*/
#include <drm/drm_dp_helper.h>
+#include <drm/drm_print.h>
#include "dp.h"
+static const u8 drm_dp_edp_revisions[] = { 0x11, 0x12, 0x13, 0x14 };
+
static void drm_dp_link_caps_reset(struct drm_dp_link_caps *caps)
{
caps->enhanced_framing = false;
link->max_lanes = 0;
drm_dp_link_caps_reset(&link->caps);
+ link->edp = 0;
link->rate = 0;
link->lanes = 0;
*/
int drm_dp_link_probe(struct drm_dp_aux *aux, struct drm_dp_link *link)
{
- u8 dpcd[DP_RECEIVER_CAP_SIZE];
+ u8 dpcd[DP_RECEIVER_CAP_SIZE], value;
int err;
drm_dp_link_reset(link);
link->caps.fast_training = drm_dp_fast_training_cap(dpcd);
link->caps.channel_coding = drm_dp_channel_coding_supported(dpcd);
- if (drm_dp_alternate_scrambler_reset_cap(dpcd))
+ if (drm_dp_alternate_scrambler_reset_cap(dpcd)) {
link->caps.alternate_scrambler_reset = true;
+ err = drm_dp_dpcd_readb(aux, DP_EDP_DPCD_REV, &value);
+ if (err < 0)
+ return err;
+
+ if (value >= ARRAY_SIZE(drm_dp_edp_revisions))
+ DRM_ERROR("unsupported eDP version: %02x\n", value);
+ else
+ link->edp = drm_dp_edp_revisions[value];
+ }
+
link->rate = link->max_rate;
link->lanes = link->max_lanes;
* @max_rate: maximum clock rate supported on the link
* @max_lanes: maximum number of lanes supported on the link
* @caps: capabilities supported on the link (see &drm_dp_link_caps)
+ * @edp: eDP revision (0x11: eDP 1.1, 0x12: eDP 1.2, ...)
* @rate: currently configured link rate
* @lanes: currently configured number of lanes
*/
unsigned int max_lanes;
struct drm_dp_link_caps caps;
+ unsigned char edp;
unsigned int rate;
unsigned int lanes;