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| author | cmachida <curtis.machida@intel.com> | 2024-04-12 12:26:40 -0700 |
|---|---|---|
| committer | Jaehoon Chung <jh80.chung@samsung.com> | 2024-04-26 15:31:57 +0900 |
| commit | 9ae1fe1a5848b48c42ef9ebe4d4a6928ee336afd (patch) | |
| tree | ece0e0d95c9c9789764afdf364eaf4d0f8ef17a5 /drivers/mmc/sdhci.c | |
| parent | 4d3dc72165486c88214fbcaa9742ce7dee9693b3 (diff) | |
| download | u-boot-9ae1fe1a5848b48c42ef9ebe4d4a6928ee336afd.tar.gz u-boot-9ae1fe1a5848b48c42ef9ebe4d4a6928ee336afd.tar.bz2 u-boot-9ae1fe1a5848b48c42ef9ebe4d4a6928ee336afd.zip | |
mmc: sdhci: programmable clock calculation needs multiplier +1
According to the SD Host Controller Simplified Specification v4.20,
the multiplier value M is one more than the Clock Multiplier field.
Copied code from Linux project. drivers/mmc/host/sdhci.c line 4405
Signed-off-by: cmachida <curtis.machida@intel.com>
Reviewed-by: Jaehoon Chung <jh80.chung@samsung.com>
Reviewed-by: Sean Anderson <sean.anderson@seco.com>
Diffstat (limited to 'drivers/mmc/sdhci.c')
| -rw-r--r-- | drivers/mmc/sdhci.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/drivers/mmc/sdhci.c b/drivers/mmc/sdhci.c index ceeac32882..af654ea8d1 100644 --- a/drivers/mmc/sdhci.c +++ b/drivers/mmc/sdhci.c @@ -930,6 +930,15 @@ int sdhci_setup_cfg(struct mmc_config *cfg, struct sdhci_host *host, debug("%s, caps_1: 0x%x\n", __func__, caps_1); host->clk_mul = (caps_1 & SDHCI_CLOCK_MUL_MASK) >> SDHCI_CLOCK_MUL_SHIFT; + + /* + * In case the value in Clock Multiplier is 0, then programmable + * clock mode is not supported, otherwise the actual clock + * multiplier is one more than the value of Clock Multiplier + * in the Capabilities Register. + */ + if (host->clk_mul) + host->clk_mul += 1; } if (host->max_clk == 0) { |