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Message-Id: <20221213090047.3805-12-victor.shih@genesyslogic.com.tw>
Date: Tue, 13 Dec 2022 17:00:34 +0800
From: Victor Shih <victorshihgli@...il.com>
To: ulf.hansson@...aro.org, adrian.hunter@...el.com
Cc: linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org,
benchuanggli@...il.com, HL.Liu@...esyslogic.com.tw,
Greg.tu@...esyslogic.com.tw, takahiro.akashi@...aro.org,
dlunev@...omium.org, Victor Shih <victor.shih@...esyslogic.com.tw>,
Ben Chuang <ben.chuang@...esyslogic.com.tw>
Subject: [PATCH V6 11/24] mmc: sdhci-uhs2: add set_power() to support vdd2
This is a UHS-II version of sdhci's set_power operation.
VDD2, as well as VDD, is handled here.
Signed-off-by: Ben Chuang <ben.chuang@...esyslogic.com.tw>
Signed-off-by: AKASHI Takahiro <takahiro.akashi@...aro.org>
Signed-off-by: Victor Shih <victor.shih@...esyslogic.com.tw>
---
drivers/mmc/host/sdhci-uhs2.c | 46 +++++++++++++++++++++++++
drivers/mmc/host/sdhci.c | 63 +++++++++++++++++++----------------
drivers/mmc/host/sdhci.h | 1 +
3 files changed, 82 insertions(+), 28 deletions(-)
diff --git a/drivers/mmc/host/sdhci-uhs2.c b/drivers/mmc/host/sdhci-uhs2.c
index ae862e1eadab..780491781613 100644
--- a/drivers/mmc/host/sdhci-uhs2.c
+++ b/drivers/mmc/host/sdhci-uhs2.c
@@ -57,6 +57,13 @@ EXPORT_SYMBOL_GPL(sdhci_uhs2_dump_regs);
* *
\*****************************************************************************/
+static inline int mmc_opt_regulator_set_ocr(struct mmc_host *mmc,
+ struct regulator *supply,
+ unsigned short vdd_bit)
+{
+ return IS_ERR_OR_NULL(supply) ? 0 : mmc_regulator_set_ocr(mmc, supply, vdd_bit);
+}
+
bool sdhci_uhs2_mode(struct sdhci_host *host)
{
return host->mmc->flags & MMC_UHS2_SUPPORT;
@@ -95,6 +102,45 @@ void sdhci_uhs2_reset(struct sdhci_host *host, u16 mask)
}
EXPORT_SYMBOL_GPL(sdhci_uhs2_reset);
+static void sdhci_uhs2_set_power(struct sdhci_host *host, unsigned char mode,
+ unsigned short vdd)
+{
+ struct mmc_host *mmc = host->mmc;
+ u8 pwr;
+
+ if (mode != MMC_POWER_OFF) {
+ pwr = sdhci_get_vdd_value(vdd);
+ if (!pwr)
+ WARN(1, "%s: Invalid vdd %#x\n",
+ mmc_hostname(host->mmc), vdd);
+ pwr |= SDHCI_VDD2_POWER_180;
+ }
+
+ if (host->pwr == pwr)
+ return;
+ host->pwr = pwr;
+
+ if (pwr == 0) {
+ sdhci_writeb(host, 0, SDHCI_POWER_CONTROL);
+
+ mmc_opt_regulator_set_ocr(mmc, mmc->supply.vmmc, 0);
+ mmc_opt_regulator_set_ocr(mmc, mmc->supply.vmmc2, 0);
+ } else {
+ mmc_opt_regulator_set_ocr(mmc, mmc->supply.vmmc, vdd);
+ /* support 1.8v only for now */
+ mmc_opt_regulator_set_ocr(mmc, mmc->supply.vmmc2, fls(MMC_VDD2_165_195) - 1);
+
+ /* vdd first */
+ pwr |= SDHCI_POWER_ON;
+ sdhci_writeb(host, pwr & 0xf, SDHCI_POWER_CONTROL);
+ mdelay(5);
+
+ pwr |= SDHCI_VDD2_POWER_ON;
+ sdhci_writeb(host, pwr, SDHCI_POWER_CONTROL);
