drm/radeon/kms: add support for hardcoded edids in rom (v2)

Some servers hardcode an edid in rom so that they will
work properly with KVMs.  This is a port of the relevant
code from the ddx.

[airlied: reworked to validate edid at boot stage - and
remove special quirk, if there is a valid EDID in the BIOS rom
we'll just try and use it.]

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

diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
index f665b05..f41e91c 100644 (file)
--- a/drivers/gpu/drm/drm_edid.c
+++ b/drivers/gpu/drm/drm_edid.c
@@ -60,8 +60,7 @@
 #define EDID_QUIRK_FIRST_DETAILED_PREFERRED    (1 << 5)
 /* use +hsync +vsync for detailed mode */
 #define EDID_QUIRK_DETAILED_SYNC_PP            (1 << 6)
-/* define the number of Extension EDID block */
-#define MAX_EDID_EXT_NUM 4
+
 
 #define LEVEL_DMT      0
 #define LEVEL_GTF      1
@@ -114,14 +113,14 @@ static const u8 edid_header[] = {
 };
 
 /**
- * edid_is_valid - sanity check EDID data
+ * drm_edid_is_valid - sanity check EDID data
  * @edid: EDID data
  *
  * Sanity check the EDID block by looking at the header, the version number
  * and the checksum.  Return 0 if the EDID doesn't check out, or 1 if it's
  * valid.
  */
-static bool edid_is_valid(struct edid *edid)
+bool drm_edid_is_valid(struct edid *edid)
 {
        int i, score = 0;
        u8 csum = 0;
@@ -163,6 +162,7 @@ bad:
        }
        return 0;
 }
+EXPORT_SYMBOL(drm_edid_is_valid);
 
 /**
  * edid_vendor - match a string against EDID's obfuscated vendor field
@@ -1069,8 +1069,8 @@ static int add_detailed_info_eedid(struct drm_connector *connector,
        }
 
        /* Chose real EDID extension number */
-       edid_ext_num = edid->extensions > MAX_EDID_EXT_NUM ?
-                      MAX_EDID_EXT_NUM : edid->extensions;
+       edid_ext_num = edid->extensions > DRM_MAX_EDID_EXT_NUM ?
+               DRM_MAX_EDID_EXT_NUM : edid->extensions;
 
        /* Find CEA extension */
        for (i = 0; i < edid_ext_num; i++) {
@@ -1152,7 +1152,7 @@ static int drm_ddc_read_edid(struct drm_connector *connector,
        for (i = 0; i < 4; i++) {
                if (drm_do_probe_ddc_edid(adapter, buf, len))
                        return -1;
-               if (edid_is_valid((struct edid *)buf))
+               if (drm_edid_is_valid((struct edid *)buf))
                        return 0;
        }
 
@@ -1177,7 +1177,7 @@ struct edid *drm_get_edid(struct drm_connector *connector,
        int ret;
        struct edid *edid;
 
-       edid = kmalloc(EDID_LENGTH * (MAX_EDID_EXT_NUM + 1),
+       edid = kmalloc(EDID_LENGTH * (DRM_MAX_EDID_EXT_NUM + 1),
                       GFP_KERNEL);
        if (edid == NULL) {
                dev_warn(&connector->dev->pdev->dev,
@@ -1195,14 +1195,14 @@ struct edid *drm_get_edid(struct drm_connector *connector,
        if (edid->extensions != 0) {
                int edid_ext_num = edid->extensions;
 
-               if (edid_ext_num > MAX_EDID_EXT_NUM) {
+               if (edid_ext_num > DRM_MAX_EDID_EXT_NUM) {
                        dev_warn(&connector->dev->pdev->dev,
                                 "The number of extension(%d) is "
                                 "over max (%d), actually read number (%d)\n",
-                                edid_ext_num, MAX_EDID_EXT_NUM,
-                                MAX_EDID_EXT_NUM);
+                                edid_ext_num, DRM_MAX_EDID_EXT_NUM,
+                                DRM_MAX_EDID_EXT_NUM);
                        /* Reset EDID extension number to be read */
-                       edid_ext_num = MAX_EDID_EXT_NUM;
+                       edid_ext_num = DRM_MAX_EDID_EXT_NUM;
                }
                /* Read EDID including extensions too */
                ret = drm_ddc_read_edid(connector, adapter, (char *)edid,
@@ -1245,8 +1245,8 @@ bool drm_detect_hdmi_monitor(struct edid *edid)
                goto end;
 
        /* Chose real EDID extension number */
-       edid_ext_num = edid->extensions > MAX_EDID_EXT_NUM ?
-                      MAX_EDID_EXT_NUM : edid->extensions;
+       edid_ext_num = edid->extensions > DRM_MAX_EDID_EXT_NUM ?
+                      DRM_MAX_EDID_EXT_NUM : edid->extensions;
 
        /* Find CEA extension */
        for (i = 0; i < edid_ext_num; i++) {
@@ -1303,7 +1303,7 @@ int drm_add_edid_modes(struct drm_connector *connector, struct edid *edid)
        if (edid == NULL) {
                return 0;
        }
-       if (!edid_is_valid(edid)) {
+       if (!drm_edid_is_valid(edid)) {
                dev_warn(&connector->dev->pdev->dev, "%s: EDID invalid.\n",
                         drm_get_connector_name(connector));
                return 0;

diff --git a/drivers/gpu/drm/radeon/radeon_combios.c b/drivers/gpu/drm/radeon/radeon_combios.c
index e208d73..257ce17 100644 (file)
--- a/drivers/gpu/drm/radeon/radeon_combios.c
+++ b/drivers/gpu/drm/radeon/radeon_combios.c
@@ -443,6 +443,39 @@ static uint16_t combios_get_table_offset(struct drm_device *dev,
 
