> 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 <[email protected]>
LGTM: Reviewed-by: Peng Fan <[email protected]>
