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rockchip: sdhci: Add HS400 Enhanced Strobe support for RK3399

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On RK3399, a register bit must be set to enable Enhanced Strobe.
Let the Rockchip SDHCI driver set it when Enhanced Strobe configuration
is requested. However, having it set makes the lower-speed modes stop
working and makes reinitialization fail, so let it be unset as needed in
set_control_reg().

This is mostly ported from Linux's Arasan SDHCI driver which happens
to be the underlying IP. (drivers/mmc/host/sdhci-of-arasan.c in Linux
tree).

Signed-off-by: Alper Nebi Yasak <alpernebiyasak@gmail.com>
Reviewed-by: Jaehoon Chung <jh80.chung@samsung.com>
Reviewed-by: Kever Yang <kever.yang@rock-chips.com>
This commit is contained in:
Alper Nebi Yasak 2022-03-15 20:46:27 +03:00 committed by Jaehoon Chung
parent 2a1d7c635f
commit c35af78317
1 changed files with 53 additions and 0 deletions
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53
drivers/mmc/rockchip_sdhci.c
View file

@ -42,6 +42,9 @@
((((x) >> PHYCTRL_DLLRDY_SHIFT) & PHYCTRL_DLLRDY_MASK) ==\
PHYCTRL_DLLRDY_DONE)
#define ARASAN_VENDOR_REGISTER 0x78
#define ARASAN_VENDOR_ENHANCED_STROBE BIT(0)
/* Rockchip specific Registers */
#define DWCMSHC_EMMC_DLL_CTRL 0x800
#define DWCMSHC_EMMC_DLL_CTRL_RESET BIT(1)
@ -117,6 +120,19 @@ struct sdhci_data {
* Return: 0 if successful, -ve on error
*/
int (*set_ios_post)(struct sdhci_host *host);
/**
* set_enhanced_strobe() - Set HS400 Enhanced Strobe config
*
* This is the set_enhanced_strobe() SDHCI operation that should
* be used for the hardware this driver data is associated with.
* Normally, this is used to set any host-specific configuration
* necessary for HS400 ES.
*
* @host: SDHCI host structure
* Return: 0 if successful, -ve on error
*/
int (*set_enhanced_strobe)(struct sdhci_host *host);
};
static int rk3399_emmc_phy_init(struct udevice *dev)
@ -206,6 +222,21 @@ static int rk3399_emmc_get_phy(struct udevice *dev)
return 0;
}
static int rk3399_sdhci_set_enhanced_strobe(struct sdhci_host *host)
{
struct mmc *mmc = host->mmc;
u32 vendor;
vendor = sdhci_readl(host, ARASAN_VENDOR_REGISTER);
if (mmc->selected_mode == MMC_HS_400_ES)
vendor |= ARASAN_VENDOR_ENHANCED_STROBE;
else
vendor &= ~ARASAN_VENDOR_ENHANCED_STROBE;
sdhci_writel(host, vendor, ARASAN_VENDOR_REGISTER);
return 0;
}
static void rk3399_sdhci_set_control_reg(struct sdhci_host *host)
{
struct rockchip_sdhc *priv = container_of(host, struct rockchip_sdhc, host);
@ -217,6 +248,15 @@ static void rk3399_sdhci_set_control_reg(struct sdhci_host *host)
rk3399_emmc_phy_power_off(priv->phy);
sdhci_set_control_reg(host);
/*
* Reinitializing the device tries to set it to lower-speed modes
* first, which fails if the Enhanced Strobe bit is set, making
* the device impossible to use. Set the correct value here to
* let reinitialization attempts succeed.
*/
if (CONFIG_IS_ENABLED(MMC_HS400_ES_SUPPORT))
rk3399_sdhci_set_enhanced_strobe(host);
};
static int rk3399_sdhci_set_ios_post(struct sdhci_host *host)
@ -409,10 +449,22 @@ static int rockchip_sdhci_execute_tuning(struct mmc *mmc, u8 opcode)
return ret;
}
static int rockchip_sdhci_set_enhanced_strobe(struct sdhci_host *host)
{
struct rockchip_sdhc *priv = container_of(host, struct rockchip_sdhc, host);
struct sdhci_data *data = (struct sdhci_data *)dev_get_driver_data(priv->dev);
if (data->set_enhanced_strobe)
return data->set_enhanced_strobe(host);
return -ENOTSUPP;
}
static struct sdhci_ops rockchip_sdhci_ops = {
.set_ios_post = rockchip_sdhci_set_ios_post,
.platform_execute_tuning = &rockchip_sdhci_execute_tuning,
.set_control_reg = rockchip_sdhci_set_control_reg,
.set_enhanced_strobe = rockchip_sdhci_set_enhanced_strobe,
};
static int rockchip_sdhci_probe(struct udevice *dev)
@ -495,6 +547,7 @@ static const struct sdhci_data rk3399_data = {
.emmc_phy_init = rk3399_emmc_phy_init,
.set_control_reg = rk3399_sdhci_set_control_reg,
.set_ios_post = rk3399_sdhci_set_ios_post,
.set_enhanced_strobe = rk3399_sdhci_set_enhanced_strobe,
};
static const struct sdhci_data rk3568_data = {