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mmc: sdhci-msm: Make HS400 tuning follow as per recommeneded HW sequence 

During tuning execution for HS400 mode, HW sequence recommends
to select MCLK_SEL/2(0x3) in VENDOR_SPEC & sdhc msm clock at GCC
to be 400MHZ (nearest supported clk). Add this change in tuning
sequence during HS400 tuning.

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 12:30:51 +05:30 committed by Ulf Hansson
parent 8a8fa8797c
commit d7507aa1b9
1 changed files with 14 additions and 2 deletions
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16
drivers/mmc/host/sdhci-msm.c
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@ -151,7 +151,8 @@ static unsigned int msm_get_clock_rate_for_bus_mode(struct sdhci_host *host,
*/
if (ios.timing == MMC_TIMING_UHS_DDR50 ||
ios.timing == MMC_TIMING_MMC_DDR52 ||
ios.timing == MMC_TIMING_MMC_HS400)
ios.timing == MMC_TIMING_MMC_HS400 ||
host->flags & SDHCI_HS400_TUNING)
clock *= 2;
return clock;
}
@ -611,7 +612,8 @@ void sdhci_msm_hc_select_mode(struct sdhci_host *host)
{
struct mmc_ios ios = host->mmc->ios;
if (ios.timing == MMC_TIMING_MMC_HS400)
if (ios.timing == MMC_TIMING_MMC_HS400 ||
host->flags & SDHCI_HS400_TUNING)
msm_hc_select_hs400(host);
else
msm_hc_select_default(host);
@ -831,6 +833,16 @@ static int sdhci_msm_execute_tuning(struct sdhci_host *host, u32 opcode)
ios.timing == MMC_TIMING_UHS_SDR104))
return 0;
/*
* For HS400 tuning in HS200 timing requires:
* - select MCLK/2 in VENDOR_SPEC
* - program MCLK to 400MHz (or nearest supported) in GCC
*/
if (host->flags & SDHCI_HS400_TUNING) {
sdhci_msm_hc_select_mode(host);
msm_set_clock_rate_for_bus_mode(host, ios.clock);
}
retry:
/* First of all reset the tuning block */
rc = msm_init_cm_dll(host);