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mmc: sdhci-of-arasan: Fix SDHCI_RESET_ALL for CQHCI
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SDHCI_RESET_ALL resets will reset the hardware CQE state, but we aren't
tracking that properly in software. When out of sync, we may trigger
various timeouts.

It's not typical to perform resets while CQE is enabled, but one
particular case I hit commonly enough: mmc_suspend() -> mmc_power_off().
Typically we will eventually deactivate CQE (cqhci_suspend() ->
cqhci_deactivate()), but that's not guaranteed -- in particular, if
we perform a partial (e.g., interrupted) system suspend.

The same bug was already found and fixed for two other drivers, in v5.7
and v5.9:

  5cf583f ("mmc: sdhci-msm: Deactivate CQE during SDHC reset")
  df57d73 ("mmc: sdhci-pci: Fix SDHCI_RESET_ALL for CQHCI for Intel
                 GLK-based controllers")

The latter is especially prescient, saying "other drivers using CQHCI
might benefit from a similar change, if they also have CQHCI reset by
SDHCI_RESET_ALL."

So like these other patches, deactivate CQHCI when resetting the
controller. Do this via the new sdhci_and_cqhci_reset() helper.

This patch depends on (and should not compile without) the patch
entitled "mmc: cqhci: Provide helper for resetting both SDHCI and
CQHCI".

Fixes: 84362d7 ("mmc: sdhci-of-arasan: Add CQHCI support for arasan,sdhci-5.1")
Cc: <[email protected]>
Signed-off-by: Brian Norris <[email protected]>
Reviewed-by: Guenter Roeck <[email protected]>
Acked-by: Adrian Hunter <[email protected]>
Link: https://lore.kernel.org/r/20221026124150.v4.2.I29f6a2189e84e35ad89c1833793dca9e36c64297@changeid
Signed-off-by: Ulf Hansson <[email protected]>
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computersforpeace authored and storulf committed Nov 7, 2022
1 parent ebb5fd3 commit 5d249ac
Showing 1 changed file with 2 additions and 1 deletion.
3 changes: 2 additions & 1 deletion drivers/mmc/host/sdhci-of-arasan.c
Original file line number Diff line number Diff line change
Expand Up @@ -25,6 +25,7 @@
#include <linux/firmware/xlnx-zynqmp.h>

#include "cqhci.h"
#include "sdhci-cqhci.h"
#include "sdhci-pltfm.h"

#define SDHCI_ARASAN_VENDOR_REGISTER 0x78
Expand Down Expand Up @@ -366,7 +367,7 @@ static void sdhci_arasan_reset(struct sdhci_host *host, u8 mask)
struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
struct sdhci_arasan_data *sdhci_arasan = sdhci_pltfm_priv(pltfm_host);

sdhci_reset(host, mask);
sdhci_and_cqhci_reset(host, mask);

if (sdhci_arasan->quirks & SDHCI_ARASAN_QUIRK_FORCE_CDTEST) {
ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL);
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