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Message-ID: <20240906175032.1580281-1-jm@ti.com>
Date: Fri, 6 Sep 2024 12:50:32 -0500
From: Judith Mendez <jm@...com>
To: Ulf Hansson <ulf.hansson@...aro.org>
CC: Adrian Hunter <adrian.hunter@...el.com>, <linux-mmc@...r.kernel.org>,
<linux-kernel@...r.kernel.org>
Subject: [PATCH v1] mmc: sdhci_am654: Add sdhci_am654_start_signal_voltage_switch
The sdhci_start_signal_voltage_switch function sets
V1P8_SIGNAL_ENA by default after switching to 1v8 signaling.
V1P8_SIGNAL_ENA determines whether to launch cmd/data on neg
edge or pos edge of clock.
Due to some eMMC and SD failures seen across am62x platform,
do not set V1P8_SIGNAL_ENA by default, only enable the bit
for devices that require this bit in order to switch to 1v8
voltage for uhs modes.
Signed-off-by: Judith Mendez <jm@...com>
---
drivers/mmc/host/sdhci_am654.c | 86 ++++++++++++++++++++++++++++++++++
1 file changed, 86 insertions(+)
diff --git a/drivers/mmc/host/sdhci_am654.c b/drivers/mmc/host/sdhci_am654.c
index 0aa3c40ea6ed8..fb6232e56606b 100644
--- a/drivers/mmc/host/sdhci_am654.c
+++ b/drivers/mmc/host/sdhci_am654.c
@@ -155,6 +155,7 @@ struct sdhci_am654_data {
u32 tuning_loop;
#define SDHCI_AM654_QUIRK_FORCE_CDTEST BIT(0)
+#define SDHCI_AM654_QUIRK_SET_V1P8_ENA BIT(1)
};
struct window {
@@ -356,6 +357,79 @@ static void sdhci_j721e_4bit_set_clock(struct sdhci_host *host,
sdhci_set_clock(host, clock);
}
+int sdhci_am654_start_signal_voltage_switch(struct mmc_host *mmc,
+ struct mmc_ios *ios)
+{
+ struct sdhci_host *host = mmc_priv(mmc);
+ struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
+ struct sdhci_am654_data *sdhci_am654 = sdhci_pltfm_priv(pltfm_host);
+ u16 ctrl;
+ int ret;
+
+ if (host->version < SDHCI_SPEC_300)
+ return 0;
+
+ switch (ios->signal_voltage) {
+ case MMC_SIGNAL_VOLTAGE_330:
+ if (!(host->flags & SDHCI_SIGNALING_330))
+ return -EINVAL;
+
+ ctrl &= ~SDHCI_CTRL_VDD_180;
+ sdhci_writew(host, ctrl, SDHCI_HOST_CONTROL2);
+
+ if (!IS_ERR(mmc->supply.vqmmc)) {
+ ret = mmc_regulator_set_vqmmc(mmc, ios);
+ if (ret < 0) {
+ pr_warn("%s: Switching to 3.3V signalling voltage failed\n",
+ mmc_hostname(mmc));
+ return -EIO;
+ }
+ }
+
+ usleep_range(5000, 5500);
+
+ ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2);
+ if (!(ctrl & SDHCI_CTRL_VDD_180))
+ return 0;
+
+ pr_warn("%s: 3.3V regulator output did not become stable\n",
+ mmc_hostname(mmc));
+
+ return -EAGAIN;
+
+ case MMC_SIGNAL_VOLTAGE_180:
+ if (!(host->flags & SDHCI_SIGNALING_180))
+ return -EINVAL;
+
+ if (!IS_ERR(mmc->supply.vqmmc)) {
+ ret = mmc_regulator_set_vqmmc(mmc, ios);
+ if (ret < 0) {
+ pr_warn("%s: Switching to 1.8V signalling voltage failed\n",
+ mmc_hostname(mmc));
+ return -EIO;
+ }
+ }
+
+ if (sdhci_am654->quirks & SDHCI_AM654_QUIRK_SET_V1P8_ENA) {
+ ctrl |= SDHCI_CTRL_VDD_180;
+ sdhci_writew(host, ctrl, SDHCI_HOST_CONTROL2);
+
+ ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2);
+ if (ctrl & SDHCI_CTRL_VDD_180)
+ return 0;
+
+ pr_warn("%s: 1.8V regulator output did not become stable\n",
+ mmc_hostname(mmc));
+
+ return -EAGAIN;
+ }
+ return 0;
+
+ default:
+ return 0;
+ }
+}
+
static u8 sdhci_am654_write_power_on(struct sdhci_host *host, u8 val, int reg)
{
writeb(val, host->ioaddr + reg);
@@ -801,6 +875,8 @@ static int sdhci_am654_get_of_property(struct platform_device *pdev,
struct sdhci_am654_data *sdhci_am654)
{
struct device *dev = &pdev->dev;
+ struct device_node *np = dev->of_node;
+ struct device_node *node;
int drv_strength;
int ret;
@@ -844,6 +920,15 @@ static int sdhci_am654_get_of_property(struct platform_device *pdev,
if (device_property_read_bool(dev, "ti,fails-without-test-cd"))
sdhci_am654->quirks |= SDHCI_AM654_QUIRK_FORCE_CDTEST;
+ node = of_parse_phandle(np, "vmmc-supply", 0);
+
+ if (node) {
+ node = of_parse_phandle(np, "vqmmc-supply", 0);
+
+ if (!node)
+ sdhci_am654->quirks |= SDHCI_AM654_QUIRK_SET_V1P8_ENA;
+ }
+
sdhci_get_of_property(pdev);
return 0;
@@ -940,6 +1025,7 @@ static int sdhci_am654_probe(struct platform_device *pdev)
goto err_pltfm_free;
}
+ host->mmc_host_ops.start_signal_voltage_switch = sdhci_am654_start_signal_voltage_switch;
host->mmc_host_ops.execute_tuning = sdhci_am654_execute_tuning;
pm_runtime_get_noresume(dev);
base-commit: cf6444ba528f043398b112ac36e041a4d8685cb1
--
2.46.0
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