drm: Helper to read max bits per component

Helper routine to read out maximum supported bits per
component for DisplayPort legay converters.

v2: Return early if detailed port cap info is not available.
    Replace if-else ladder with switch-case (Ville)

Reviewed-by: Jim Bride <jim.bride@linux.intel.com>
Signed-off-by: Mika Kahola <mika.kahola@intel.com>
Acked-by: Dave Airlie <airlied@gmail.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1473419458-17080-5-git-send-email-mika.kahola@intel.com

2 files changed, 44 insertions, 0 deletions

diff --git a/drivers/gpu/drm/drm_dp_helper.c b/drivers/gpu/drm/drm_dp_helper.c
index f171fbf8b1b9..57c61d126a56 100644
--- a/drivers/gpu/drm/drm_dp_helper.c
+++ b/drivers/gpu/drm/drm_dp_helper.c
@@ -471,6 +471,48 @@ int drm_dp_downstream_max_clock(const u8 dpcd[DP_RECEIVER_CAP_SIZE],
 }
 EXPORT_SYMBOL(drm_dp_downstream_max_clock);
 
+/**
+ * drm_dp_downstream_max_bpc() - extract branch device max
+ *                               bits per component
+ * @dpcd: DisplayPort configuration data
+ * @port_cap: port capabilities
+ *
+ * Returns max bpc on success or 0 if max bpc not defined
+ */
+int drm_dp_downstream_max_bpc(const u8 dpcd[DP_RECEIVER_CAP_SIZE],
+                              const u8 port_cap[4])
+{
+        int type = port_cap[0] & DP_DS_PORT_TYPE_MASK;
+        bool detailed_cap_info = dpcd[DP_DOWNSTREAMPORT_PRESENT] &
+                DP_DETAILED_CAP_INFO_AVAILABLE;
+        int bpc;
+
+        if (!detailed_cap_info)
+                return 0;
+
+        switch (type) {
+        case DP_DS_PORT_TYPE_VGA:
+        case DP_DS_PORT_TYPE_DVI:
+        case DP_DS_PORT_TYPE_HDMI:
+        case DP_DS_PORT_TYPE_DP_DUALMODE:
+                bpc = port_cap[2] & DP_DS_MAX_BPC_MASK;
+
+                switch (bpc) {
+                case DP_DS_8BPC:
+                        return 8;
+                case DP_DS_10BPC:
+                        return 10;
+                case DP_DS_12BPC:
+                        return 12;
+                case DP_DS_16BPC:
+                        return 16;
+                }
+        default:
+                return 0;
+        }
+}
+EXPORT_SYMBOL(drm_dp_downstream_max_bpc);
+
 /*
  * I2C-over-AUX implementation
  */
diff --git a/include/drm/drm_dp_helper.h b/include/drm/drm_dp_helper.h
index 60dd9dca4ce2..f3d14240338e 100644
--- a/include/drm/drm_dp_helper.h
+++ b/include/drm/drm_dp_helper.h
@@ -817,6 +817,8 @@ int drm_dp_link_power_down(struct drm_dp_aux *aux, struct drm_dp_link *link);
 int drm_dp_link_configure(struct drm_dp_aux *aux, struct drm_dp_link *link);
 int drm_dp_downstream_max_clock(const u8 dpcd[DP_RECEIVER_CAP_SIZE],
                                 const u8 port_cap[4]);
+int drm_dp_downstream_max_bpc(const u8 dpcd[DP_RECEIVER_CAP_SIZE],
+                              const u8 port_cap[4]);
 
 void drm_dp_aux_init(struct drm_dp_aux *aux);
 int drm_dp_aux_register(struct drm_dp_aux *aux);