[PATCH v4 0/7] mmc: sdhci controllers: Fix SDHCI_RESET_ALL for CQHCI

[Brian Norris]

This is a series of identical fixes for several SDHCI host
drivers. Patch #2 (for sdhci-of-arasan; plus its dependency in patch #1)
is the only one I've tested, and I wrote it due to a bug described
there.

I then noticed that several other drivers do the same thing, and that
commit df57d73276b8 ("mmc: sdhci-pci: Fix SDHCI_RESET_ALL for CQHCI for
Intel GLK-based controllers") points out the likely-repeated bug. So the
fix is now factored into a separate sdhci_and_cqhci_reset() helper,
and it's likely that most/all drivers that support a combo SDHCI/CQHCI
controller will want to use it.

Thus, I include additional patches (compile-tested only) that apply this
helper/fix to the other drivers which call cqhci_init() but not
cqhci_deactivate(). They contain appropriate disclaimers and the
relevant parties are CC'd. I would suggest only merging them if you get
some kind of ACK from people familiar with the relevant hardware.

Notably, I do *not* patch drivers/mmc/host/mtk-sd.c although it uses
CQHCI, because it doesn't seem to be an SDHCI-based controller, and so
even if it has a similar bug, it's not clear to me how to patch it.

- Brian

Changes in v4:
 - Improve for-stable cherry-picking notes
 - Add Adrian's Ack
 - Also fix sdhci_am654_ops, sdhci_j721e_8bit_ops

Changes in v3:
 - Refactor to a "SDHCI and CQHCI" helper -- sdhci_and_cqhci_reset()

Changes in v2:
 - Rely on cqhci_deactivate() to safely handle (ignore)
   not-yet-initialized CQE support

Brian Norris (7):
  mmc: cqhci: Provide helper for resetting both SDHCI and CQHCI
  mmc: sdhci-of-arasan: Fix SDHCI_RESET_ALL for CQHCI
  mmc: sdhci-brcmstb: Fix SDHCI_RESET_ALL for CQHCI
  mms: sdhci-esdhc-imx: Fix SDHCI_RESET_ALL for CQHCI
  mmc: sdhci-tegra: Fix SDHCI_RESET_ALL for CQHCI
  mmc: sdhci_am654: Fix SDHCI_RESET_ALL for CQHCI
  mmc: sdhci-*: Convert drivers to new sdhci_and_cqhci_reset()

 drivers/mmc/host/sdhci-brcmstb.c   |  3 ++-
 drivers/mmc/host/sdhci-cqhci.h     | 24 ++++++++++++++++++++++++
 drivers/mmc/host/sdhci-esdhc-imx.c |  3 ++-
 drivers/mmc/host/sdhci-msm.c       | 10 ++--------
 drivers/mmc/host/sdhci-of-arasan.c |  3 ++-
 drivers/mmc/host/sdhci-pci-core.c  | 11 ++---------
 drivers/mmc/host/sdhci-pci-gli.c   | 11 ++---------
 drivers/mmc/host/sdhci-tegra.c     |  3 ++-
 drivers/mmc/host/sdhci_am654.c     |  7 ++++---
 9 files changed, 42 insertions(+), 33 deletions(-)
 create mode 100644 drivers/mmc/host/sdhci-cqhci.h

-- 
2.38.0.135.g90850a2211-goog