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mmc: sdhci-msm: Factor out sdhci_msm_hs400

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Factor out sdhci_msm_hs400 used for DLL calibration in HS400
modes. This function will be needed for enhanced_strobe as well.

Signed-off-by: Ritesh Harjani <riteshh@codeaurora.org>
Tested-by: Jeremy McNicoll <jeremymc@redhat.com>
Acked-by: Adrian Hunter <adrian.hunter@intel.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This commit is contained in:
Ritesh Harjani 2017-01-10 12:30:47 +05:30 committed by Ulf Hansson
parent 0fb8a3d46b
commit db9bd16381
1 changed files with 26 additions and 6 deletions
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32
drivers/mmc/host/sdhci-msm.c
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@ -884,6 +884,28 @@ retry:
return rc; return rc;
} }
/*
* sdhci_msm_hs400 - Calibrate the DLL for HS400 bus speed mode operation.
* DLL operation is only needed for clock > 100MHz. For clock <= 100MHz
* fixed feedback clock is used.
*/
static void sdhci_msm_hs400(struct sdhci_host *host, struct mmc_ios *ios)
{
struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
struct sdhci_msm_host *msm_host = sdhci_pltfm_priv(pltfm_host);
int ret;
if (host->clock > CORE_FREQ_100MHZ &&
msm_host->tuning_done && !msm_host->calibration_done) {
ret = sdhci_msm_hs400_dll_calibration(host);
if (!ret)
msm_host->calibration_done = true;
else
pr_err("%s: Failed to calibrate DLL for hs400 mode (%d)\n",
mmc_hostname(host->mmc), ret);
}
}
static void sdhci_msm_set_uhs_signaling(struct sdhci_host *host, static void sdhci_msm_set_uhs_signaling(struct sdhci_host *host,
unsigned int uhs) unsigned int uhs)
{ {
@ -952,12 +974,10 @@ static void sdhci_msm_set_uhs_signaling(struct sdhci_host *host,
sdhci_writew(host, ctrl_2, SDHCI_HOST_CONTROL2); sdhci_writew(host, ctrl_2, SDHCI_HOST_CONTROL2);
spin_unlock_irq(&host->lock); spin_unlock_irq(&host->lock);
/* CDCLP533 HW calibration is only required for HS400 mode*/
if (host->clock > CORE_FREQ_100MHZ && if (mmc->ios.timing == MMC_TIMING_MMC_HS400)
msm_host->tuning_done && !msm_host->calibration_done && sdhci_msm_hs400(host, &mmc->ios);
mmc->ios.timing == MMC_TIMING_MMC_HS400)
if (!sdhci_msm_hs400_dll_calibration(host))
msm_host->calibration_done = true;
spin_lock_irq(&host->lock); spin_lock_irq(&host->lock);
} }