Subject: [PATCH] mmc: dw_mmc: Fix FIFO data transfer timeout
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 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.
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
Restore old behavior and track remaining size to read across calls to fix this.
Fixes: 0252924ac6d4 ("mmc: dw_mmc: Extract FIFO data transfer into a separate routine") Signed-off-by: Jonas Karlman jonas@kwiboo.se
LGTM: Reviewed-by: Peng Fan peng.fan@nxp.com