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[2001:b400:e28a:abbc:b19b:27f2:8368:202e]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-1f855e55ca1sm134007805ad.49.2024.06.20.03.45.32 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 20 Jun 2024 03:45:35 -0700 (PDT) From: Victor Shih To: ulf.hansson@linaro.org, adrian.hunter@intel.com Cc: linux-mmc@vger.kernel.org, linux-kernel@vger.kernel.org, benchuanggli@gmail.com, HL.Liu@genesyslogic.com.tw, Greg.tu@genesyslogic.com.tw, takahiro.akashi@linaro.org, dlunev@chromium.org, Victor Shih , Ben Chuang , Victor Shih Subject: [PATCH V17 11/22] mmc: sdhci-uhs2: add reset function function Date: Thu, 20 Jun 2024 18:44:33 +0800 Message-Id: <20240620104444.5862-12-victorshihgli@gmail.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20240620104444.5862-1-victorshihgli@gmail.com> References: <20240620104444.5862-1-victorshihgli@gmail.com> Precedence: bulk X-Mailing-List: linux-mmc@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 From: Victor Shih Sdhci_uhs2_reset() does a UHS-II specific reset operation. Signed-off-by: Ben Chuang Signed-off-by: AKASHI Takahiro Signed-off-by: Victor Shih --- Updates in V17: - Move the sdhci_uhs2_reset_cmd_data() to the other patch it was used for the first time. Updates in V16: - Add sdhci_uhs2_reset_cmd_data() function. Updates in V15: - Refer the SD Host Controller Standard Specification Section 3.10 to add reset command data mechanism. Updates in V14: - Since mmc_card_uhs2() is the same as sdhci_uhs2_mode(), so drop sdhci_uhs2_mode() and use mmc_card_uhs2() instead of sdhci_uhs2_mode(). Updates in V13: - Use ios timing to stead MMC_UHS2_SUPPORT for indicate the UHS2 mode. Updates in V8: - Adjust the position of matching brackets. Updates in V6: - Remove unnecessary functions and simplify code. --- drivers/mmc/host/sdhci-uhs2.c | 37 +++++++++++++++++++++++++++++++++++ drivers/mmc/host/sdhci-uhs2.h | 1 + 2 files changed, 38 insertions(+) diff --git a/drivers/mmc/host/sdhci-uhs2.c b/drivers/mmc/host/sdhci-uhs2.c index 9cb0f1b2a37d..3d16f1ef9344 100644 --- a/drivers/mmc/host/sdhci-uhs2.c +++ b/drivers/mmc/host/sdhci-uhs2.c @@ -10,7 +10,9 @@ * Author: AKASHI Takahiro */ +#include #include +#include #include "sdhci.h" #include "sdhci-uhs2.h" @@ -21,6 +23,8 @@ #define SDHCI_UHS2_DUMP(f, x...) \ pr_err("%s: " DRIVER_NAME ": " f, mmc_hostname(host->mmc), ## x) +#define UHS2_RESET_TIMEOUT_100MS 100000 + void sdhci_uhs2_dump_regs(struct sdhci_host *host) { if (!(mmc_card_uhs2(host->mmc))) @@ -49,6 +53,39 @@ void sdhci_uhs2_dump_regs(struct sdhci_host *host) } EXPORT_SYMBOL_GPL(sdhci_uhs2_dump_regs); +/*****************************************************************************\ + * * + * Low level functions * + * * +\*****************************************************************************/ + +/** + * sdhci_uhs2_reset - invoke SW reset + * @host: SDHCI host + * @mask: Control mask + * + * Invoke SW reset, depending on a bit in @mask and wait for completion. + */ +void sdhci_uhs2_reset(struct sdhci_host *host, u16 mask) +{ + u32 val; + + sdhci_writew(host, mask, SDHCI_UHS2_SW_RESET); + + if (mask & SDHCI_UHS2_SW_RESET_FULL) + host->clock = 0; + + /* hw clears the bit when it's done */ + if (read_poll_timeout_atomic(sdhci_readw, val, !(val & mask), 10, + UHS2_RESET_TIMEOUT_100MS, true, host, SDHCI_UHS2_SW_RESET)) { + pr_warn("%s: %s: Reset 0x%x never completed. %s: clean reset bit.\n", __func__, + mmc_hostname(host->mmc), (int)mask, mmc_hostname(host->mmc)); + sdhci_writeb(host, 0, SDHCI_UHS2_SW_RESET); + return; + } +} +EXPORT_SYMBOL_GPL(sdhci_uhs2_reset); + /*****************************************************************************\ * * * Driver init/exit * diff --git a/drivers/mmc/host/sdhci-uhs2.h b/drivers/mmc/host/sdhci-uhs2.h index 2bfe18d29bca..caaf9fba4975 100644 --- a/drivers/mmc/host/sdhci-uhs2.h +++ b/drivers/mmc/host/sdhci-uhs2.h @@ -177,5 +177,6 @@ struct sdhci_host; void sdhci_uhs2_dump_regs(struct sdhci_host *host); +void sdhci_uhs2_reset(struct sdhci_host *host, u16 mask); #endif /* __SDHCI_UHS2_H */