Wolfram,
I generated the patch for eMMC 74 clocks. I do not know if you want to incorporate into your submission or let it stand on its own.
regards,
Philip
From: Philip Rakity <prakity@xxxxxxxxxxx>
Subject: [PATCH] sdhci: allow for eMMC 74 clock generation by controller
Signed-off-by: Philip Rakity <prakity@xxxxxxxxxxx>
Patch is below and sample usage in sdhci-xxxx.c adaption code is below.
/*
* 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);
DBG ("%s: ENTER %s: slot->power_mode = %d, ios->power_mode = %d\n",
__func__,
mmc_hostname(host->mmc),
slot->power_mode,
power_mode);
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;
}
diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
index 401527d..6aadd0f 100644
--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c
@@ -1168,6 +1168,9 @@ static void sdhci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
else
sdhci_set_power(host, ios->vdd);
+ if (host->ops->platform_generate_initial_74_clocks)
+ host->ops->platform_generate_initial_74_clocks(host, ios->power_mode);
+
ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL);
if (ios->bus_width == MMC_BUS_WIDTH_8)
diff --git a/drivers/mmc/host/sdhci.h b/drivers/mmc/host/sdhci.h
index d316bc7..70c5806 100644
--- a/drivers/mmc/host/sdhci.h
+++ b/drivers/mmc/host/sdhci.h
@@ -323,6 +323,8 @@ struct sdhci_ops {
unsigned int (*get_max_clock)(struct sdhci_host *host);
unsigned int (*get_min_clock)(struct sdhci_host *host);
unsigned int (*get_timeout_clock)(struct sdhci_host *host);
+ void (*platform_generate_initial_74_clocks)(struct sdhci_host *host,
+ u8 power_mode);
};
#ifdef CONFIG_MMC_SDHCI_IO_ACCESSORS
--
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