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Wed, 26 Oct 2022 12:42:28 -0700 (PDT) Received: from localhost ([2620:15c:9d:2:c9e3:74f3:6b2b:135]) by smtp.gmail.com with UTF8SMTPSA id h11-20020a170902f2cb00b001837463f654sm3245037plc.251.2022.10.26.12.42.27 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 26 Oct 2022 12:42:28 -0700 (PDT) From: Brian Norris To: Ulf Hansson Cc: Shawn Guo , linux-mmc@vger.kernel.org, Adrian Hunter , Shawn Lin , Michal Simek , Sascha Hauer , Bjorn Andersson , Thierry Reding , linux-arm-msm@vger.kernel.org, linux-arm-kernel@lists.infradead.org, Broadcom internal kernel review list , Jonathan Hunter , Andy Gross , Pengutronix Kernel Team , linux-kernel@vger.kernel.org, Konrad Dybcio , Al Cooper , Fabio Estevam , Florian Fainelli , NXP Linux Team , Haibo Chen , Sowjanya Komatineni , Brian Norris , stable@vger.kernel.org Subject: [PATCH v4 1/7] mmc: cqhci: Provide helper for resetting both SDHCI and CQHCI Date: Wed, 26 Oct 2022 12:42:03 -0700 Message-Id: <20221026124150.v4.1.Ie85faa09432bfe1b0890d8c24ff95e17f3097317@changeid> X-Mailer: git-send-email 2.38.0.135.g90850a2211-goog In-Reply-To: <20221026194209.3758834-1-briannorris@chromium.org> References: <20221026194209.3758834-1-briannorris@chromium.org> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20221026_124232_437197_82CC2829 X-CRM114-Status: GOOD ( 17.50 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org 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: Signed-off-by: Brian Norris Acked-by: Adrian Hunter Reviewed-by: Florian Fainelli --- 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__ */