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mmc: sdhci-msm: Don't enable PWRSAVE_DLL for certain sdhc hosts

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SDHC core with new 14lpp and later tech DLL should not enable
PWRSAVE_DLL since such controller's internal gating cannot meet
following MCLK requirement:
When MCLK is gated OFF, it is not gated for less than 0.5us and MCLK
must be switched on for at-least 1us before DATA starts coming.

Adding support for this requirement.

Signed-off-by: Ritesh Harjani <riteshh@codeaurora.org>
Signed-off-by: Veerabhadrarao Badiganti <vbadigan@codeaurora.org>
Reviewed-by: Can Guo <cang@codeaurora.org>
Acked-by: Adrian Hunter <adrian.hunter@intel.com>
Link: https://lore.kernel.org/r/1581077075-26011-1-git-send-email-vbadigan@codeaurora.org
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This commit is contained in:
Ritesh Harjani 2020-02-07 17:34:28 +05:30 committed by Ulf Hansson
parent 2a2b821607
commit 219c02ca1c
1 changed files with 15 additions and 3 deletions
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18
drivers/mmc/host/sdhci-msm.c
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@ -977,9 +977,21 @@ static int sdhci_msm_cm_dll_sdc4_calibration(struct sdhci_host *host)
goto out;
}
config = readl_relaxed(host->ioaddr + msm_offset->core_vendor_spec3);
config |= CORE_PWRSAVE_DLL;
writel_relaxed(config, host->ioaddr + msm_offset->core_vendor_spec3);
/*
* Set CORE_PWRSAVE_DLL bit in CORE_VENDOR_SPEC3.
* When MCLK is gated OFF, it is not gated for less than 0.5us
* and MCLK must be switched on for at-least 1us before DATA
* starts coming. Controllers with 14lpp and later tech DLL cannot
* guarantee above requirement. So PWRSAVE_DLL should not be
* turned on for host controllers using this DLL.
*/
if (!msm_host->use_14lpp_dll_reset) {
config = readl_relaxed(host->ioaddr +
msm_offset->core_vendor_spec3);
config |= CORE_PWRSAVE_DLL;
writel_relaxed(config, host->ioaddr +
msm_offset->core_vendor_spec3);
}
/*
* Drain writebuffer to ensure above DLL calibration