Re: [PATCH 09/24] drm/omap: Do dss_device (display) ordering in omap_drv.c

[Laurent Pinchart <laurent.pinchart@ideasonboard.com>]

Hi Tomi,

Thank you for the patch.

On Monday, 12 February 2018 11:44:39 EET Tomi Valkeinen wrote:
> From: Peter Ujfalusi <peter.ujfalusi@ti.com>
> 
> Sort the dssdev array based on DT aliases.
> 
> With this change we can remove the panel ordering from dss/display.c and
> have all sorting related to dssdevs in one place.
> 
> Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
> Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
> ---
>  drivers/gpu/drm/omapdrm/dss/display.c |  2 ++
>  drivers/gpu/drm/omapdrm/dss/omapdss.h |  1 +
>  drivers/gpu/drm/omapdrm/omap_drv.c    | 18 ++++++++++++++++++
>  3 files changed, 21 insertions(+)
> 
> diff --git a/drivers/gpu/drm/omapdrm/dss/display.c
> b/drivers/gpu/drm/omapdrm/dss/display.c index 424143128cd4..3ef99f344bd3
> 100644
> --- a/drivers/gpu/drm/omapdrm/dss/display.c
> +++ b/drivers/gpu/drm/omapdrm/dss/display.c
> @@ -52,6 +52,8 @@ int omapdss_register_display(struct omap_dss_device
> *dssdev) if (id < 0)
>  		id = disp_num_counter++;
> 
> +	dssdev->alias_id = id;
> +
>  	snprintf(dssdev->alias, sizeof(dssdev->alias), "display%d", id);
> 
>  	/* Use 'label' property for name, if it exists */
> diff --git a/drivers/gpu/drm/omapdrm/dss/omapdss.h
> b/drivers/gpu/drm/omapdrm/dss/omapdss.h index 4222661d4c88..bd5f174a3c56
> 100644
> --- a/drivers/gpu/drm/omapdrm/dss/omapdss.h
> +++ b/drivers/gpu/drm/omapdrm/dss/omapdss.h
> @@ -478,6 +478,7 @@ struct omap_dss_device {
> 
>  	/* alias in the form of "display%d" */
>  	char alias[16];
> +	int alias_id;

Can the alias ID be negative ? Apart from that,

Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

>  	enum omap_display_type type;
>  	enum omap_display_type output_type;
> diff --git a/drivers/gpu/drm/omapdrm/omap_drv.c
> b/drivers/gpu/drm/omapdrm/omap_drv.c index b5061fc7241a..877c3749f69b
> 100644
> --- a/drivers/gpu/drm/omapdrm/omap_drv.c
> +++ b/drivers/gpu/drm/omapdrm/omap_drv.c
> @@ -15,6 +15,8 @@
>   * this program.  If not, see <http://www.gnu.org/licenses/>.
>   */
> 
> +#include <linux/of.h>
> +#include <linux/sort.h>
>  #include <linux/sys_soc.h>
> 
>  #include <drm/drm_atomic.h>
> @@ -165,6 +167,18 @@ static void omap_disconnect_dssdevs(struct drm_device
> *ddev) priv->num_dssdevs = 0;
>  }
> 
> +static int omap_compare_dssdevs(const void *a, const void *b)
> +{
> +	const struct omap_dss_device *dssdev1 = *(struct omap_dss_device **)a;
> +	const struct omap_dss_device *dssdev2 = *(struct omap_dss_device **)b;
> +
> +	if (dssdev1->alias_id > dssdev2->alias_id)
> +		return 1;
> +	else if (dssdev1->alias_id < dssdev2->alias_id)
> +		return -1;
> +	return 0;
> +}
> +
>  static void omap_collect_dssdevs(struct drm_device *ddev)
>  {
>  	struct omap_drm_private *priv = ddev->dev_private;
> @@ -179,6 +193,10 @@ static void omap_collect_dssdevs(struct drm_device
> *ddev) break;
>  		}
>  	}
> +
> +	/* Sort the list by DT aliases */
> +	sort(priv->dssdevs, priv->num_dssdevs, sizeof(priv->dssdevs[0]),
> +	     omap_compare_dssdevs, NULL);
>  }
> 
>  static int omap_connect_dssdevs(struct drm_device *ddev)

-- 
Regards,

Laurent Pinchart

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