diff options
| author | Faiz Abbas <faiz_abbas@ti.com> | 2019-04-01 15:58:04 +0300 |
|---|---|---|
| committer | Ulf Hansson <ulf.hansson@linaro.org> | 2019-04-15 12:55:54 +0300 |
| commit | e374e87538f4c7cd364bce6b9048ad5829ccc604 (patch) | |
| tree | a0004296e8224632bf68fc376b527b05ff9f980f /drivers/mmc/host/sdhci_am654.c | |
| parent | 3b407b4f3a9273467a6b3d6a640948a739794950 (diff) | |
| download | linux-e374e87538f4c7cd364bce6b9048ad5829ccc604.tar.xz | |
mmc: sdhci_am654: Clear HISPD_ENA in some lower speed modes
According to the AM654x Data Manual[1], the setup timing in lower speed
modes can only be met if the controller uses a falling edge data launch.
To ensure this, the HIGH_SPEED_ENA (HOST_CONTROL[2]) bit should be
cleared in default speed, SD high speed, MMC high speed, SDR12 and SDR25
speed modes.
Use the sdhci writeb callback to implement this condition.
[1] http://www.ti.com/lit/gpn/am6546 Section 5.10.5.16.1
Signed-off-by: Faiz Abbas <faiz_abbas@ti.com>
Acked-by: Adrian Hunter <adrian.hunter@intel.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Diffstat (limited to 'drivers/mmc/host/sdhci_am654.c')
| -rw-r--r-- | drivers/mmc/host/sdhci_am654.c | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/drivers/mmc/host/sdhci_am654.c b/drivers/mmc/host/sdhci_am654.c index eea183e90f1b..a91c0b45c48d 100644 --- a/drivers/mmc/host/sdhci_am654.c +++ b/drivers/mmc/host/sdhci_am654.c @@ -158,6 +158,27 @@ static void sdhci_am654_set_power(struct sdhci_host *host, unsigned char mode, sdhci_set_power_noreg(host, mode, vdd); } +static void sdhci_am654_write_b(struct sdhci_host *host, u8 val, int reg) +{ + unsigned char timing = host->mmc->ios.timing; + + if (reg == SDHCI_HOST_CONTROL) { + switch (timing) { + /* + * According to the data manual, HISPD bit + * should not be set in these speed modes. + */ + case MMC_TIMING_SD_HS: + case MMC_TIMING_MMC_HS: + case MMC_TIMING_UHS_SDR12: + case MMC_TIMING_UHS_SDR25: + val &= ~SDHCI_CTRL_HISPD; + } + } + + writeb(val, host->ioaddr + reg); +} + static struct sdhci_ops sdhci_am654_ops = { .get_max_clock = sdhci_pltfm_clk_get_max_clock, .get_timeout_clock = sdhci_pltfm_clk_get_max_clock, @@ -165,6 +186,7 @@ static struct sdhci_ops sdhci_am654_ops = { .set_bus_width = sdhci_set_bus_width, .set_power = sdhci_am654_set_power, .set_clock = sdhci_am654_set_clock, + .write_b = sdhci_am654_write_b, .reset = sdhci_reset, }; |