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mmc: core: Add workaround for hosts that need addtional tuning for HS400

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Add a capability to identify hosts that need additional tuning for HS400
and perform a post tuning process that maybe needed for proper HS400
functionality.

Change-Id: I3895aabddce4dbecb208e3c522957e656f37e30d
Signed-off-by: Venkat Gopalakrishnan <venkatg@codeaurora.org>
[subhashj@codeaurora.org: fixed trivial merge conflicts]
Signed-off-by: Subhash Jadavani <subhashj@codeaurora.org>
This commit is contained in:
Venkat Gopalakrishnan 2015-01-09 15:11:57 -08:00 • committed by Subhash Jadavani
parent 34e4cf13f7
commit 58821ee5f6
2 changed files with 13 additions and 0 deletions
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11
drivers/mmc/core/mmc.c
View file

@ -1139,6 +1139,17 @@ static int mmc_select_hs400(struct mmc_card *card)
goto out_err;
}
if ((host->caps2 & MMC_CAP2_HS400_POST_TUNING) && host->ops->execute_tuning) {
mmc_host_clk_hold(host);
err = host->ops->execute_tuning(host,
MMC_SEND_TUNING_BLOCK_HS200);
mmc_host_clk_release(host);
if (err)
pr_warn("%s: tuning execution failed\n",
mmc_hostname(host));
}
return 0;
out_err:

2
include/linux/mmc/host.h
View file

@ -318,6 +318,8 @@ struct mmc_host {
#define MMC_CAP2_CLK_SCALE (1 << 20) /* Allow dynamic clk scaling */
/* Allows Asynchronous SDIO irq while card is in 4-bit mode */
#define MMC_CAP2_ASYNC_SDIO_IRQ_4BIT_MODE (1 << 21)
/* Some hosts need additional tuning */
#define MMC_CAP2_HS400_POST_TUNING (1 << 22)
#define MMC_CAP2_NONHOTPLUG (1 << 25) /*Don't support hotplug*/
mmc_pm_flag_t pm_caps; /* supported pm features */