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path: root/drivers/gpu/drm/drm_edid.c
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Diffstat (limited to 'drivers/gpu/drm/drm_edid.c')
-rw-r--r--drivers/gpu/drm/drm_edid.c171
1 files changed, 38 insertions, 133 deletions
diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
index c2bbe7bee7b6..81d5f2524246 100644
--- a/drivers/gpu/drm/drm_edid.c
+++ b/drivers/gpu/drm/drm_edid.c
@@ -1585,8 +1585,6 @@ module_param_named(edid_fixup, edid_fixup, int, 0400);
MODULE_PARM_DESC(edid_fixup,
"Minimum number of valid EDID header bytes (0-8, default 6)");
-static int validate_displayid(u8 *displayid, int length, int idx);
-
static int drm_edid_block_checksum(const u8 *raw_edid)
{
int i;
@@ -3241,10 +3239,10 @@ add_detailed_modes(struct drm_connector *connector, struct edid *edid,
/*
* Search EDID for CEA extension block.
*/
-static u8 *drm_find_edid_extension(const struct edid *edid,
- int ext_id, int *ext_index)
+const u8 *drm_find_edid_extension(const struct edid *edid,
+ int ext_id, int *ext_index)
{
- u8 *edid_ext = NULL;
+ const u8 *edid_ext = NULL;
int i;
/* No EDID or EDID extensions */
@@ -3253,7 +3251,7 @@ static u8 *drm_find_edid_extension(const struct edid *edid,
/* Find CEA extension */
for (i = *ext_index; i < edid->extensions; i++) {
- edid_ext = (u8 *)edid + EDID_LENGTH * (i + 1);
+ edid_ext = (const u8 *)edid + EDID_LENGTH * (i + 1);
if (edid_ext[0] == ext_id)
break;
}
@@ -3266,63 +3264,30 @@ static u8 *drm_find_edid_extension(const struct edid *edid,
return edid_ext;
}
-
-static u8 *drm_find_displayid_extension(const struct edid *edid,
- int *length, int *idx,
- int *ext_index)
+static const u8 *drm_find_cea_extension(const struct edid *edid)
{
- u8 *displayid = drm_find_edid_extension(edid, DISPLAYID_EXT, ext_index);
- struct displayid_hdr *base;
- int ret;
-
- if (!displayid)
- return NULL;
-
- /* EDID extensions block checksum isn't for us */
- *length = EDID_LENGTH - 1;
- *idx = 1;
-
- ret = validate_displayid(displayid, *length, *idx);
- if (ret)
- return NULL;
-
- base = (struct displayid_hdr *)&displayid[*idx];
- *length = *idx + sizeof(*base) + base->bytes;
-
- return displayid;
-}
-
-static u8 *drm_find_cea_extension(const struct edid *edid)
-{
- int length, idx;
- struct displayid_block *block;
- u8 *cea;
- u8 *displayid;
- int ext_index;
+ const struct displayid_block *block;
+ struct displayid_iter iter;
+ const u8 *cea;
+ int ext_index = 0;
/* Look for a top level CEA extension block */
/* FIXME: make callers iterate through multiple CEA ext blocks? */
- ext_index = 0;
cea = drm_find_edid_extension(edid, CEA_EXT, &ext_index);
if (cea)
return cea;
/* CEA blocks can also be found embedded in a DisplayID block */
- ext_index = 0;
- for (;;) {
- displayid = drm_find_displayid_extension(edid, &length, &idx,
- &ext_index);
- if (!displayid)
- return NULL;
-
- idx += sizeof(struct displayid_hdr);
- for_each_displayid_db(displayid, block, idx, length) {
- if (block->tag == DATA_BLOCK_CTA)
- return (u8 *)block;
+ displayid_iter_edid_begin(edid, &iter);
+ displayid_iter_for_each(block, &iter) {
+ if (block->tag == DATA_BLOCK_CTA) {
+ cea = (const u8 *)block;
+ break;
}
}
+ displayid_iter_end(&iter);
- return NULL;
+ return cea;
}
static __always_inline const struct drm_display_mode *cea_mode_for_vic(u8 vic)
@@ -4503,8 +4468,8 @@ static void clear_eld(struct drm_connector *connector)
static void drm_edid_to_eld(struct drm_connector *connector, struct edid *edid)
{
uint8_t *eld = connector->eld;
- u8 *cea;
- u8 *db;
+ const u8 *cea;
+ const u8 *db;
int total_sad_count = 0;
int mnl;
int dbl;
@@ -4600,7 +4565,7 @@ int drm_edid_to_sad(struct edid *edid, struct cea_sad **sads)
{
int count = 0;
int i, start, end, dbl;
- u8 *cea;
+ const u8 *cea;
cea = drm_find_cea_extension(edid);
if (!cea) {
@@ -4619,7 +4584,7 @@ int drm_edid_to_sad(struct edid *edid, struct cea_sad **sads)
}
for_each_cea_db(cea, i, start, end) {
- u8 *db = &cea[i];
+ const u8 *db = &cea[i];
if (cea_db_tag(db) == AUDIO_BLOCK) {
int j;
@@ -4631,7 +4596,7 @@ int drm_edid_to_sad(struct edid *edid, struct cea_sad **sads)
if (!*sads)
return -ENOMEM;
for (j = 0; j < count; j++) {
- u8 *sad = &db[1 + j * 3];