+ mdelay(5);
+ }
+}
+
/*****************************************************************************\
* *
* Driver init/exit *
diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
index 9b66b9a32c72..99633a3ef549 100644
--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c
@@ -23,7 +23,7 @@
#include <linux/regulator/consumer.h>
#include <linux/pm_runtime.h>
#include <linux/of.h>
-
+#include <linux/bug.h>
#include <linux/leds.h>
#include <linux/mmc/mmc.h>
@@ -2061,41 +2061,48 @@ static void sdhci_set_power_reg(struct sdhci_host *host, unsigned char mode,
sdhci_writeb(host, 0, SDHCI_POWER_CONTROL);
}
+unsigned short sdhci_get_vdd_value(unsigned short vdd)
+{
+ u8 pwr;
+
+ switch (1 << vdd) {
+ case MMC_VDD_165_195:
+ /*
+ * Without a regulator, SDHCI does not support 2.0v
+ * so we only get here if the driver deliberately
+ * added the 2.0v range to ocr_avail. Map it to 1.8v
+ * for the purpose of turning on the power.
+ */
+ case MMC_VDD_20_21:
+ pwr = SDHCI_POWER_180;
+ break;
+ case MMC_VDD_29_30:
+ case MMC_VDD_30_31:
+ pwr = SDHCI_POWER_300;
+ break;
+ case MMC_VDD_32_33:
+ case MMC_VDD_33_34:
+ pwr = SDHCI_POWER_330;
+ break;
+ default:
+ pwr = 0;
+ break;
+ }
+
+ return pwr;
+}
+EXPORT_SYMBOL_GPL(sdhci_get_vdd_value);
+
void sdhci_set_power_noreg(struct sdhci_host *host, unsigned char mode,
unsigned short vdd)
{
u8 pwr = 0;
if (mode != MMC_POWER_OFF) {
- switch (1 << vdd) {
- case MMC_VDD_165_195:
- /*
- * Without a regulator, SDHCI does not support 2.0v
- * so we only get here if the driver deliberately
- * added the 2.0v range to ocr_avail. Map it to 1.8v
- * for the purpose of turning on the power.
- */
- case MMC_VDD_20_21:
- pwr = SDHCI_POWER_180;
- break;
- case MMC_VDD_29_30:
- case MMC_VDD_30_31:
- pwr = SDHCI_POWER_300;
- break;
- case MMC_VDD_32_33:
- case MMC_VDD_33_34:
- /*
- * 3.4 ~ 3.6V are valid only for those platforms where it's
- * known that the voltage range is supported by hardware.
- */
- case MMC_VDD_34_35:
- case MMC_VDD_35_36:
- pwr = SDHCI_POWER_330;
- break;
- default:
+ pwr = sdhci_get_vdd_value(vdd);
+ if (!pwr) {
WARN(1, "%s: Invalid vdd %#x\n",
mmc_hostname(host->mmc), vdd);
- break;
}
}
diff --git a/drivers/mmc/host/sdhci.h b/drivers/mmc/host/sdhci.h
index f41c19c76994..df7fa0c0ebf8 100644
--- a/drivers/mmc/host/sdhci.h
+++ b/drivers/mmc/host/sdhci.h
@@ -840,6 +840,7 @@ void sdhci_set_power(struct sdhci_host *host, unsigned char mode,
void sdhci_set_power_and_bus_voltage(struct sdhci_host *host,
unsigned char mode,
unsigned short vdd);
+unsigned short sdhci_get_vdd_value(unsigned short vdd);
void sdhci_set_power_noreg(struct sdhci_host *host, unsigned char mode,
unsigned short vdd);
int sdhci_get_cd_nogpio(struct mmc_host *mmc);
--
2.25.1
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