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sdhci: implement CAP_CLOCK_BASE_BROKEN quirk
Some hosts (e.g. as found in CNS3xxx SOCs) report wrong value in CLOCK_BASE capability field, and currently there is no way to force the SDHCI core to use the platform-provided base clock value. This patch implements CAP_CLOCK_BASE_BROKEN quirk. When enabled, the SDHCI core will always use base clock frequency provided by the platform. Signed-off-by: Anton Vorontsov <avorontsov@ru.mvista.com> Cc: Richard Röjfors <richard.rojfors@pelagicore.com> Cc: David Vrabel <david.vrabel@csr.com> Cc: Pierre Ossman <pierre@ossman.eu> Cc: Ben Dooks <ben@simtec.co.uk> Cc: <linux-mmc@vger.kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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2 changed files with 4 additions and 1 deletions
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@ -1744,7 +1744,8 @@ int sdhci_add_host(struct sdhci_host *host)
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host->max_clk =
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(caps & SDHCI_CLOCK_BASE_MASK) >> SDHCI_CLOCK_BASE_SHIFT;
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host->max_clk *= 1000000;
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if (host->max_clk == 0) {
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if (host->max_clk == 0 || host->quirks &
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SDHCI_QUIRK_CAP_CLOCK_BASE_BROKEN) {
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if (!host->ops->get_max_clock) {
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printk(KERN_ERR
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"%s: Hardware doesn't specify base clock "
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@ -236,6 +236,8 @@ struct sdhci_host {
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#define SDHCI_QUIRK_DELAY_AFTER_POWER (1<<23)
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/* Controller uses SDCLK instead of TMCLK for data timeouts */
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#define SDHCI_QUIRK_DATA_TIMEOUT_USES_SDCLK (1<<24)
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/* Controller reports wrong base clock capability */
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#define SDHCI_QUIRK_CAP_CLOCK_BASE_BROKEN (1<<25)
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int irq; /* Device IRQ */
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void __iomem * ioaddr; /* Mapped address */
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