMXDRM_MODE_FLAG_DE_HIGH;
> +
> +			/* set pixelclk-active to 1 if not set */
> +			of_property_read_u32(mode_np, "pixelclk-active", &val);
> +			if (!!val)

DTTO, also please add {} around multiline expression.

> +				imxpd->mode.private_flags |=
> +					IMXDRM_MODE_FLAG_PIXDATA_POSEDGE;
> +		}
>  		drm_mode_copy(mode, &imxpd->mode);
>  		mode->type |= DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED,
>  		drm_mode_probed_add(connector, mode);