Re: [PATCHv2 2/3] drm/imx: convey the pixelclk-active and de-active flags from DT to the ipu-di driver

[Philipp Zabel]

Hi Lothar,

thank you for rebasing. I have applied the other two patches.
With this one, I'd like to avoid the duplicated code. See below:

Am Dienstag, den 24.05.2016, 08:31 +0200 schrieb Lothar WaÃmann:
> Currently these flags are lost in the call
> drm_display_mode_from_videomode()
> 
> Signed-off-by: Lothar WaÃmann <LW@xxxxxxxxxxxxxxxxxxx>
> ---
>  drivers/gpu/drm/imx/imx-ldb.c          | 37 ++++++++++++++++++++++++++--------
>  drivers/gpu/drm/imx/parallel-display.c | 31 ++++++++++++++++++++++++----
>  2 files changed, 56 insertions(+), 12 deletions(-)
> 
> diff --git a/drivers/gpu/drm/imx/imx-ldb.c b/drivers/gpu/drm/imx/imx-ldb.c
> index b2dc4df..b17a246 100644
> --- a/drivers/gpu/drm/imx/imx-ldb.c
> +++ b/drivers/gpu/drm/imx/imx-ldb.c
[...]
> @@ -601,10 +606,26 @@ static int imx_ldb_bind(struct device *dev, struct device *master, void *data)
>  			channel->edid = kmemdup(edidp, channel->edid_len,
>  						GFP_KERNEL);
>  		} else if (!channel->panel) {
> -			ret = of_get_drm_display_mode(child, &channel->mode,
> -						OF_USE_NATIVE_MODE);
> -			if (!ret)
> -				channel->mode_valid = 1;
> +			struct videomode vm;
> +
> +			ret = of_get_videomode(child, &vm, OF_USE_NATIVE_MODE);
> +			if (ret)
> +				return ret;
> +			drm_display_mode_from_videomode(&vm, &channel->mode);
> +
> +			if (vm.flags & DISPLAY_FLAGS_PIXDATA_POSEDGE)
> +				channel->bus_flags |= DRM_BUS_FLAG_PIXDATA_POSEDGE;
> +			if (vm.flags & DISPLAY_FLAGS_PIXDATA_NEGEDGE)
> +				channel->bus_flags |= DRM_BUS_FLAG_PIXDATA_NEGEDGE;
> +
> +			if (vm.flags & DISPLAY_FLAGS_DE_LOW)
> +				channel->bus_flags |= DRM_BUS_FLAG_DE_LOW;
> +			if (vm.flags & DISPLAY_FLAGS_DE_HIGH)
> +				channel->bus_flags |= DRM_BUS_FLAG_DE_HIGH;
> +
> +			drm_mode_debug_printmodeline(&channel->mode);
> +			channel->mode_valid = 1;
[...]
> @@ -81,10 +87,27 @@ static int imx_pd_connector_get_modes(struct drm_connector *connector)
>  
>  	if (np) {
>  		struct drm_display_mode *mode = drm_mode_create(connector->dev);
> +		struct videomode vm;
> +		int ret;
>  
>  		if (!mode)
>  			return -EINVAL;
> -		of_get_drm_display_mode(np, &imxpd->mode, OF_USE_NATIVE_MODE);
> +
> +		ret = of_get_videomode(np, &vm, OF_USE_NATIVE_MODE);
> +		if (ret)
> +			return ret;
> +		drm_display_mode_from_videomode(&vm, &imxpd->mode);
> +		drm_mode_debug_printmodeline(&imxpd->mode);
> +
> +		if (vm.flags & DISPLAY_FLAGS_PIXDATA_POSEDGE)
> +			imxpd->bus_flags |= DRM_BUS_FLAG_PIXDATA_POSEDGE;
> +		if (vm.flags & DISPLAY_FLAGS_PIXDATA_NEGEDGE)
> +			imxpd->bus_flags |= DRM_BUS_FLAG_PIXDATA_NEGEDGE;
> +
> +		if (vm.flags & DISPLAY_FLAGS_DE_LOW)
> +			imxpd->bus_flags |= DRM_BUS_FLAG_DE_LOW;
> +		if (vm.flags & DISPLAY_FLAGS_DE_HIGH)
> +			imxpd->bus_flags |= DRM_BUS_FLAG_DE_HIGH;

This could be shared between ldb and parallel drivers if you extended
of_get_drm_display_mode to also return bus_flags, for example. The flags
translation could be put into a drm_bus_flags_from_videomode helper.

regards
Philipp