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drm: Add helper to compare edids.

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Many drivers would benefit from using
drm helper to compare edid, rather
than bothering with own implementation.

v2: Added documentation for this function.

Signed-off-by: Stanislav Lisovskiy <stanislav.lisovskiy@intel.com>
Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200630002700.5451-2-kunal1.joshi@intel.com
This commit is contained in:
Stanislav Lisovskiy 2020-06-30 05:56:58 +05:30 committed by Maarten Lankhorst
parent e9d636ab77
commit 536faa450e
2 changed files with 42 additions and 0 deletions
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33
drivers/gpu/drm/drm_edid.c
View file

@ -1615,6 +1615,39 @@ static bool drm_edid_is_zero(const u8 *in_edid, int length)
return true;
}
/**
* drm_edid_are_equal - compare two edid blobs.
* @edid1: pointer to first blob
* @edid2: pointer to second blob
* This helper can be used during probing to determine if
* edid had changed.
*/
bool drm_edid_are_equal(const struct edid *edid1, const struct edid *edid2)
{
int edid1_len, edid2_len;
bool edid1_present = edid1 != NULL;
bool edid2_present = edid2 != NULL;
if (edid1_present != edid2_present)
return false;
if (edid1) {
edid1_len = EDID_LENGTH * (1 + edid1->extensions);
edid2_len = EDID_LENGTH * (1 + edid2->extensions);
if (edid1_len != edid2_len)
return false;
if (memcmp(edid1, edid2, edid1_len))
return false;
}
return true;
}
EXPORT_SYMBOL(drm_edid_are_equal);
/**
* drm_edid_block_valid - Sanity check the EDID block (base or extension)
* @raw_edid: pointer to raw EDID block

9
include/drm/drm_edid.h
View file

@ -359,6 +359,15 @@ drm_load_edid_firmware(struct drm_connector *connector)
}
#endif
/**
* drm_edid_are_equal - compare two edid blobs.
* @edid1: pointer to first blob
* @edid2: pointer to second blob
* This helper can be used during probing to determine if
* edid had changed.
*/
bool drm_edid_are_equal(const struct edid *edid1, const struct edid *edid2);
int
drm_hdmi_avi_infoframe_from_display_mode(struct hdmi_avi_infoframe *frame,
const struct drm_connector *connector,