cam_fill_mmcio: initialize cmd.error sub-fieldstable/13

For me, this fixes a problem with using eMMC storage in MMCCAM
configuration with dwmmc driver (on Rock64).
The problem appeared after commit 07da3bb5d56c85 "mmc: support for SPI
bus type".

The problem was caused by the said commit changing the layout of struct
mmc_ios which is embedded into struct ccb_trans_settings_mmc with the
latter being embedded into struct ccb_trans_settings, a member of
union ccb.

The layout mattered for two reasons:
1. dwmmc sets cmd.error only in case of an error;
2. mmc_da's sdda_start_init uses the same ccb for different transaction
   types without explicitly clearing the object between transactions.

As a result, cmd.error could start out with a non-zero value and dwmmc
would keep that value which would then be interpreted as a failure.
Such a failure happened in mmc_set_timing resulting in incorrect timing
settings and subsequent complete failure to communicate with the eMMC
module.

Reviewed by:	pkelsey

(cherry picked from commit 10db2ad8614adc544292856c693503ca8e9c9fd9)

0 files changed, 0 insertions, 0 deletions