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mmc: sdhci-sprd: Wait until DLL locked after being configured

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According to the specification, DLL status has to be locked before using it.

Signed-off-by: Zhenxiong Lai <zhenxiong.lai@unisoc.com>
Signed-off-by: Chunyan Zhang <chunyan.zhang@unisoc.com>
Acked-by: Adrian Hunter <adrian.hunter@intel.com>
Link: https://lore.kernel.org/r/20210926092835.146449-1-zhang.lyra@gmail.com
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This commit is contained in:
Zhenxiong Lai 2021-09-26 17:28:35 +08:00 committed by Ulf Hansson
parent 0818d197d2
commit 7f00917a82
1 changed files with 13 additions and 0 deletions
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13
drivers/mmc/host/sdhci-sprd.c
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@ -8,6 +8,7 @@
#include <linux/delay.h>
#include <linux/dma-mapping.h>
#include <linux/highmem.h>
#include <linux/iopoll.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_device.h>
@ -39,6 +40,9 @@
#define SDHCI_SPRD_BIT_POSRD_DLY_INV BIT(21)
#define SDHCI_SPRD_BIT_NEGRD_DLY_INV BIT(29)
#define SDHCI_SPRD_REG_32_DLL_STS0 0x210
#define SDHCI_SPRD_DLL_LOCKED BIT(18)
#define SDHCI_SPRD_REG_32_BUSY_POSI 0x250
#define SDHCI_SPRD_BIT_OUTR_CLK_AUTO_EN BIT(25)
#define SDHCI_SPRD_BIT_INNR_CLK_AUTO_EN BIT(24)
@ -256,6 +260,15 @@ static void sdhci_sprd_enable_phy_dll(struct sdhci_host *host)
sdhci_writel(host, tmp, SDHCI_SPRD_REG_32_DLL_CFG);
/* wait 1ms */
usleep_range(1000, 1250);
if (read_poll_timeout(sdhci_readl, tmp, (tmp & SDHCI_SPRD_DLL_LOCKED),
2000, USEC_PER_SEC, false, host, SDHCI_SPRD_REG_32_DLL_STS0)) {
pr_err("%s: DLL locked fail!\n", mmc_hostname(host->mmc));
pr_info("%s: DLL_STS0 : 0x%x, DLL_CFG : 0x%x\n",
mmc_hostname(host->mmc),
sdhci_readl(host, SDHCI_SPRD_REG_32_DLL_STS0),
sdhci_readl(host, SDHCI_SPRD_REG_32_DLL_CFG));
}
}
static void sdhci_sprd_set_clock(struct sdhci_host *host, unsigned int clock)