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Subject[PATCH v5 1/3] drm: add bus_formats and num_bus_formats fields to drm_display_info
Date
Add bus_formats and num_bus_formats fields and
drm_display_info_set_bus_formats helper function to specify the bus
formats supported by a given display.

This information can be used by display controller drivers to configure
the output interface appropriately (i.e. RGB565, RGB666 or RGB888 on raw
RGB or LVDS busses).

Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Acked-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Acked-by: Philipp Zabel <p.zabel@pengutronix.de>
---
drivers/gpu/drm/drm_crtc.c | 35 +++++++++++++++++++++++++++++++++++
include/drm/drm_crtc.h | 8 ++++++++
2 files changed, 43 insertions(+)

diff --git a/drivers/gpu/drm/drm_crtc.c b/drivers/gpu/drm/drm_crtc.c
index e79c8d3..1295863 100644
--- a/drivers/gpu/drm/drm_crtc.c
+++ b/drivers/gpu/drm/drm_crtc.c
@@ -764,6 +764,40 @@ static void drm_mode_remove(struct drm_connector *connector,
}

/**
+ * drm_display_info_set_bus_formats - set the supported bus formats
+ * @info: display info to store bus formats in
+ * @fmts: array containing the supported bus formats
+ * @nfmts: the number of entries in the fmts array
+ *
+ * Store the supported bus formats in display info structure.
+ * See MEDIA_BUS_FMT_* definitions in include/uapi/linux/media-bus-format.h for
+ * a full list of available formats.
+ */
+int drm_display_info_set_bus_formats(struct drm_display_info *info,
+ const u32 *formats,
+ unsigned int num_formats)
+{
+ u32 *fmts = NULL;
+
+ if (!formats && num_formats)
+ return -EINVAL;
+
+ if (formats && num_formats) {
+ fmts = kmemdup(formats, sizeof(*formats) * num_formats,
+ GFP_KERNEL);
+ if (!formats)
+ return -ENOMEM;
+ }
+
+ kfree(info->bus_formats);
+ info->bus_formats = fmts;
+ info->num_bus_formats = num_formats;
+
+ return 0;
+}
+EXPORT_SYMBOL(drm_display_info_set_bus_formats);
+
+/**
* drm_connector_get_cmdline_mode - reads the user's cmdline mode
* @connector: connector to quwery
* @mode: returned mode
@@ -914,6 +948,7 @@ void drm_connector_cleanup(struct drm_connector *connector)
ida_remove(&drm_connector_enum_list[connector->connector_type].ida,
connector->connector_type_id);

+ kfree(connector->display_info.bus_formats);
drm_mode_object_put(dev, &connector->base);
kfree(connector->name);
connector->name = NULL;
diff --git a/include/drm/drm_crtc.h b/include/drm/drm_crtc.h
index c40070a..5d351f5 100644
--- a/include/drm/drm_crtc.h
+++ b/include/drm/drm_crtc.h
@@ -31,6 +31,7 @@
#include <linux/idr.h>
#include <linux/fb.h>
#include <linux/hdmi.h>
+#include <linux/media-bus-format.h>
#include <uapi/drm/drm_mode.h>
#include <uapi/drm/drm_fourcc.h>
#include <drm/drm_modeset_lock.h>
@@ -130,6 +131,9 @@ struct drm_display_info {
enum subpixel_order subpixel_order;
u32 color_formats;

+ const u32 *bus_formats;
+ unsigned int num_bus_formats;
+
/* Mask of supported hdmi deep color modes */
u8 edid_hdmi_dc_modes;

@@ -982,6 +986,10 @@ extern int drm_mode_connector_set_path_property(struct drm_connector *connector,
extern int drm_mode_connector_update_edid_property(struct drm_connector *connector,
struct edid *edid);

+extern int drm_display_info_set_bus_formats(struct drm_display_info *info,
+ const u32 *formats,
+ unsigned int num_formats);
+
static inline bool drm_property_type_is(struct drm_property *property,
uint32_t type)
{
--
1.9.1


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