[V2,15/15] mmc: sdhci-esdhc-imx: clear tuning bits during driver probe
diff mbox

Message ID 1468309584-3591-16-git-send-email-aisheng.dong@nxp.com
State New
Headers show

Commit Message

Aisheng Dong July 12, 2016, 7:46 a.m. UTC
The tuning bits like FBCLK_SEL, SMP_CLK_SEL and DLY_CELL which affects
timing may have already been set by ROM if booting from SD3.0 mode like
SDR104. Let's clear it first during driver probe before doing the new
card enumeration to avoid working on the wrong timing.

Note that tuning bits are dynamical settings which may need to be kept
during MMC_PM_KEEP_POWER suspend, so we did not put them into hwinit
function.

Signed-off-by: Dong Aisheng <aisheng.dong@nxp.com>
---
 drivers/mmc/host/sdhci-esdhc-imx.c | 5 +++++
 1 file changed, 5 insertions(+)

Comments

Adrian Hunter July 21, 2016, 8:33 a.m. UTC | #1
On 12/07/16 10:46, Dong Aisheng wrote:
> The tuning bits like FBCLK_SEL, SMP_CLK_SEL and DLY_CELL which affects
> timing may have already been set by ROM if booting from SD3.0 mode like
> SDR104. Let's clear it first during driver probe before doing the new
> card enumeration to avoid working on the wrong timing.
> 
> Note that tuning bits are dynamical settings which may need to be kept
> during MMC_PM_KEEP_POWER suspend, so we did not put them into hwinit
> function.
> 
> Signed-off-by: Dong Aisheng <aisheng.dong@nxp.com>


Acked-by: Adrian Hunter <adrian.hunter@intel.com>


> ---
>  drivers/mmc/host/sdhci-esdhc-imx.c | 5 +++++
>  1 file changed, 5 insertions(+)
> 
> diff --git a/drivers/mmc/host/sdhci-esdhc-imx.c b/drivers/mmc/host/sdhci-esdhc-imx.c
> index e5b5d1c3eb01..2bb326bbc34a 100644
> --- a/drivers/mmc/host/sdhci-esdhc-imx.c
> +++ b/drivers/mmc/host/sdhci-esdhc-imx.c
> @@ -1224,6 +1224,11 @@ static int sdhci_esdhc_imx_probe(struct platform_device *pdev)
>  		host->mmc->caps |= MMC_CAP_1_8V_DDR;
>  		if (!(imx_data->socdata->flags & ESDHC_FLAG_HS200))
>  			host->quirks2 |= SDHCI_QUIRK2_BROKEN_HS200;
> +
> +		/* clear tuning bits in case ROM has set it already */
> +		writel(0x0, host->ioaddr + ESDHC_MIX_CTRL);
> +		writel(0x0, host->ioaddr + SDHCI_ACMD12_ERR);
> +		writel(0x0, host->ioaddr + ESDHC_TUNE_CTRL_STATUS);
>  	}
>  
>  	if (imx_data->socdata->flags & ESDHC_FLAG_MAN_TUNING)
> 

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Patch
diff mbox

diff --git a/drivers/mmc/host/sdhci-esdhc-imx.c b/drivers/mmc/host/sdhci-esdhc-imx.c
index e5b5d1c3eb01..2bb326bbc34a 100644
--- a/drivers/mmc/host/sdhci-esdhc-imx.c
+++ b/drivers/mmc/host/sdhci-esdhc-imx.c
@@ -1224,6 +1224,11 @@  static int sdhci_esdhc_imx_probe(struct platform_device *pdev)
 		host->mmc->caps |= MMC_CAP_1_8V_DDR;
 		if (!(imx_data->socdata->flags & ESDHC_FLAG_HS200))
 			host->quirks2 |= SDHCI_QUIRK2_BROKEN_HS200;
+
+		/* clear tuning bits in case ROM has set it already */
+		writel(0x0, host->ioaddr + ESDHC_MIX_CTRL);
+		writel(0x0, host->ioaddr + SDHCI_ACMD12_ERR);
+		writel(0x0, host->ioaddr + ESDHC_TUNE_CTRL_STATUS);
 	}
 
 	if (imx_data->socdata->flags & ESDHC_FLAG_MAN_TUNING)