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 ---
Changes in v4: - Whitespace fixup - Add Adrian's Ack
Changes in v3: - New in v3 (replacing a simple 'cqe_private == NULL' patch in v2)
drivers/mmc/host/sdhci-cqhci.h | 24 ++++++++++++++++++++++++ 1 file changed, 24 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..cf8e7ba71bbd --- /dev/null +++ b/drivers/mmc/host/sdhci-cqhci.h @@ -0,0 +1,24 @@ +/* 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__ */
On 10/26/22 12:42, 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 Acked-by: Adrian Hunter adrian.hunter@intel.com
Reviewed-by: Florian Fainelli f.fainelli@gmail.com
linux-stable-mirror@lists.linaro.org
-
Brian Norris -
Florian Fainelli