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mmc: sdhci: programmable clock calculation needs multiplier +1

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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>
This commit is contained in:
cmachida
2024-04-12 12:26:40 -07:00
committed by Jaehoon Chung
parent 4d3dc72165
commit 9ae1fe1a58
1 changed files with 9 additions and 0 deletions
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9
drivers/mmc/sdhci.c
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@@ -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) {