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mmc: sdio: add a quirk for broken SDIO_CCCR_INTx polling

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Polling SDIO_CCCR_INTx could create a fake interrupt with Marvell
SD8797 card. Add a quirk to handle this case. The fixup here is
to issue a dummy CMD52 read to function 0 register 0xff, and this
dummy read must be right after SDIO_CCCR_INTx is read.

Patch has been verified on a dw_mmc controller (Samsung Chromebook)
with MMC_CAP_SDIO_IRQ disabled.

Signed-off-by: Bing Zhao <bzhao@marvell.com>
Reviewed-by: Paul Stewart <pstew@chromium.org>
Reviewed-by: Doug Anderson <dianders@chromium.org>
Acked-by: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: Chris Ball <chris@printf.net>
This commit is contained in:
Bing Zhao
2013-11-26 15:39:20 -08:00
committed by Chris Ball
parent 2b35bd8346
commit e5624054c1
3 changed files with 26 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files

8
drivers/mmc/core/quirks.c
View File

@@ -13,6 +13,7 @@
#include <linux/kernel.h>
#include <linux/export.h>
#include <linux/mmc/card.h>
#include <linux/mmc/sdio_ids.h>
#ifndef SDIO_VENDOR_ID_TI
#define SDIO_VENDOR_ID_TI 0x0097
@@ -30,6 +31,10 @@
#define SDIO_DEVICE_ID_STE_CW1200 0x2280
#endif
#ifndef SDIO_DEVICE_ID_MARVELL_8797_F0
#define SDIO_DEVICE_ID_MARVELL_8797_F0 0x9128
#endif
/*
* This hook just adds a quirk for all sdio devices
*/
@@ -58,6 +63,9 @@ static const struct mmc_fixup mmc_fixup_methods[] = {
SDIO_FIXUP(SDIO_VENDOR_ID_STE, SDIO_DEVICE_ID_STE_CW1200,
add_quirk, MMC_QUIRK_BROKEN_BYTE_MODE_512),
SDIO_FIXUP(SDIO_VENDOR_ID_MARVELL, SDIO_DEVICE_ID_MARVELL_8797_F0,
add_quirk, MMC_QUIRK_BROKEN_IRQ_POLLING),
END_FIXUP
};

11
drivers/mmc/core/sdio_irq.c
View File

@@ -53,6 +53,17 @@ static int process_sdio_pending_irqs(struct mmc_host *host)
return ret;
}
if (pending && mmc_card_broken_irq_polling(card) &&
!(host->caps & MMC_CAP_SDIO_IRQ)) {
unsigned char dummy;
/* A fake interrupt could be created when we poll SDIO_CCCR_INTx
* register with a Marvell SD8797 card. A dummy CMD52 read to
* function 0 register 0xff can avoid this.
*/
mmc_io_rw_direct(card, 0, 0, 0xff, 0, &dummy);
}
count = 0;
for (i = 1; i <= 7; i++) {
if (pending & (1 << i)) {