mmc: SDHC 3.0: correct f_min calculation for SD 3.0 spec
While we're at it, add symbols for SDHCI_MAX_DIV_SPEC_{200,300}. Signed-off-by: Zhangfei Gao <zhangfei.gao@marvell.com> Signed-off-by: Chris Ball <cjb@laptop.org>
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2 changed files with 12 additions and 3 deletions
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@ -1006,14 +1006,14 @@ static void sdhci_set_clock(struct sdhci_host *host, unsigned int clock)
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if (host->max_clk <= clock)
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div = 1;
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else {
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for (div = 2; div < 2046; div += 2) {
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for (div = 2; div < SDHCI_MAX_DIV_SPEC_300; div += 2) {
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if ((host->max_clk / div) <= clock)
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break;
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}
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}
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} else {
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/* Version 2.00 divisors must be a power of 2. */
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for (div = 1; div < 256; div *= 2) {
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for (div = 1; div < SDHCI_MAX_DIV_SPEC_200; div *= 2) {
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if ((host->max_clk / div) <= clock)
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break;
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}
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@ -1835,8 +1835,10 @@ int sdhci_add_host(struct sdhci_host *host)
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mmc->ops = &sdhci_ops;
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if (host->ops->get_min_clock)
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mmc->f_min = host->ops->get_min_clock(host);
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else if (host->version >= SDHCI_SPEC_300)
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mmc->f_min = host->max_clk / SDHCI_MAX_DIV_SPEC_300;
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else
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mmc->f_min = host->max_clk / 256;
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mmc->f_min = host->max_clk / SDHCI_MAX_DIV_SPEC_200;
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mmc->f_max = host->max_clk;
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mmc->caps |= MMC_CAP_SDIO_IRQ;
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@ -185,6 +185,13 @@
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#define SDHCI_SPEC_200 1
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#define SDHCI_SPEC_300 2
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/*
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* End of controller registers.
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*/
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#define SDHCI_MAX_DIV_SPEC_200 256
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#define SDHCI_MAX_DIV_SPEC_300 2046
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struct sdhci_ops;
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struct sdhci_host {
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