drm/radeon/kms: parse the extended LCD info block

This block may contain various additional LCD info such
as physical size and a stored EDID.

Signed-off-by: Alex Deucher <alexdeucher@gmail.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

4 files changed, 67 insertions, 5 deletions

diff --git a/drivers/gpu/drm/radeon/radeon_atombios.c b/drivers/gpu/drm/radeon/radeon_atombios.c
index 35c5ff09040d..d6c611eee204 100644
--- a/drivers/gpu/drm/radeon/radeon_atombios.c
+++ b/drivers/gpu/drm/radeon/radeon_atombios.c
@@ -1515,6 +1515,59 @@ struct radeon_encoder_atom_dig *radeon_atombios_get_lvds_info(struct
                 else
                         lvds->linkb = false;
 
+                /* parse the lcd record table */
+                if (lvds_info->info.usModePatchTableOffset) {
+                        ATOM_FAKE_EDID_PATCH_RECORD *fake_edid_record;
+                        ATOM_PANEL_RESOLUTION_PATCH_RECORD *panel_res_record;
+                        bool bad_record = false;
+                        u8 *record = (u8 *)(mode_info->atom_context->bios +
+                                            data_offset +
+                                            lvds_info->info.usModePatchTableOffset);
+                        while (*record != ATOM_RECORD_END_TYPE) {
+                                switch (*record) {
+                                case LCD_MODE_PATCH_RECORD_MODE_TYPE:
+                                        record += sizeof(ATOM_PATCH_RECORD_MODE);
+                                        break;
+                                case LCD_RTS_RECORD_TYPE:
+                                        record += sizeof(ATOM_LCD_RTS_RECORD);
+                                        break;
+                                case LCD_CAP_RECORD_TYPE:
+                                        record += sizeof(ATOM_LCD_MODE_CONTROL_CAP);
+                                        break;
+                                case LCD_FAKE_EDID_PATCH_RECORD_TYPE:
+                                        fake_edid_record = (ATOM_FAKE_EDID_PATCH_RECORD *)record;
+                                        if (fake_edid_record->ucFakeEDIDLength) {
+                                                struct edid *edid;
+                                                int edid_size =
+                                                        max((int)EDID_LENGTH, (int)fake_edid_record->ucFakeEDIDLength);
+                                                edid = kmalloc(edid_size, GFP_KERNEL);
+                                                if (edid) {
+                                                        memcpy((u8 *)edid, (u8 *)&fake_edid_record->ucFakeEDIDString[0],
+                                                               fake_edid_record->ucFakeEDIDLength);
+
+                                                        if (drm_edid_is_valid(edid))
+                                                                rdev->mode_info.bios_hardcoded_edid = edid;
+                                                        else
+                                                                kfree(edid);
+                                                }
+                                        }
+                                        record += sizeof(ATOM_FAKE_EDID_PATCH_RECORD);
+                                        break;
+                                case LCD_PANEL_RESOLUTION_RECORD_TYPE:
+                                        panel_res_record = (ATOM_PANEL_RESOLUTION_PATCH_RECORD *)record;
+                                        lvds->native_mode.width_mm = panel_res_record->usHSize;
+                                        lvds->native_mode.height_mm = panel_res_record->usVSize;
+                                        record += sizeof(ATOM_PANEL_RESOLUTION_PATCH_RECORD);
+                                        break;
+                                default:
+                                        DRM_ERROR("Bad LCD record %d\n", *record);
+                                        bad_record = true;
+                                        break;
+                                }
+                                if (bad_record)
+                                        break;
+                        }
+                }
         }
         return lvds;
 }
diff --git a/drivers/gpu/drm/radeon/radeon_combios.c b/drivers/gpu/drm/radeon/radeon_combios.c
index 3bddea5b5295..111a844c1ecb 100644
--- a/drivers/gpu/drm/radeon/radeon_combios.c
+++ b/drivers/gpu/drm/radeon/radeon_combios.c
@@ -471,8 +471,9 @@ bool radeon_combios_check_hardcoded_edid(struct radeon_device *rdev)
         return true;
 }
 
+/* this is used for atom LCDs as well */
 struct edid *
-radeon_combios_get_hardcoded_edid(struct radeon_device *rdev)
+radeon_bios_get_hardcoded_edid(struct radeon_device *rdev)
 {
         if (rdev->mode_info.bios_hardcoded_edid)
                 return rdev->mode_info.bios_hardcoded_edid;
diff --git a/drivers/gpu/drm/radeon/radeon_display.c b/drivers/gpu/drm/radeon/radeon_display.c
index 7b17e639ab32..acebbc76c2f9 100644
--- a/drivers/gpu/drm/radeon/radeon_display.c
+++ b/drivers/gpu/drm/radeon/radeon_display.c
@@ -679,9 +679,17 @@ int radeon_ddc_get_modes(struct radeon_connector *radeon_connector)
         if (!radeon_connector->edid) {
                 radeon_connector->edid = drm_get_edid(&radeon_connector->base, &radeon_connector->ddc_bus->adapter);
         }
-        /* some servers provide a hardcoded edid in rom for KVMs */
-        if (!radeon_connector->edid)
-                radeon_connector->edid = radeon_combios_get_hardcoded_edid(rdev);
+
+        if (!radeon_connector->edid) {
+                if (rdev->is_atom_bios) {
+                        /* some laptops provide a hardcoded edid in rom for LCDs */
+                        if (((radeon_connector->base.connector_type == DRM_MODE_CONNECTOR_LVDS) ||
+                             (radeon_connector->base.connector_type == DRM_MODE_CONNECTOR_eDP)))
+                                radeon_connector->edid = radeon_bios_get_hardcoded_edid(rdev);
+                } else
+                        /* some servers provide a hardcoded edid in rom for KVMs */
+                        radeon_connector->edid = radeon_bios_get_hardcoded_edid(rdev);
+        }
         if (radeon_connector->edid) {
                 drm_mode_connector_update_edid_property(&radeon_connector->base, radeon_connector->edid);
                 ret = drm_add_edid_modes(&radeon_connector->base, radeon_connector->edid);
diff --git a/drivers/gpu/drm/radeon/radeon_mode.h b/drivers/gpu/drm/radeon/radeon_mode.h
index f406f02bf14e..fd185f783a31 100644
--- a/drivers/gpu/drm/radeon/radeon_mode.h
+++ b/drivers/gpu/drm/radeon/radeon_mode.h
@@ -566,7 +566,7 @@ extern int radeon_get_crtc_scanoutpos(struct drm_device *dev, int crtc,
 
 extern bool radeon_combios_check_hardcoded_edid(struct radeon_device *rdev);
 extern struct edid *
-radeon_combios_get_hardcoded_edid(struct radeon_device *rdev);
+radeon_bios_get_hardcoded_edid(struct radeon_device *rdev);
 extern bool radeon_atom_get_clock_info(struct drm_device *dev);
 extern bool radeon_combios_get_clock_info(struct drm_device *dev);
 extern struct radeon_encoder_atom_dig *