On Tue, 16 Apr 2024, Thomas Zimmermann <tzimmermann@xxxxxxx> wrote:
> Hi
>
> Am 16.04.24 um 11:20 schrieb Jani Nikula:
>> Repurpose drm_edid_are_equal() to be more helpful for its single user,
>> and rename drm_edid_eq(). Functionally deduce the length from the blob
>> size, not the blob data, making it more robust against any errors.
>
> Could be squashed into patch 6.
Ack.
Thanks for the review. I'll hold of on resending these until there are
some R-b's... I've send them a few times already with no comments. :(
BR,
Jani.
>
> Best regards
> Thomas
>
>>
>> Signed-off-by: Jani Nikula <jani.nikula@xxxxxxxxx>
>> ---
>> drivers/gpu/drm/drm_edid.c | 41 ++++++++++++++------------------------
>> 1 file changed, 15 insertions(+), 26 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
>> index 463fbad85d90..513590931cc5 100644
>> --- a/drivers/gpu/drm/drm_edid.c
>> +++ b/drivers/gpu/drm/drm_edid.c
>> @@ -1820,30 +1820,20 @@ static bool edid_block_is_zero(const void *edid)
>> return !memchr_inv(edid, 0, EDID_LENGTH);
>> }
>>
>> -/**
>> - * 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.
>> - */
>> -static bool drm_edid_are_equal(const struct edid *edid1, const struct edid *edid2)
>> +static bool drm_edid_eq(const struct drm_edid *drm_edid,
>> + const void *raw_edid, size_t raw_edid_size)
>> {
>> - int edid1_len, edid2_len;
>> - bool edid1_present = edid1 != NULL;
>> - bool edid2_present = edid2 != NULL;
>> + bool edid1_present = drm_edid && drm_edid->edid && drm_edid->size;
>> + bool edid2_present = raw_edid && raw_edid_size;
>>
>> if (edid1_present != edid2_present)
>> return false;
>>
>> - if (edid1) {
>> - edid1_len = edid_size(edid1);
>> - edid2_len = edid_size(edid2);
>> -
>> - if (edid1_len != edid2_len)
>> + if (edid1_present) {
>> + if (drm_edid->size != raw_edid_size)
>> return false;
>>
>> - if (memcmp(edid1, edid2, edid1_len))
>> + if (memcmp(drm_edid->edid, raw_edid, drm_edid->size))
>> return false;
>> }
>>
>> @@ -6936,15 +6926,14 @@ static int _drm_edid_connector_property_update(struct drm_connector *connector,
>> int ret;
>>
>> if (connector->edid_blob_ptr) {
>> - const struct edid *old_edid = connector->edid_blob_ptr->data;
>> -
>> - if (old_edid) {
>> - if (!drm_edid_are_equal(drm_edid ? drm_edid->edid : NULL, old_edid)) {
>> - connector->epoch_counter++;
>> - drm_dbg_kms(dev, "[CONNECTOR:%d:%s] EDID changed, epoch counter %llu\n",
>> - connector->base.id, connector->name,
>> - connector->epoch_counter);
>> - }
>> + const void *old_edid = connector->edid_blob_ptr->data;
>> + size_t old_edid_size = connector->edid_blob_ptr->length;
>> +
>> + if (old_edid && !drm_edid_eq(drm_edid, old_edid, old_edid_size)) {
>> + connector->epoch_counter++;
>> + drm_dbg_kms(dev, "[CONNECTOR:%d:%s] EDID changed, epoch counter %llu\n",
>> + connector->base.id, connector->name,
>> + connector->epoch_counter);
>> }
>> }
>>
--
Jani Nikula, Intel
