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[2001:b400:e282:2aaa:c1aa:6c8:e68:c5ee]) by smtp.gmail.com with ESMTPSA id x8-20020a170902ec8800b001746f66244asm1606678plg.18.2022.10.14.04.47.45 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 14 Oct 2022 04:47:47 -0700 (PDT) From: Victor Shih X-Google-Original-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 Subject: [PATCH V5 13/26] mmc: sdhci-uhs2: skip signal_voltage_switch() Date: Fri, 14 Oct 2022 19:45:48 +0800 Message-Id: <20221014114601.15594-14-victor.shih@genesyslogic.com.tw> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20221014114601.15594-1-victor.shih@genesyslogic.com.tw> References: <20221014114601.15594-1-victor.shih@genesyslogic.com.tw> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-mmc@vger.kernel.org For UHS2, the signal voltage is supplied by vdd2 which is already 1.8v, so no voltage switch required. Signed-off-by: Ben Chuang Signed-off-by: AKASHI Takahiro Signed-off-by: Victor Shih --- drivers/mmc/host/sdhci-uhs2.c | 24 ++++++++++++++++++++++++ 1 file changed, 24 insertions(+) diff --git a/drivers/mmc/host/sdhci-uhs2.c b/drivers/mmc/host/sdhci-uhs2.c index 896a1c8e55cf..4dc3e904d7d2 100644 --- a/drivers/mmc/host/sdhci-uhs2.c +++ b/drivers/mmc/host/sdhci-uhs2.c @@ -196,6 +196,27 @@ void sdhci_uhs2_set_power(struct sdhci_host *host, unsigned char mode, } EXPORT_SYMBOL_GPL(sdhci_uhs2_set_power); +/*****************************************************************************\ + * * + * MMC callbacks * + * * +\*****************************************************************************/ + +static int sdhci_uhs2_start_signal_voltage_switch(struct mmc_host *mmc, + struct mmc_ios *ios) +{ + struct sdhci_host *host = mmc_priv(mmc); + + /* + * For UHS2, the signal voltage is supplied by vdd2 which is + * already 1.8v so no voltage switch required. + */ + if (sdhci_uhs2_mode(host)) + return 0; + + return sdhci_start_signal_voltage_switch(mmc, ios); +} + /*****************************************************************************\ * * * Driver init/exit * @@ -204,6 +225,9 @@ EXPORT_SYMBOL_GPL(sdhci_uhs2_set_power); static int sdhci_uhs2_host_ops_init(struct sdhci_host *host) { + host->mmc_host_ops.start_signal_voltage_switch = + sdhci_uhs2_start_signal_voltage_switch; + return 0; }