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mmc: sdhci: add a quirk to define non standard tuning

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Some controllers need SW to compare the data received
from the card for a tuning command. Add a quirk for
such non standard controllers so that they can read
the data from the controller using ADMA/PIO and do the
tuning sequence from SW to determine the appropriate phase.

Change-Id: I15edfdf0442e3ac678c70df29482b3304cf1215a
Signed-off-by: Sahitya Tummala <stummala@codeaurora.org>
This commit is contained in:
Sahitya Tummala 2016-04-01 14:29:22 +05:30 committed by Gerrit - the friendly Code Review server
parent ed0562e7de
commit 65c147711b
2 changed files with 10 additions and 3 deletions
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7
drivers/mmc/host/sdhci.c
View file

@ -3160,9 +3160,10 @@ static void sdhci_data_irq(struct sdhci_host *host, u32 intmask)
/* CMD19 generates _only_ Buffer Read Ready interrupt */
if (intmask & SDHCI_INT_DATA_AVAIL) {
if (command == MMC_SEND_TUNING_BLOCK ||
command == MMC_SEND_TUNING_BLOCK_HS200 ||
command == MMC_SEND_TUNING_BLOCK_HS400) {
if (!(host->quirks2 & SDHCI_QUIRK2_NON_STANDARD_TUNING) &&
(command == MMC_SEND_TUNING_BLOCK ||
command == MMC_SEND_TUNING_BLOCK_HS200 ||
command == MMC_SEND_TUNING_BLOCK_HS400)) {
host->tuning_done = 1;
wake_up(&host->buf_ready_int);
return;

6
include/linux/mmc/sdhci.h
View file

@ -191,6 +191,12 @@ struct sdhci_host {
#define SDHCI_QUIRK2_BROKEN_LED_CONTROL (1 << 14)
/* Use reset workaround in case sdhci reset timeouts */
#define SDHCI_QUIRK2_USE_RESET_WORKAROUND (1 << 15)
/*
* Some controllers doesn't follow the tuning procedure as defined in spec.
* The tuning data has to be compared from SW driver to validate the correct
* phase.
*/
#define SDHCI_QUIRK2_NON_STANDARD_TUNING (1 << 16)
int irq; /* Device IRQ */
void __iomem *ioaddr; /* Mapped address */