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mmc: am654_sdhci: Fix HISPD bit configuration in some lower speed modes

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According to the AM654x Data Manual[1], the setup timing in lower speed
modes can only be met if the controller uses a falling edge data launch.

To ensure this, the HIGH_SPEED_ENA (HOST_CONTROL[2]) bit should be
cleared in default speed, SD high speed, MMC high speed, SDR12 and SDR25
speed modes.

Use the sdhci writeb callback to implement this condition.

[1] http://www.ti.com/lit/gpn/am6546 Section 5.10.5.16.1

Signed-off-by: Faiz Abbas <faiz_abbas@ti.com>
Signed-off-by: Aswath Govindraju <a-govindraju@ti.com>
Reviewed-by: Jaehoon Chung <jh80.chung@samsung.com>
This commit is contained in:
Faiz Abbas 2021-02-04 15:10:54 +05:30 • committed by Lokesh Vutla
parent a759abf569
commit 27a87c834f
2 changed files with 24 additions and 2 deletions
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1
drivers/mmc/Kconfig
View file

@ -526,6 +526,7 @@ config MMC_SDHCI_AM654
depends on MMC_SDHCI
depends on DM_MMC && OF_CONTROL && BLK
depends on REGMAP
select MMC_SDHCI_IO_ACCESSORS
help
Support for Secure Digital Host Controller Interface (SDHCI)
controllers present on TI's AM654 SOCs.

25
drivers/mmc/am654_sdhci.c
View file

@ -369,6 +369,26 @@ static int am654_sdhci_deferred_probe(struct sdhci_host *host)
return sdhci_probe(dev);
}
static void am654_sdhci_write_b(struct sdhci_host *host, u8 val, int reg)
{
if (reg == SDHCI_HOST_CONTROL) {
switch (host->mmc->selected_mode) {
/*
* According to the data manual, HISPD bit
* should not be set in these speed modes.
*/
case SD_HS:
case MMC_HS:
case UHS_SDR12:
case UHS_SDR25:
val &= ~SDHCI_CTRL_HISPD;
default:
break;
}
}
writeb(val, host->ioaddr + reg);
}
#ifdef MMC_SUPPORTS_TUNING
#define ITAP_MAX 32
static int am654_sdhci_execute_tuning(struct mmc *mmc, u8 opcode)
@ -414,6 +434,7 @@ const struct sdhci_ops am654_sdhci_ops = {
.deferred_probe = am654_sdhci_deferred_probe,
.set_ios_post = &am654_sdhci_set_ios_post,
.set_control_reg = &am654_sdhci_set_control_reg,
.write_b = am654_sdhci_write_b,
};
const struct am654_driver_data am654_drv_data = {
@ -455,6 +476,7 @@ const struct sdhci_ops j721e_4bit_sdhci_ops = {
#endif
.deferred_probe = am654_sdhci_deferred_probe,
.set_ios_post = &j721e_4bit_sdhci_set_ios_post,
.write_b = am654_sdhci_write_b,
};
const struct am654_driver_data j721e_4bit_drv_data = {
@ -532,6 +554,7 @@ static int am654_sdhci_probe(struct udevice *dev)
host->max_clk = clock;
host->mmc = &plat->mmc;
host->mmc->dev = dev;
host->ops = drv_data->ops;
ret = sdhci_setup_cfg(cfg, host, cfg->f_max,
AM654_SDHCI_MIN_FREQ);
if (ret)
@ -541,8 +564,6 @@ static int am654_sdhci_probe(struct udevice *dev)
if (ret)
return ret;
host->ops = drv_data->ops;
/* Update ops based on SoC revision */
soc = soc_device_match(am654_sdhci_soc_attr);
if (soc && soc->data) {