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[2001:b400:e25c:55ec:ad14:f925:5202:a39b]) by smtp.gmail.com with ESMTPSA id n22-20020a62e516000000b006870ccfbb54sm1180649pff.196.2023.08.18.03.03.02 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 18 Aug 2023 03:03:04 -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 V10 12/23] mmc: sdhci-uhs2: skip signal_voltage_switch() Date: Fri, 18 Aug 2023 18:02:06 +0800 Message-Id: <20230818100217.12725-13-victorshihgli@gmail.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20230818100217.12725-1-victorshihgli@gmail.com> References: <20230818100217.12725-1-victorshihgli@gmail.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-mmc@vger.kernel.org From: Victor Shih 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 Acked-by: Adrian Hunter --- Updates in V5: - Use sdhci_uhs2_mode() to simplify code in sdhci_uhs2_start_signal_voltage_switch(). --- 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 fc37a34629c2..92fb69b7e209 100644 --- a/drivers/mmc/host/sdhci-uhs2.c +++ b/drivers/mmc/host/sdhci-uhs2.c @@ -142,6 +142,27 @@ static void sdhci_uhs2_set_power(struct sdhci_host *host, unsigned char mode, un } } +/*****************************************************************************\ + * * + * 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 * @@ -150,6 +171,9 @@ static void sdhci_uhs2_set_power(struct sdhci_host *host, unsigned char mode, un 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; }