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mmc: sdhci-msm: Factor out function to set/get msm clock rate 

Factor out msm_set/get_clock_rate_for_bus_mode for it's later
use in changing the tuning sequence for selecting HS400
bus speed mode.

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 12:30:46 +05:30 committed by Ulf Hansson
parent b54aaa8a4f
commit 0fb8a3d46b
1 changed files with 40 additions and 24 deletions
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64
drivers/mmc/host/sdhci-msm.c
View File

@ -138,6 +138,45 @@ struct sdhci_msm_host {
bool use_cdclp533;
};
static unsigned int msm_get_clock_rate_for_bus_mode(struct sdhci_host *host,
unsigned int clock)
{
struct mmc_ios ios = host->mmc->ios;
/*
* 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 (ios.timing == MMC_TIMING_UHS_DDR50 ||
ios.timing == MMC_TIMING_MMC_DDR52 ||
ios.timing == MMC_TIMING_MMC_HS400)
clock *= 2;
return clock;
}
static void msm_set_clock_rate_for_bus_mode(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;
clock = msm_get_clock_rate_for_bus_mode(host, clock);
rc = clk_set_rate(msm_host->clk, clock);
if (rc) {
pr_err("%s: Failed to set clock at rate %u at timing %d\n",
mmc_hostname(host->mmc), clock,
curr_ios.timing);
return;
}
msm_host->clk_rate = clock;
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);
}
/* Platform specific tuning */
static inline int msm_dll_poll_ck_out_en(struct sdhci_host *host, u8 poll)
{
@ -1006,8 +1045,6 @@ 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) {
msm_host->clk_rate = clock;
@ -1015,32 +1052,11 @@ 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;
sdhci_msm_hc_select_mode(host);
rc = clk_set_rate(msm_host->clk, clock);
if (rc) {
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 at timing %d\n",
mmc_hostname(host->mmc), clk_get_rate(msm_host->clk),
curr_ios.timing);
msm_set_clock_rate_for_bus_mode(host, clock);
out_lock:
spin_lock_irq(&host->lock);
out:
__sdhci_msm_set_clock(host, clock);