[PATCH for 3.9 v3] mmc: mvsdio: fix non-DT probing of GPIOs

[Thomas Petazzoni]

Ralph Droms <rdroms at gmail.com> reported that 3.9-rc was breaking the
SDIO interface on his Sheevaplug platform, and that the recent changes
to the mvsdio driver are responsible for this breakage. Precisely, the
regression has been introduced by 07728b77c03d (mmc: mvsdio: use
slot-gpio for card detect gpio).

After investigation, is turns out that the Sheevaplug does not have
any "card detect" GPIO, and the Sheevaplug has not been converted to
the Device Tree. Therefore, the Sheevaplug board code does not define
a value for the .gpio_card_detect field of the mvsdio_platform_data
structure, which means that its value is 0. Unfortunately,
gpio_is_valid() considers 0 as a valid GPIO, and therefore calls
mmc_gpio_request_cd(), which fails and makes the entire probing of the
driver fail.

In fact, in the previous mvsdio code, before the Device Tree binding
was introduced, 0 was not considered as a valid GPIO. Therefore, this
fix revert back to this behavior in the non-DT case, by setting the
gpio_card_detect and gpio_write_protect local variables to -EINVAL
when the corresponding fields of the mvsdio_platform_data structure
are set to zero (i.e, left undefined). Of course, it prevents to use
GPIO 0 as a card detect or write protect GPIO, but it was a defiency
of the previous non-DT code, and the fix moving forward is to convert
platforms to the Device Tree.

The problem has been reproduced successfully on the Kirkwood-based
Marvell DB-88F6281-BP Development Board (that doesn't use the Device
Tree) and the fix has proven to work properly, after of course
removing the gpio_card_detect field of the mvsdio_platform_data
instance for this board.

Reported-by: Ralph Droms <rdroms at gmail.com>
Tested-by: Ralph Droms <rdroms at gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni at free-electrons.com>
---
This patch should be applied on 3.9-rcX.

Changes between v2 and v3:
 * Add a reference to the commit introducing the regression. Suggested
   by Russell King.
 * Fix the e-mail address from Ralph Droms, and add his Tested-by.
 * No code change.

Changes between v1 and v2:
 * Send the patch to the MMC maintainer instead of the Marvell
   maintainers.
---
 drivers/mmc/host/mvsdio.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/mmc/host/mvsdio.c b/drivers/mmc/host/mvsdio.c
index 145cdaf..1e4d567 100644
--- a/drivers/mmc/host/mvsdio.c
+++ b/drivers/mmc/host/mvsdio.c
@@ -741,8 +741,8 @@ static int __init mvsd_probe(struct platform_device *pdev)
 			goto out;
 		}
 		host->base_clock = mvsd_data->clock / 2;
-		gpio_card_detect = mvsd_data->gpio_card_detect;
-		gpio_write_protect = mvsd_data->gpio_write_protect;
+		gpio_card_detect = mvsd_data->gpio_card_detect ? : -EINVAL;
+		gpio_write_protect = mvsd_data->gpio_write_protect ? : -EINVAL;
 	}
 
 	mmc->ops = &mvsd_ops;
-- 
1.7.9.5