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drm/edid: track invalid blocks in drm_do_get_edid() 

Track invalid blocks instead of valid extensions to minimize impact on
the happy day scenario, and hide the details in the separate function.

Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/6215f85b01c579a44c66129d2b5f41e1ab9294de.1648752228.git.jani.nikula@intel.com
This commit is contained in:
Jani Nikula 2022-03-31 21:45:08 +03:00
parent 4ec53461d6
commit ccc97def44
1 changed files with 8 additions and 9 deletions
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17
drivers/gpu/drm/drm_edid.c
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@ -1824,9 +1824,10 @@ bool drm_edid_is_valid(struct edid *edid)
EXPORT_SYMBOL(drm_edid_is_valid);
static struct edid *edid_filter_invalid_blocks(const struct edid *edid,
int valid_extensions)
int invalid_blocks)
{
struct edid *new, *dest_block;
int valid_extensions = edid->extensions - invalid_blocks;
int i;
new = kmalloc_array(valid_extensions + 1, EDID_LENGTH, GFP_KERNEL);
@ -2062,7 +2063,7 @@ struct edid *drm_do_get_edid(struct drm_connector *connector,
size_t len),
void *data)
{
int j, valid_extensions = 0;
int j, invalid_blocks = 0;
struct edid *edid, *new, *override;
override = drm_get_override_edid(connector);
@ -2073,12 +2074,10 @@ struct edid *drm_do_get_edid(struct drm_connector *connector,
if (!edid)
return NULL;
/* if there's no extensions or no connector, we're done */
valid_extensions = edid->extensions;
if (valid_extensions == 0)
if (edid->extensions == 0)
return edid;
new = krealloc(edid, (valid_extensions + 1) * EDID_LENGTH, GFP_KERNEL);
new = krealloc(edid, (edid->extensions + 1) * EDID_LENGTH, GFP_KERNEL);
if (!new)
goto out;
edid = new;
@ -2095,13 +2094,13 @@ struct edid *drm_do_get_edid(struct drm_connector *connector,
}
if (try == 4)
valid_extensions--;
invalid_blocks++;
}
if (valid_extensions != edid->extensions) {
if (invalid_blocks) {
connector_bad_edid(connector, (u8 *)edid, edid->extensions + 1);
edid = edid_filter_invalid_blocks(edid, valid_extensions);
edid = edid_filter_invalid_blocks(edid, invalid_blocks);
}
return edid;