It exposes generic interface from drm_edid.c to get the edid data and length
by any display entity. Once I get clear idea about edid handling in CDF, I need
to revert these temporary changes.
Signed-off-by: Rahul Sharma <rahul.sharma@xxxxxxxxxxx>
---
drivers/gpu/drm/drm_edid.c | 88 ++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 88 insertions(+)
diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
index 5a3770f..567a565 100644
--- a/drivers/gpu/drm/drm_edid.c
+++ b/drivers/gpu/drm/drm_edid.c
@@ -31,6 +31,7 @@
#include <linux/slab.h>
#include <linux/i2c.h>
#include <linux/module.h>
+#include <video/display.h>
#include <drm/drmP.h>
#include <drm/drm_edid.h>
#include "drm_edid_modes.h"
@@ -386,6 +387,93 @@ out:
return NULL;
}
+int generic_drm_do_get_edid(struct i2c_adapter *adapter,
+ struct display_entity_edid *edid)
+{
+ int i, j = 0, valid_extensions = 0;
+ u8 *block, *new;
+ bool print_bad_edid = 0;
+
+ block = kmalloc(EDID_LENGTH, GFP_KERNEL);
+ if (!block)
+ return -ENOMEM;
+
+ /* base block fetch */
+ for (i = 0; i < 4; i++) {
+ if (drm_do_probe_ddc_edid(adapter, block, 0, EDID_LENGTH))
+ goto out;
+ if (drm_edid_block_valid(block, 0, print_bad_edid))
+ break;
+ if (i == 0 && drm_edid_is_zero(block, EDID_LENGTH))
+ goto carp;
+ }
+ if (i == 4)
+ goto carp;
+
+ /* if there's no extensions, we're done */
+ if (block[0x7e] == 0) {
+ edid->edid = block;
+ edid->len = EDID_LENGTH;
+ return 0;
+ }
+
+ new = krealloc(block, (block[0x7e] + 1) * EDID_LENGTH, GFP_KERNEL);
+ if (!new)
+ goto out;
+ block = new;
+ edid->len = (block[0x7e] + 1) * EDID_LENGTH;
+
+ for (j = 1; j <= block[0x7e]; j++) {
+ for (i = 0; i < 4; i++) {
+ if (drm_do_probe_ddc_edid(adapter,
+ block + (valid_extensions + 1) * EDID_LENGTH,
+ j, EDID_LENGTH))
+ goto out;
+ if (drm_edid_block_valid(block + (valid_extensions + 1)*
+ EDID_LENGTH, j, print_bad_edid)) {
+ valid_extensions++;
+ break;
+ }
+ }
+ if (i == 4)
+ DRM_DEBUG_KMS("Ignoring inv lock %d.\n", j);
+ }
+
+ if (valid_extensions != block[0x7e]) {
+ block[EDID_LENGTH-1] += block[0x7e] - valid_extensions;
+ block[0x7e] = valid_extensions;
+ new = krealloc(block, (valid_extensions + 1)*
+ EDID_LENGTH, GFP_KERNEL);
+ if (!new)
+ goto out;
+ block = new;
+ edid->len = (valid_extensions + 1) * EDID_LENGTH;
+ }
+
+ edid->edid = block;
+ return 0;
+
+carp:
+ if (print_bad_edid)
+ DRM_DEBUG_KMS("[ERROR]: EDID block %d invalid.\n", j);
+
+out:
+ kfree(block);
+ return -ENOMEM;
+}
+
+
+int generic_drm_get_edid(struct i2c_adapter *adapter,
+ struct display_entity_edid *edid)
+{
+ int ret = -EINVAL;
+ if (drm_probe_ddc(adapter))
+ ret = generic_drm_do_get_edid(adapter, edid);
+
+ return ret;
+}
+EXPORT_SYMBOL(generic_drm_get_edid);
+
/**
* Probe DDC presence.
*
--
1.8.0
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