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@xxxxxxxxxxxxxxxxxx>
---
drivers/gpu/drm/drm_crtc.c | 32 ++++++++++++++++++++++++++++++++
include/drm/drm_crtc.h | 7 +++++++
2 files changed, 39 insertions(+)
diff --git a/drivers/gpu/drm/drm_crtc.c b/drivers/gpu/drm/drm_crtc.c
index e79c8d3..d3b7ed0 100644
--- a/drivers/gpu/drm/drm_crtc.c
+++ b/drivers/gpu/drm/drm_crtc.c
@@ -763,6 +763,38 @@ static void drm_mode_remove(struct drm_connector *connector,
drm_mode_destroy(connector->dev, mode);
}
+/*
+ * 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 suppported 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 *fmts,
+ unsigned int num_fmts)
+{
+ u32 *formats = NULL;
+
+ if (!fmts && num_fmts)
+ return -EINVAL;
+
+ if (fmts && num_fmts) {
+ formats = kmemdup(fmts, sizeof(*fmts) * num_fmts, GFP_KERNEL);
+ if (!formats)
+ return -ENOMEM;
+ }
+
+ kfree(info->bus_formats);
+ info->bus_formats = formats;
+ info->num_bus_formats = num_fmts;
+
+ 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
diff --git a/include/drm/drm_crtc.h b/include/drm/drm_crtc.h
index c40070a..a35844f 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 +986,9 @@ 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 *fmts, unsigned int nfmts);
+
static inline bool drm_property_type_is(struct drm_property *property,
uint32_t type)
{
--
1.9.1
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