 }
 
+bool radeon_combios_check_hardcoded_edid(struct radeon_device *rdev)
+{
+       int edid_info;
+       struct edid *edid;
+       edid_info = combios_get_table_offset(rdev->ddev, COMBIOS_HARDCODED_EDID_TABLE);
+       if (!edid_info)
+               return false;
+
+       edid = kmalloc(EDID_LENGTH * (DRM_MAX_EDID_EXT_NUM + 1),
+                      GFP_KERNEL);
+       if (edid == NULL)
+               return false;
+
+       memcpy((unsigned char *)edid,
+              (unsigned char *)(rdev->bios + edid_info), EDID_LENGTH);
+
+       if (!drm_edid_is_valid(edid)) {
+               kfree(edid);
+               return false;
+       }
+
+       rdev->mode_info.bios_hardcoded_edid = edid;
+       return true;
+}
+
+struct edid *
+radeon_combios_get_hardcoded_edid(struct radeon_device *rdev)
+{
+       if (rdev->mode_info.bios_hardcoded_edid)
+               return rdev->mode_info.bios_hardcoded_edid;
+       return NULL;
+}
+
 static struct radeon_i2c_bus_rec combios_setup_i2c_bus(struct radeon_device *rdev,
                                                       int ddc_line)
 {

diff --git a/drivers/gpu/drm/radeon/radeon_display.c b/drivers/gpu/drm/radeon/radeon_display.c
index ec3166b..79634da 100644 (file)
--- a/drivers/gpu/drm/radeon/radeon_display.c
+++ b/drivers/gpu/drm/radeon/radeon_display.c
@@ -352,6 +352,8 @@ static bool radeon_setup_enc_conn(struct drm_device *dev)
 
 int radeon_ddc_get_modes(struct radeon_connector *radeon_connector)
 {
+       struct drm_device *dev = radeon_connector->base.dev;
+       struct radeon_device *rdev = dev->dev_private;
        int ret = 0;
 
        if ((radeon_connector->base.connector_type == DRM_MODE_CONNECTOR_DisplayPort) ||
@@ -366,7 +368,9 @@ 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) {
                drm_mode_connector_update_edid_property(&radeon_connector->base, radeon_connector->edid);
                ret = drm_add_edid_modes(&radeon_connector->base, radeon_connector->edid);
@@ -829,6 +833,12 @@ int radeon_modeset_init(struct radeon_device *rdev)
                return ret;
        }
 
+       /* check combios for a valid hardcoded EDID - Sun servers */
+       if (!rdev->is_atom_bios) {
+               /* check for hardcoded EDID in BIOS */
+               radeon_combios_check_hardcoded_edid(rdev);
+       }
+
        if (rdev->flags & RADEON_SINGLE_CRTC)
                num_crtc = 1;
 
@@ -850,6 +860,8 @@ int radeon_modeset_init(struct radeon_device *rdev)
 
 void radeon_modeset_fini(struct radeon_device *rdev)
 {
+       kfree(rdev->mode_info.bios_hardcoded_edid);
+
        if (rdev->mode_info.mode_config_initialized) {
                radeon_hpd_fini(rdev);
                drm_mode_config_cleanup(rdev->ddev);

diff --git a/drivers/gpu/drm/radeon/radeon_mode.h b/drivers/gpu/drm/radeon/radeon_mode.h
index b884bac..71439ba 100644 (file)
--- a/drivers/gpu/drm/radeon/radeon_mode.h
+++ b/drivers/gpu/drm/radeon/radeon_mode.h
@@ -207,7 +207,8 @@ struct radeon_mode_info {
        struct drm_property *tv_std_property;
        /* legacy TMDS PLL detect */
        struct drm_property *tmds_pll_property;
-
+       /* hardcoded DFP edid from BIOS */
+       struct edid *bios_hardcoded_edid;
 };
 
 #define MAX_H_CODE_TIMING_LEN 32
@@ -479,6 +480,9 @@ extern int radeon_crtc_cursor_set(struct drm_crtc *crtc,
 extern int radeon_crtc_cursor_move(struct drm_crtc *crtc,
                                   int x, int y);
 
+extern bool radeon_combios_check_hardcoded_edid(struct radeon_device *rdev);
+extern struct edid *
+radeon_combios_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 *

diff --git a/include/drm/drm_crtc.h b/include/drm/drm_crtc.h
index fdf43ab..1347524 100644 (file)
--- a/include/drm/drm_crtc.h
+++ b/include/drm/drm_crtc.h
@@ -801,4 +801,6 @@ extern struct drm_display_mode *drm_gtf_mode(struct drm_device *dev,
                                bool interlaced, int margins);
 extern int drm_add_modes_noedid(struct drm_connector *connector,
                                int hdisplay, int vdisplay);
+
+extern bool drm_edid_is_valid(struct edid *edid);
 #endif /* __DRM_CRTC_H__ */

diff --git a/include/drm/drm_edid.h b/include/drm/drm_edid.h
index d33c3e0..b420989 100644 (file)
--- a/include/drm/drm_edid.h
+++ b/include/drm/drm_edid.h
@@ -201,4 +201,7 @@ struct edid {
 
 #define EDID_PRODUCT_ID(e) ((e)->prod_code[0] | ((e)->prod_code[1] << 8))
 
+/* define the number of Extension EDID block */
+#define DRM_MAX_EDID_EXT_NUM 4
+
 #endif /* __DRM_EDID_H__ */