[PATCH 1/3] at91_mci: Enable MMC_CAP_SDIO_IRQ only when it actually works

[Nicolas Ferre <nicolas.ferre@atmel.com>]

According to the datasheets AT91SAM9261 does not support
SDIO interrupts, and AT91SAM9260/9263 have an erratum
requiring 4bit mode while using slot B for the interrupt
to work.

Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>
---
Original patch from Ville Syrjala.
I removed the rm9200 from the original patch as this chip is not
SDIO capable (error in datasheet).

 drivers/mmc/host/at91_mci.c |    9 ++++++++-
 1 files changed, 8 insertions(+), 1 deletions(-)

diff --git a/drivers/mmc/host/at91_mci.c b/drivers/mmc/host/at91_mci.c
index 59bf71e..f3d725e 100644
--- a/drivers/mmc/host/at91_mci.c
+++ b/drivers/mmc/host/at91_mci.c
@@ -1000,7 +1000,7 @@ static int __init at91_mci_probe(struct platform_device *pdev)
 	mmc->f_min = 375000;
 	mmc->f_max = 25000000;
 	mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34;
-	mmc->caps = MMC_CAP_SDIO_IRQ;
+	mmc->caps = 0;
 
 	mmc->max_blk_size = 4095;
 	mmc->max_blk_count = mmc->max_req_size;
@@ -1018,6 +1018,13 @@ static int __init at91_mci_probe(struct platform_device *pdev)
 				" - using 1 wire\n");
 	}
 
+	/* Add SDIO capability when  available */
+	if (cpu_is_at91sam9260() || cpu_is_at91sam9263()) {
+		/* AT91SAM9260/9263 erratum */
+		if (host->board->wire4 || !host->board->slot_b)
+			mmc->caps |= MMC_CAP_SDIO_IRQ;
+	}
+
 	/*
 	 * Reserve GPIOs ... board init code makes sure these pins are set
 	 * up as GPIOs with the right direction (input, except for vcc)
-- 
1.5.3.7