diff options
author | Ritesh Harjani <riteshh@codeaurora.org> | 2016-11-21 09:37:21 +0300 |
---|---|---|
committer | Ulf Hansson <ulf.hansson@linaro.org> | 2016-11-29 11:05:17 +0300 |
commit | b12d44db4b0187f536c487713ef39a22da990635 (patch) | |
tree | 8cc3c51f4d367633fe1a3fc80d8630e5f961d73f /drivers/mmc | |
parent | edc609fd19e1cd1b6d0125915195a28c107a293b (diff) | |
download | linux-b12d44db4b0187f536c487713ef39a22da990635.tar.xz |
mmc: sdhci-msm: Add clock changes for DDR mode.
SDHC MSM controller need 2x clock for MCLK at GCC.
Hence make required changes to have 2x clock for
DDR timing modes.
Signed-off-by: Ritesh Harjani <riteshh@codeaurora.org>
Acked-by: Adrian Hunter <adrian.hunter@intel.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Diffstat (limited to 'drivers/mmc')
-rw-r--r-- | drivers/mmc/host/sdhci-msm.c | 21 |
1 files changed, 17 insertions, 4 deletions
diff --git a/drivers/mmc/host/sdhci-msm.c b/drivers/mmc/host/sdhci-msm.c index 00759efed312..c50cee87e6c0 100644 --- a/drivers/mmc/host/sdhci-msm.c +++ b/drivers/mmc/host/sdhci-msm.c @@ -610,6 +610,7 @@ static void sdhci_msm_set_clock(struct sdhci_host *host, unsigned int clock) { struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); struct sdhci_msm_host *msm_host = sdhci_pltfm_priv(pltfm_host); + struct mmc_ios curr_ios = host->mmc->ios; int rc; if (!clock) { @@ -618,16 +619,28 @@ static void sdhci_msm_set_clock(struct sdhci_host *host, unsigned int clock) } spin_unlock_irq(&host->lock); + /* + * The SDHC requires internal clock frequency to be double the + * actual clock that will be set for DDR mode. The controller + * uses the faster clock(100/400MHz) for some of its parts and + * send the actual required clock (50/200MHz) to the card. + */ + if (curr_ios.timing == MMC_TIMING_UHS_DDR50 || + curr_ios.timing == MMC_TIMING_MMC_DDR52 || + curr_ios.timing == MMC_TIMING_MMC_HS400) + clock *= 2; rc = clk_set_rate(msm_host->clk, clock); if (rc) { - pr_err("%s: Failed to set clock at rate %u\n", - mmc_hostname(host->mmc), clock); + pr_err("%s: Failed to set clock at rate %u at timing %d\n", + mmc_hostname(host->mmc), clock, + curr_ios.timing); goto out_lock; } msm_host->clk_rate = clock; - pr_debug("%s: Setting clock at rate %lu\n", - mmc_hostname(host->mmc), clk_get_rate(msm_host->clk)); + pr_debug("%s: Setting clock at rate %lu at timing %d\n", + mmc_hostname(host->mmc), clk_get_rate(msm_host->clk), + curr_ios.timing); out_lock: spin_lock_irq(&host->lock); |