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[218.35.143.223]) by smtp.gmail.com with ESMTPSA id c19sm1663479pfp.184.2021.07.21.21.02.13 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 21 Jul 2021 21:02:15 -0700 (PDT) From: Jason Lai To: ulf.hansson@linaro.org, adrian.hunter@intel.com Cc: linux-mmc@vger.kernel.org, linux-kernel@vger.kernel.org, ben.chuang@genesyslogic.com.tw, greg.tu@genesyslogic.com.tw, jason.lai@genesyslogiv.com.tw, AKASHI Takahiro Subject: [RFC PATCH v3.2 12/29] mmc: sdhci-uhs2: add reset function Date: Thu, 22 Jul 2021 12:01:07 +0800 Message-Id: <20210722040124.7573-12-jasonlai.genesyslogic@gmail.com> X-Mailer: git-send-email 2.32.0 In-Reply-To: <20210722040124.7573-1-jasonlai.genesyslogic@gmail.com> References: <20210722040124.7573-1-jasonlai.genesyslogic@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Sdhci_uhs2_reset() does a UHS-II specific reset operation. Signed-off-by: Ben Chuang Signed-off-by: AKASHI Takahiro --- drivers/mmc/host/sdhci-uhs2.c | 49 +++++++++++++++++++++++++++++++++++ drivers/mmc/host/sdhci-uhs2.h | 1 + drivers/mmc/host/sdhci.c | 3 ++- drivers/mmc/host/sdhci.h | 1 + 4 files changed, 53 insertions(+), 1 deletion(-) diff --git a/drivers/mmc/host/sdhci-uhs2.c b/drivers/mmc/host/sdhci-uhs2.c index 08905ed081fb..e2b9743fe17d 100644 --- a/drivers/mmc/host/sdhci-uhs2.c +++ b/drivers/mmc/host/sdhci-uhs2.c @@ -10,6 +10,7 @@ * Author: AKASHI Takahiro */ +#include #include #include "sdhci.h" @@ -49,6 +50,54 @@ 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) +{ + unsigned long timeout; + + if (!(host->mmc->caps & MMC_CAP_UHS2)) + return; + + sdhci_writew(host, mask, SDHCI_UHS2_SW_RESET); + + if (mask & SDHCI_UHS2_SW_RESET_FULL) { + host->clock = 0; + /* Reset-all turns off SD Bus Power */ + if (host->quirks2 & SDHCI_QUIRK2_CARD_ON_NEEDS_BUS_ON) + sdhci_runtime_pm_bus_off(host); + } + + /* Wait max 100 ms */ + timeout = 10000; + + /* hw clears the bit when it's done */ + while (sdhci_readw(host, SDHCI_UHS2_SW_RESET) & mask) { + if (timeout == 0) { + pr_err("%s: %s: Reset 0x%x never completed.\n", + __func__, mmc_hostname(host->mmc), (int)mask); + pr_err("%s: clean reset bit\n", + mmc_hostname(host->mmc)); + sdhci_writeb(host, 0, SDHCI_UHS2_SW_RESET); + return; + } + timeout--; + udelay(10); + } +} +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 b9529d32b58d..7bb7a0d67109 100644 --- a/drivers/mmc/host/sdhci-uhs2.h +++ b/drivers/mmc/host/sdhci-uhs2.h @@ -210,5 +210,6 @@ 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 */ diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c index 97e7e04e4614..78db850dc1f3 100644 --- a/drivers/mmc/host/sdhci.c +++ b/drivers/mmc/host/sdhci.c @@ -194,13 +194,14 @@ static void sdhci_runtime_pm_bus_on(struct sdhci_host *host) pm_runtime_get_noresume(mmc_dev(host->mmc)); } -static void sdhci_runtime_pm_bus_off(struct sdhci_host *host) +void sdhci_runtime_pm_bus_off(struct sdhci_host *host) { if (!host->bus_on) return; host->bus_on = false; pm_runtime_put_noidle(mmc_dev(host->mmc)); } +EXPORT_SYMBOL_GPL(sdhci_runtime_pm_bus_off); void sdhci_reset(struct sdhci_host *host, u8 mask) { diff --git a/drivers/mmc/host/sdhci.h b/drivers/mmc/host/sdhci.h index d9d7a76cedc1..b9932423db08 100644 --- a/drivers/mmc/host/sdhci.h +++ b/drivers/mmc/host/sdhci.h @@ -831,6 +831,7 @@ static inline void sdhci_read_caps(struct sdhci_host *host) __sdhci_read_caps(host, NULL, NULL, NULL); } +void sdhci_runtime_pm_bus_off(struct sdhci_host *host); u16 sdhci_calc_clk(struct sdhci_host *host, unsigned int clock, unsigned int *actual_clock); void sdhci_set_clock(struct sdhci_host *host, unsigned int clock); -- 2.32.0