mmc: at91_mci: Enable MMC_CAP_SDIO_IRQ only when it actually works.

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>
Cc: Wolfgang Muees <wolfgang.mues@auerswald.de>
Cc: Andrew Victor <avictor.za@gmail.com>
Cc: <linux-mmc@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 8 insertions, 1 deletions

diff --git a/drivers/mmc/host/at91_mci.c b/drivers/mmc/host/at91_mci.c
index 3cd00c6f2584..8327daebb396 100644
--- a/drivers/mmc/host/at91_mci.c
+++ b/drivers/mmc/host/at91_mci.c
@@ -929,7 +929,7 @@ 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  = MCI_MAXBLKSIZE;
         mmc->max_blk_count = MCI_BLKATONCE;
@@ -958,6 +958,13 @@ static int __init at91_mci_probe(struct platform_device *pdev)
                 goto fail5;
         }
 
+        /* 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)