Hi Ulf,
On 05-04-18 22:19, Ulf Hansson wrote:
It's rather common that SDIO func devices becomes loaded with a new firmware as
a part of the SDIO func driver being probed. However, in some special scenarios
the SDIO func device needs a SW reset, as to start running the new firmware.
More importantly, a full power cycle doesn't work, as that would reset also the
firmware, thus the existing mmc_hw_reset() API can't be used to deal with these
scenarios.
Therefore this series suggest to add a new API, mmc_sw_reset(), which resets
and re-initialize the SDIO card. A couple of the patches in the series are
mostly re-factorings making generic improvements to the related code.
For more background to this series, feel free to digest the discussions from
the submitted patch: https://patchwork.kernel.org/patch/9857175/
It should be noted, at this point this series has only be compile tested. Help
with tests and deployment of using the new API is greatly appreciated.
Thank you for this series, I've taken a quick look and it looks good,
but the proof is in the pudding. Quentin can you test this on an ARM
board with an ESP8089 sometime the coming week?
Regards,
Hans
Kind regards
Ulf Hansson
Ulf Hansson (5):
mmc: core: Re-factor some code for SDIO re-initialization
mmc: core: Rename ->reset() bus ops to ->hw_reset()
mmc: core: Export a function mmc_sw_reset() to allow soft reset of
cards
mmc: core: Share internal function to set initial signal voltage
mmc: core: Implement ->sw_reset bus ops for SDIO
drivers/mmc/core/core.c | 49 +++++++++++++++++++++++++++++++++---------
drivers/mmc/core/core.h | 4 +++-
drivers/mmc/core/mmc.c | 4 ++--
drivers/mmc/core/sd.c | 4 ++--
drivers/mmc/core/sdio.c | 56 +++++++++++++++++++++++++++++-------------------
include/linux/mmc/core.h | 1 +
6 files changed, 81 insertions(+), 37 deletions(-)
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