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>

diff --git a/drivers/mmc/host/sdhci-msm.c b/drivers/mmc/host/sdhci-msm.c
index 84d29dd..fa9bce3 100644 (file)
--- a/drivers/mmc/host/sdhci-msm.c
+++ b/drivers/mmc/host/sdhci-msm.c
@@ -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);