[PATCH 12/15] drm/edid: use struct drm_edid for override/firmware EDID
Jani Nikula
jani.nikula at intel.com
Tue Oct 11 13:49:46 UTC 2022
There's a lot going on here, but the main thing is switching the
firmware EDID loader to use struct drm_edid. Unfortunately, it's
difficult to reasonably split to smaller pieces.
Convert the EDID loader to struct drm_edid. There's a functional change
in validation; it no longer tries to fix errors or filter invalid
blocks. It's stricter in this sense. Hopefully this will not be an
issue.
As a by-product, this change also allows HF-EEODB extended EDIDs to be
passed via override/firmware EDID.
Signed-off-by: Jani Nikula <jani.nikula at intel.com>
---
drivers/gpu/drm/drm_edid.c | 32 ++++++------
drivers/gpu/drm/drm_edid_load.c | 86 +++++++--------------------------
include/drm/drm_edid.h | 4 +-
3 files changed, 36 insertions(+), 86 deletions(-)
diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
index 2c66a901474d..935bdf4e6269 100644
--- a/drivers/gpu/drm/drm_edid.c
+++ b/drivers/gpu/drm/drm_edid.c
@@ -2202,21 +2202,16 @@ static void connector_bad_edid(struct drm_connector *connector,
}
/* Get override or firmware EDID */
-static struct edid *drm_get_override_edid(struct drm_connector *connector,
- size_t *alloc_size)
+static const struct drm_edid *drm_edid_override_get(struct drm_connector *connector)
{
- struct edid *override = NULL;
+ const struct drm_edid *override = NULL;
if (connector->edid_override)
- override = drm_edid_duplicate(connector->edid_override->edid);
+ override = drm_edid_dup(connector->edid_override);
if (!override)
override = drm_edid_load_firmware(connector);
- /* FIXME: Get alloc size from deeper down the stack */
- if (!IS_ERR_OR_NULL(override) && alloc_size)
- *alloc_size = edid_size(override);
-
return IS_ERR(override) ? NULL : override;
}
@@ -2277,14 +2272,14 @@ int drm_edid_override_reset(struct drm_connector *connector)
*/
int drm_edid_override_connector_update(struct drm_connector *connector)
{
- struct edid *override;
+ const struct drm_edid *override;
int num_modes = 0;
- override = drm_get_override_edid(connector, NULL);
+ override = drm_edid_override_get(connector);
if (override) {
- drm_connector_update_edid_property(connector, override);
- num_modes = drm_add_edid_modes(connector, override);
- kfree(override);
+ num_modes = drm_edid_connector_update(connector, override);
+
+ drm_edid_free(override);
DRM_DEBUG_KMS("[CONNECTOR:%d:%s] adding %d modes via fallback override/firmware EDID\n",
connector->base.id, connector->name, num_modes);
@@ -2335,12 +2330,19 @@ static struct edid *_drm_do_get_edid(struct drm_connector *connector,
{
enum edid_block_status status;
int i, num_blocks, invalid_blocks = 0;
+ const struct drm_edid *override;
struct edid *edid, *new;
size_t alloc_size = EDID_LENGTH;
- edid = drm_get_override_edid(connector, &alloc_size);
- if (edid)
+ override = drm_edid_override_get(connector);
+ if (override) {
+ alloc_size = override->size;
+ edid = kmemdup(override->edid, alloc_size, GFP_KERNEL);
+ drm_edid_free(override);
+ if (!edid)
+ return NULL;
goto ok;
+ }
edid = kmalloc(alloc_size, GFP_KERNEL);
if (!edid)
diff --git a/drivers/gpu/drm/drm_edid_load.c b/drivers/gpu/drm/drm_edid_load.c
index bc6b96abd1b3..248f0685c33e 100644
--- a/drivers/gpu/drm/drm_edid_load.c
+++ b/drivers/gpu/drm/drm_edid_load.c
@@ -159,22 +159,12 @@ static const u8 generic_edid[GENERIC_EDIDS][128] = {
},
};
-static int edid_size(const u8 *edid, int data_size)
-{
- if (data_size < EDID_LENGTH)
- return 0;
-
- return (edid[0x7e] + 1) * EDID_LENGTH;
-}
-
-static void *edid_load(struct drm_connector *connector, const char *name)
+static const struct drm_edid *edid_load(struct drm_connector *connector, const char *name)
{
