On 26/09/21 12:28 pm, Chunyan Zhang wrote:
> From: Zhenxiong Lai <zhenxiong.lai@xxxxxxxxxx>
>
> According to the specification, DLL status has to be locked before using it.
>
> Signed-off-by: Zhenxiong Lai <zhenxiong.lai@xxxxxxxxxx>
> Signed-off-by: Chunyan Zhang <chunyan.zhang@xxxxxxxxxx>
Acked-by: Adrian Hunter <adrian.hunter@xxxxxxxxx>
> ---
> Changes since v1:
> * Use read_poll_timeout() instead of while loop.
> ---
> drivers/mmc/host/sdhci-sprd.c | 13 +++++++++++++
> 1 file changed, 13 insertions(+)
>
> diff --git a/drivers/mmc/host/sdhci-sprd.c b/drivers/mmc/host/sdhci-sprd.c
> index 11e375579cfb..f33e9349e4e6 100644
> --- a/drivers/mmc/host/sdhci-sprd.c
> +++ b/drivers/mmc/host/sdhci-sprd.c
> @@ -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)
>