+ const u8 *sad = &db[1 + j * 3];
(*sads)[j].format = (sad[0] & 0x78) >> 3;
(*sads)[j].channels = sad[0] & 0x7;
@@ -4755,7 +4720,7 @@ EXPORT_SYMBOL(drm_av_sync_delay);
*/
bool drm_detect_hdmi_monitor(struct edid *edid)
{
- u8 *edid_ext;
+ const u8 *edid_ext;
int i;
int start_offset, end_offset;
@@ -4793,7 +4758,7 @@ EXPORT_SYMBOL(drm_detect_hdmi_monitor);
*/
bool drm_detect_monitor_audio(struct edid *edid)
{
- u8 *edid_ext;
+ const u8 *edid_ext;
int i, j;
bool has_audio = false;
int start_offset, end_offset;
@@ -5287,32 +5252,6 @@ u32 drm_add_display_info(struct drm_connector *connector, const struct edid *edi
return quirks;
}
-static int validate_displayid(u8 *displayid, int length, int idx)
-{
- int i, dispid_length;
- u8 csum = 0;
- struct displayid_hdr *base;
-
- base = (struct displayid_hdr *)&displayid[idx];
-
- DRM_DEBUG_KMS("base revision 0x%x, length %d, %d %d\n",
- base->rev, base->bytes, base->prod_id, base->ext_count);
-
- /* +1 for DispID checksum */
- dispid_length = sizeof(*base) + base->bytes + 1;
- if (dispid_length > length - idx)
- return -EINVAL;
-
- for (i = 0; i < dispid_length; i++)
- csum += displayid[idx + i];
- if (csum) {
- DRM_NOTE("DisplayID checksum invalid, remainder is %d\n", csum);
- return -EINVAL;
- }
-
- return 0;
-}
-
static struct drm_display_mode *drm_mode_displayid_detailed(struct drm_device *dev,
struct displayid_detailed_timings_1 *timings)
{
@@ -5359,7 +5298,7 @@ static struct drm_display_mode *drm_mode_displayid_detailed(struct drm_device *d
}
static int add_displayid_detailed_1_modes(struct drm_connector *connector,
- struct displayid_block *block)
+ const struct displayid_block *block)
{
struct displayid_detailed_timing_block *det = (struct displayid_detailed_timing_block *)block;
int i;
@@ -5387,27 +5326,16 @@ static int add_displayid_detailed_1_modes(struct drm_connector *connector,
static int add_displayid_detailed_modes(struct drm_connector *connector,
struct edid *edid)
{
- u8 *displayid;
- int length, idx;
- struct displayid_block *block;
+ const struct displayid_block *block;
+ struct displayid_iter iter;
int num_modes = 0;
- int ext_index = 0;
- for (;;) {
- displayid = drm_find_displayid_extension(edid, &length, &idx,
- &ext_index);
- if (!displayid)
- break;
-
- idx += sizeof(struct displayid_hdr);
- for_each_displayid_db(displayid, block, idx, length) {
- switch (block->tag) {
- case DATA_BLOCK_TYPE_1_DETAILED_TIMING:
- num_modes += add_displayid_detailed_1_modes(connector, block);
- break;
- }
- }
+ displayid_iter_edid_begin(edid, &iter);
+ displayid_iter_for_each(block, &iter) {
+ if (block->tag == DATA_BLOCK_TYPE_1_DETAILED_TIMING)
+ num_modes += add_displayid_detailed_1_modes(connector, block);
}
+ displayid_iter_end(&iter);
return num_modes;
}
@@ -6041,43 +5969,20 @@ static void drm_parse_tiled_block(struct drm_connector *connector,
}
}
-static void drm_displayid_parse_tiled(struct drm_connector *connector,
- const u8 *displayid, int length, int idx)
-{
- const struct displayid_block *block;
-
- idx += sizeof(struct displayid_hdr);
- for_each_displayid_db(displayid, block, idx, length) {
- DRM_DEBUG_KMS("block id 0x%x, rev %d, len %d\n",
- block->tag, block->rev, block->num_bytes);
-
- switch (block->tag) {
- case DATA_BLOCK_TILED_DISPLAY:
- drm_parse_tiled_block(connector, block);
- break;
- default:
- DRM_DEBUG_KMS("found DisplayID tag 0x%x, unhandled\n", block->tag);
- break;
- }
- }
-}
-
void drm_update_tile_info(struct drm_connector *connector,
const struct edid *edid)
{
- const void *displayid = NULL;
- int ext_index = 0;
- int length, idx;
+ const struct displayid_block *block;
+ struct displayid_iter iter;
connector->has_tile = false;
- for (;;) {
- displayid = drm_find_displayid_extension(edid, &length, &idx,
- &ext_index);
- if (!displayid)
- break;
- drm_displayid_parse_tiled(connector, displayid, length, idx);
+ displayid_iter_edid_begin(edid, &iter);
+ displayid_iter_for_each(block, &iter) {
+ if (block->tag == DATA_BLOCK_TILED_DISPLAY)
+ drm_parse_tiled_block(connector, block);
}
+ displayid_iter_end(&iter);
if (!connector->has_tile && connector->tile_group) {
drm_mode_put_tile_group(connector->dev, connector->tile_group);
generated by cgit v1.2.3 (git 2.39.0) at 2025-10-31 14:55:22 +0300