On 2017/10/7 3:21, Liming Sun wrote:
This series of commits enables the multi-card support for the dw-mmc
controller. It includes two parts as below.
The first part (patches 1-7) reverts the series of recent commits that
removed the multi-card support with comments saying there was no such
use case in the real world. Actually this feature is being used in
Mellanox Bluefield SoC and has been requested by customers.
Hrm.... it's so unlucky that your patchset comes a little late. As
your patch 8 and 9 said, you need them to fix problem for multi-card
support, so definitely there was no such use case, and even the code
was buggy to support it right? That makes the code hard to read and
maintain, so we decide to remove it.
The second part (patches 8-9) fixes the DesignWare multi-card support
according to the dw-mmc databook (synnopsys: DesignWare Cores Mobile
Storage Host Databook, 2.70a). It has changes to set the card number
into the CMD register to multiplex requests to different cards when
working in SD_MMC_CEATA mode, set the CTYPE / CLKENA / CDTHRCTL
registers properly according to the spec, and parse the per-card
configuration to match the Linux Documentation
(bindings/mmc/synopsys-dw-mshc.txt).
Havn'e check the databook for details yet, but I think it's ok
to re-introduce multi-slot support if a real user benefits from
it. But you need a new patch to silent the log "num-slots property not
found, assuming 1 slot is available" as we removed all the num-slots
from DT at that time.
Liming Sun (9):
Revert "Documentation: dw-mshc: deprecate num-slots"
Revert "mmc: dw_mmc: remove the unnecessary slot variable"
Revert "mmc: dw_mmc: use the 'slot' instead of 'cur_slot'"
Revert "mmc: dw_mmc: remove the 'id' arguments about functions
relevant to slot"
Revert "mmc: dw_mmc: change the array of slots"
Revert "mmc: dw_mmc: remove the loop about finding slots"
Revert "mmc: dw_mmc: deprecated the "num-slots" property"
mmc: dw_mmc: Support two SD_MMC_CE-ATA cards
mmc: dw_mmc: Parse slot-specific configuration
.../devicetree/bindings/mmc/synopsys-dw-mshc.txt | 16 +-
drivers/mmc/host/dw_mmc-exynos.c | 4 +-
drivers/mmc/host/dw_mmc.c | 277 ++++++++++++++++-----
drivers/mmc/host/dw_mmc.h | 17 +-
4 files changed, 236 insertions(+), 78 deletions(-)
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