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Commit e67f65c3 authored Apr 01, 2016 by Sahitya Tummala

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



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>

parent 5cee81b6

drivers/mmc/host/sdhci.c

+3 −2

Original line number	Diff line number	Diff line
		@@ -2927,8 +2927,9 @@ 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) {
		if (!(host->quirks2 & SDHCI_QUIRK2_NON_STANDARD_TUNING) &&
		(command == MMC_SEND_TUNING_BLOCK \|\|
		command == MMC_SEND_TUNING_BLOCK_HS200)) {
		host->tuning_done = 1;
		wake_up(&host->buf_ready_int);
		return;

include/linux/mmc/sdhci.h

+6 −0

Original line number	Diff line number	Diff line
		@@ -181,6 +181,12 @@ struct sdhci_host {
		#define SDHCI_QUIRK2_USE_RESET_WORKAROUND (1<<20)
		/* Some controllers doesn't have have any LED control */
		#define SDHCI_QUIRK2_BROKEN_LED_CONTROL (1<<21)
		/*
		* 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 << 22)

		int irq; /* Device IRQ */
		void __iomem ioaddr; / Mapped address */