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mmc: cqhci: Provide helper for resetting both SDHCI and CQHCI

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Several SDHCI drivers need to deactivate command queueing in their reset
hook (see sdhci_cqhci_reset() / sdhci-pci-core.c, for example), and
several more are coming.

Those reset implementations have some small subtleties (e.g., ordering
of initialization of SDHCI vs. CQHCI might leave us resetting with a
NULL ->cqe_private), and are often identical across different host
drivers.

We also don't want to force a dependency between SDHCI and CQHCI, or
vice versa; non-SDHCI drivers use CQHCI, and SDHCI drivers might support
command queueing through some other means.

So, implement a small helper, to avoid repeating the same mistakes in
different drivers. Simply stick it in a header, because it's so small it
doesn't deserve its own module right now, and inlining to each driver is
pretty reasonable.

This is marked for -stable, as it is an important prerequisite patch for
several SDHCI controller bugfixes that follow.

Cc: <stable@vger.kernel.org>
Signed-off-by: Brian Norris <briannorris@chromium.org>
Acked-by: Adrian Hunter <adrian.hunter@intel.com>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Link: https://lore.kernel.org/r/20221026124150.v4.1.Ie85faa09432bfe1b0890d8c24ff95e17f3097317@changeid
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This commit is contained in:
Brian Norris 2022-10-26 12:42:03 -07:00 committed by Ulf Hansson
parent f0c4d9fc9c
commit ebb5fd38f4
1 changed files with 24 additions and 0 deletions
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24
drivers/mmc/host/sdhci-cqhci.h Normal file
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/* SPDX-License-Identifier: GPL-2.0-only */
/*
* Copyright 2022 The Chromium OS Authors
*
* Support that applies to the combination of SDHCI and CQHCI, while not
* expressing a dependency between the two modules.
*/
#ifndef __MMC_HOST_SDHCI_CQHCI_H__
#define __MMC_HOST_SDHCI_CQHCI_H__
#include "cqhci.h"
#include "sdhci.h"
static inline void sdhci_and_cqhci_reset(struct sdhci_host *host, u8 mask)
{
if ((host->mmc->caps2 & MMC_CAP2_CQE) && (mask & SDHCI_RESET_ALL) &&
host->mmc->cqe_private)
cqhci_deactivate(host->mmc);
sdhci_reset(host, mask);
}
#endif /* __MMC_HOST_SDHCI_CQHCI_H__ */