Hi, On Wed, Apr 23, 2014 at 08:07:57PM +0100, Russell King wrote: > Patch suggested by Dong Aisheng <donga...@gmail.com>, this avoids > additional clock start/stop cycles during the transition to 1.8V > signalling mode. > > Signed-off-by: Russell King <rmk+ker...@arm.linux.org.uk>
I tested the series on imx6s with a RIoT board. With this patch applied
the RIoT board emmc does not work. Here is the output of the board:
# dmesg | grep mmc2
mmc2: no vqmmc regulator found
mmc2: no vmmc regulator found
mmc2: SDHCI controller on 219c000.usdhc [219c000.usdhc] using ADMA
mmc2: BKOPS_EN bit is not set
mmc2: Timeout waiting for hardware interrupt.
mmc2: Timeout waiting for hardware interrupt.
mmc2: Timeout waiting for hardware interrupt.
mmc2: Timeout waiting for hardware interrupt.
mmc2: error -110 whilst initialising MMC card
mmc2: BKOPS_EN bit is not set
mmc2: Timeout waiting for hardware interrupt.
mmc2: Timeout waiting for hardware interrupt.
mmc2: Timeout waiting for hardware interrupt.
mmc2: Timeout waiting for hardware interrupt.
mmc2: error -110 whilst initialising MMC card
mmc2: BKOPS_EN bit is not set
Any ideas?
Regards,
Markus
> ---
> drivers/mmc/host/sdhci.c | 12 ------------
> 1 file changed, 12 deletions(-)
>
> diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
> index 748333ba6e96..0bcef2d42da4 100644
> --- a/drivers/mmc/host/sdhci.c
> +++ b/drivers/mmc/host/sdhci.c
> @@ -1507,12 +1507,6 @@ static void sdhci_do_set_ios(struct sdhci_host *host,
> struct mmc_ios *ios)
> host->ops->set_clock(host, host->clock);
> }
>
> -
> - /* Reset SD Clock Enable */
> - clk = sdhci_readw(host, SDHCI_CLOCK_CONTROL);
> - clk &= ~SDHCI_CLOCK_CARD_EN;
> - sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL);
> -
> if (host->ops->set_uhs_signaling)
> host->ops->set_uhs_signaling(host, ios->timing);
> else {
> @@ -1546,9 +1540,6 @@ static void sdhci_do_set_ios(struct sdhci_host *host,
> struct mmc_ios *ios)
> ios->drv_type = (preset & SDHCI_PRESET_DRV_MASK)
> >> SDHCI_PRESET_DRV_SHIFT;
> }
> -
> - /* Re-enable SD Clock */
> - host->ops->set_clock(host, host->clock);
> } else
> sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
>
> @@ -1757,9 +1748,6 @@ static int sdhci_do_start_signal_voltage_switch(struct
> sdhci_host *host,
> ctrl |= SDHCI_CTRL_VDD_180;
> sdhci_writew(host, ctrl, SDHCI_HOST_CONTROL2);
>
> - /* Wait for 5ms */
> - usleep_range(5000, 5500);
> -
> /* 1.8V regulator output should be stable within 5 ms */
> ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2);
> if (ctrl & SDHCI_CTRL_VDD_180)
> --
> 1.8.3.1
>
>
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>
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