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sdhci-fujitsu: add support for setting the CMD_DAT_DELAY attribute

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The Socionext SynQuacer SoC inherits this IP from Fujitsu, but
requires the F_SDH30_CMD_DAT_DELAY bit to be set in the
F_SDH30_ESD_CONTROL control register. So set this bit if the
DT node has the 'fujitsu,cmd-dat-delay-select' property.

Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Acked-by: Adrian Hunter <adrian.hunter@intel.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This commit is contained in:
Ard Biesheuvel 2017-11-06 15:29:23 +00:00 committed by Ulf Hansson
parent 167e5b6f98
commit 06641e8dea
1 changed files with 14 additions and 0 deletions
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14
drivers/mmc/host/sdhci_f_sdh30.c
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@ -13,6 +13,7 @@
#include <linux/err.h>
#include <linux/delay.h>
#include <linux/module.h>
#include <linux/property.h>
#include <linux/clk.h>
#include "sdhci-pltfm.h"
@ -47,6 +48,7 @@ struct f_sdhost_priv {
struct clk *clk;
u32 vendor_hs200;
struct device *dev;
bool enable_cmd_dat_delay;
};
static void sdhci_f_sdh30_soft_voltage_switch(struct sdhci_host *host)
@ -84,10 +86,19 @@ static unsigned int sdhci_f_sdh30_get_min_clock(struct sdhci_host *host)
static void sdhci_f_sdh30_reset(struct sdhci_host *host, u8 mask)
{
struct f_sdhost_priv *priv = sdhci_priv(host);
u32 ctl;
if (sdhci_readw(host, SDHCI_CLOCK_CONTROL) == 0)
sdhci_writew(host, 0xBC01, SDHCI_CLOCK_CONTROL);
sdhci_reset(host, mask);
if (priv->enable_cmd_dat_delay) {
ctl = sdhci_readl(host, F_SDH30_ESD_CONTROL);
ctl |= F_SDH30_CMD_DAT_DELAY;
sdhci_writel(host, ctl, F_SDH30_ESD_CONTROL);
}
}
static const struct sdhci_ops sdhci_f_sdh30_ops = {
@ -126,6 +137,9 @@ static int sdhci_f_sdh30_probe(struct platform_device *pdev)
host->quirks2 = SDHCI_QUIRK2_SUPPORT_SINGLE |
SDHCI_QUIRK2_TUNING_WORK_AROUND;
priv->enable_cmd_dat_delay = device_property_read_bool(dev,
"fujitsu,cmd-dat-delay-select");
ret = mmc_of_parse(host->mmc);
if (ret)
goto err;