mmc: sdhci: allow for eMMC 74 clock generation by controller
Snippet of code for how adaptation layer should handle the call: /* * eMMC spec calls for the host to send 74 clocks to the card * during initialization, right after voltage stabilization. * create the clocks manually right here. */ void generate_init_clocks_A0(struct sdhci_host *host, u8 power_mode) { struct sdhci_mmc_slot *slot = sdhci_priv(host); if (slot->power_mode == MMC_POWER_UP && power_mode == MMC_POWER_ON) { /* controller specific code here */ /* slot->power_mode holds previous power setting */ } slot->power_mode = power_mode; } Signed-off-by: Philip Rakity <prakity@marvell.com> Signed-off-by: Chris Ball <cjb@laptop.org>
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@ -1182,6 +1182,9 @@ static void sdhci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
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else
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sdhci_set_power(host, ios->vdd);
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if (host->ops->platform_send_init_74_clocks)
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host->ops->platform_send_init_74_clocks(host, ios->power_mode);
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ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL);
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if (ios->bus_width == MMC_BUS_WIDTH_8)
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@ -212,6 +212,8 @@ struct sdhci_ops {
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unsigned int (*get_max_clock)(struct sdhci_host *host);
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unsigned int (*get_min_clock)(struct sdhci_host *host);
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unsigned int (*get_timeout_clock)(struct sdhci_host *host);
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void (*platform_send_init_74_clocks)(struct sdhci_host *host,
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u8 power_mode);
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};
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#ifdef CONFIG_MMC_SDHCI_IO_ACCESSORS
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