const struct firmware *fw = NULL;
const u8 *fwdata;
- u8 *edid;
+ const struct drm_edid *drm_edid;
int fwsize, builtin;
- int i, valid_extensions = 0;
- bool print_bad_edid = !connector->bad_edid_counter || drm_debug_enabled(DRM_UT_KMS);
builtin = match_string(generic_edid_name, GENERIC_EDIDS, name);
if (builtin >= 0) {
@@ -203,69 +193,26 @@ static void *edid_load(struct drm_connector *connector, const char *name)
fwsize = fw->size;
}
- if (edid_size(fwdata, fwsize) != fwsize) {
- DRM_ERROR("Size of EDID firmware \"%s\" is invalid "
- "(expected %d, got %d\n", name,
- edid_size(fwdata, fwsize), (int)fwsize);
- edid = ERR_PTR(-EINVAL);
- goto out;
- }
-
- edid = kmemdup(fwdata, fwsize, GFP_KERNEL);
- if (edid == NULL) {
- edid = ERR_PTR(-ENOMEM);
- goto out;
- }
-
- if (!drm_edid_block_valid(edid, 0, print_bad_edid,
- &connector->edid_corrupt)) {
- connector->bad_edid_counter++;
- DRM_ERROR("Base block of EDID firmware \"%s\" is invalid ",
- name);
- kfree(edid);
- edid = ERR_PTR(-EINVAL);
- goto out;
- }
-
- for (i = 1; i <= edid[0x7e]; i++) {
- if (i != valid_extensions + 1)
- memcpy(edid + (valid_extensions + 1) * EDID_LENGTH,
- edid + i * EDID_LENGTH, EDID_LENGTH);
- if (drm_edid_block_valid(edid + i * EDID_LENGTH, i,
- print_bad_edid,
- NULL))
- valid_extensions++;
- }
-
- if (valid_extensions != edid[0x7e]) {
- u8 *new_edid;
+ drm_dbg_kms(connector->dev, "[CONNECTOR:%d:%s] Loaded %s firmware EDID \"%s\"\n",
+ connector->base.id, connector->name,
+ builtin >= 0 ? "built-in" : "external", name);
- edid[EDID_LENGTH-1] += edid[0x7e] - valid_extensions;
- DRM_INFO("Found %d valid extensions instead of %d in EDID data "
- "\"%s\" for connector \"%s\"\n", valid_extensions,
- edid[0x7e], name, connector->name);
- edid[0x7e] = valid_extensions;
-
- new_edid = krealloc(edid, (valid_extensions + 1) * EDID_LENGTH,
- GFP_KERNEL);
- if (new_edid)
- edid = new_edid;
+ drm_edid = drm_edid_alloc(fwdata, fwsize);
+ if (!drm_edid_valid(drm_edid)) {
+ drm_err(connector->dev, "Invalid firmware EDID \"%s\"\n", name);
+ drm_edid_free(drm_edid);
+ drm_edid = ERR_PTR(-EINVAL);
}
- DRM_INFO("Got %s EDID base block and %d extension%s from "
- "\"%s\" for connector \"%s\"\n", (builtin >= 0) ? "built-in" :
- "external", valid_extensions, valid_extensions == 1 ? "" : "s",
- name, connector->name);
-
-out:
release_firmware(fw);
- return edid;
+
+ return drm_edid;
}
-struct edid *drm_edid_load_firmware(struct drm_connector *connector)
+const struct drm_edid *drm_edid_load_firmware(struct drm_connector *connector)
{
char *edidname, *last, *colon, *fwstr, *edidstr, *fallback = NULL;
- struct edid *edid;
+ const struct drm_edid *drm_edid;
if (edid_firmware[0] == '\0')
return ERR_PTR(-ENOENT);
@@ -308,8 +255,9 @@ struct edid *drm_edid_load_firmware(struct drm_connector *connector)
if (*last == '\n')
*last = '\0';
- edid = edid_load(connector, edidname);
+ drm_edid = edid_load(connector, edidname);
+
kfree(fwstr);
- return edid;
+ return drm_edid;
}
diff --git a/include/drm/drm_edid.h b/include/drm/drm_edid.h
index dc7467d25cd8..8138613f4e4e 100644
--- a/include/drm/drm_edid.h
+++ b/include/drm/drm_edid.h
@@ -388,11 +388,11 @@ int drm_av_sync_delay(struct drm_connector *connector,
const struct drm_display_mode *mode);
#ifdef CONFIG_DRM_LOAD_EDID_FIRMWARE
-struct edid *drm_edid_load_firmware(struct drm_connector *connector);
+const struct drm_edid *drm_edid_load_firmware(struct drm_connector *connector);
int __drm_set_edid_firmware_path(const char *path);
int __drm_get_edid_firmware_path(char *buf, size_t bufsize);
#else
-static inline struct edid *
+static inline const struct drm_edid *
drm_edid_load_firmware(struct drm_connector *connector)
{
return ERR_PTR(-ENOENT);
--
2.34.1
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