We (==I) have no way of acting on a "calibration request". If your experimental results show that this model needs to have its own profiling parameters (and what they should be), please submit a patch to that effect.
Canon multiraster: final complete block is not written
Committed as 79d9332ced.
canon: Incomplete final data block might not be written (Alexander Hübscher)
Canon: density adjustments use subchannel count instead of index
Thank you for the fix. FYI, a multi-page report for a one-line code change is ridiculous.
canon: subchannel density adjustments were not correctly applied (Alexander Hübscher)
run 'lpoptions -d DP-DS620 -l' to get a list of all legal options the printer accepts. Notably, 'media' is not among them, but 'PageSize' is.