Re: [PATCH v3 1/7] mmc: cqhci: Provide helper for resetting both SDHCI and CQHCI

Adrian Hunter
2022-10-25T13:09:38Z

On 24/10/22 20:54, Brian Norris wrote:
> 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>

One cosmetic nit, otherwise:

Acked-by: Adrian Hunter <adrian.hunter@intel.com>

> ---
>
> Changes in v3:
> - New in v3 (replacing a simple 'cqe_private == NULL' patch in v2)
>
> drivers/mmc/host/sdhci-cqhci.h | 25 +++++++++++++++++++++++++
> 1 file changed, 25 insertions(+)
> create mode 100644 drivers/mmc/host/sdhci-cqhci.h
>
> diff --git a/drivers/mmc/host/sdhci-cqhci.h b/drivers/mmc/host/sdhci-cqhci.h
> new file mode 100644
> index 000000000000..270ab1f1de3c
> --- /dev/null
> +++ b/drivers/mmc/host/sdhci-cqhci.h
> @@ -0,0 +1,25 @@
> +/* 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);
> +}
> +
> +

Double blank line

> +#endif /* __MMC_HOST_SDHCI_CQHCI_H__ */