The commit 0252924ac6d4 ("mmc: dw_mmc: Extract FIFO data transfer into a
separate routine") unintentionally changed behavior of the FIFO data
transfer routine.
When data is read and size reaches 0 the original loop would wait on
DWMCI_INTMSK_DTO or timeout. The remaining size to read and buf position
is no longer tracked across dwmci_data_transfer_fifo() calls and because
of this an extra call to fifo() and dwmci_fifo_ready() may now trigger a
FIFO underflow timeout error and slows down FIFO reading.
Buswidth = 4, clock: 50000000
Sending CMD16
Sending CMD17
dwmci_fifo_ready: FIFO underflow timeout
Sending CMD16
Sending CMD18
dwmci_fifo_ready: FIFO underflow timeout
Sending CMD12
## Checking hash(es) for config config-1 ... OK
This reverts commit 0252924ac6d4af69061bb9589d16b30c5bdb7178 to restore
the old working behavior.
Fixes: 0252924ac6d4 ("mmc: dw_mmc: Extract FIFO data transfer into a separate routine")
Signed-off-by: Jonas Karlman <jonas@kwiboo.se>
Tested-by: Quentin Schulz <quentin.schulz@cherry.de> # RK3588 Tiger
Reviewed-by: Simon Glass <sjg@chromium.org>
bbfa4587b5