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[92.34.204.253]) by smtp.gmail.com with ESMTPSA id y5sm1345349lfa.148.2021.06.19.15.54.05 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 19 Jun 2021 15:54:05 -0700 (PDT) From: Linus Walleij To: linux-mmc@vger.kernel.org, Ulf Hansson Cc: Linus Walleij , Russell King , Yann Gautier , Ludovic Barre Subject: [PATCH 2/3] mmc: mmci: Implement .hw_reset() callback Date: Sun, 20 Jun 2021 00:51:17 +0200 Message-Id: <20210619225118.1862634-2-linus.walleij@linaro.org> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210619225118.1862634-1-linus.walleij@linaro.org> References: <20210619225118.1862634-1-linus.walleij@linaro.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-mmc@vger.kernel.org The .hw_reset() callback is optionally called when attaching a host if and only if MMC_CAP_HW_RESET is set on the host, which can be done from the device tree by putting the flag cap-mmc-hw-reset in the DT node. This is sometimes helpful for eMMC. Cc: Russell King Cc: Yann Gautier Cc: Ludovic Barre Signed-off-by: Linus Walleij --- drivers/mmc/host/mmci.c | 10 ++++++++++ 1 file changed, 10 insertions(+) -- 2.31.1 diff --git a/drivers/mmc/host/mmci.c b/drivers/mmc/host/mmci.c index af2ed6013ef9..97fa5e67ca0c 100644 --- a/drivers/mmc/host/mmci.c +++ b/drivers/mmc/host/mmci.c @@ -1883,6 +1883,15 @@ static int mmci_sig_volt_switch(struct mmc_host *mmc, struct mmc_ios *ios) return ret; } +static void mmci_hw_reset(struct mmc_host *mmc) +{ + struct mmci_host *host = mmc_priv(mmc); + + reset_control_assert(host->rst); + udelay(2); + reset_control_deassert(host->rst); +} + static struct mmc_host_ops mmci_ops = { .request = mmci_request, .pre_req = mmci_pre_request, @@ -1891,6 +1900,7 @@ static struct mmc_host_ops mmci_ops = { .get_ro = mmc_gpio_get_ro, .get_cd = mmci_get_cd, .start_signal_voltage_switch = mmci_sig_volt_switch, + .hw_reset = mmci_hw_reset, }; static void mmci_probe_level_translator(struct mmc_host *mmc)