From: cmachida Date: Fri, 12 Apr 2024 19:26:40 +0000 (-0700) Subject: mmc: sdhci: programmable clock calculation needs multiplier +1 X-Git-Url: http://git.dujemihanovic.xyz/%22http:/www.sics.se/static/git-logo.png?a=commitdiff_plain;h=9ae1fe1a5848b48c42ef9ebe4d4a6928ee336afd;p=u-boot.git 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 Reviewed-by: Jaehoon Chung Reviewed-by: Sean Anderson --- 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) {