mirror of
https://github.com/archlinuxarm/PKGBUILDs.git
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68 lines
2.8 KiB
Diff
68 lines
2.8 KiB
Diff
Ralph Droms <rdroms at gmail.com> reported that 3.9-rc was breaking the
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SDIO interface on his Sheevaplug platform, and that the recent changes
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to the mvsdio driver are responsible for this breakage. Precisely, the
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regression has been introduced by 07728b77c03d (mmc: mvsdio: use
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slot-gpio for card detect gpio).
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After investigation, is turns out that the Sheevaplug does not have
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any "card detect" GPIO, and the Sheevaplug has not been converted to
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the Device Tree. Therefore, the Sheevaplug board code does not define
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a value for the .gpio_card_detect field of the mvsdio_platform_data
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structure, which means that its value is 0. Unfortunately,
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gpio_is_valid() considers 0 as a valid GPIO, and therefore calls
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mmc_gpio_request_cd(), which fails and makes the entire probing of the
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driver fail.
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In fact, in the previous mvsdio code, before the Device Tree binding
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was introduced, 0 was not considered as a valid GPIO. Therefore, this
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fix revert back to this behavior in the non-DT case, by setting the
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gpio_card_detect and gpio_write_protect local variables to -EINVAL
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when the corresponding fields of the mvsdio_platform_data structure
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are set to zero (i.e, left undefined). Of course, it prevents to use
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GPIO 0 as a card detect or write protect GPIO, but it was a defiency
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of the previous non-DT code, and the fix moving forward is to convert
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platforms to the Device Tree.
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The problem has been reproduced successfully on the Kirkwood-based
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Marvell DB-88F6281-BP Development Board (that doesn't use the Device
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Tree) and the fix has proven to work properly, after of course
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removing the gpio_card_detect field of the mvsdio_platform_data
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instance for this board.
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Reported-by: Ralph Droms <rdroms at gmail.com>
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Tested-by: Ralph Droms <rdroms at gmail.com>
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Signed-off-by: Thomas Petazzoni <thomas.petazzoni at free-electrons.com>
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---
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This patch should be applied on 3.9-rcX.
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Changes between v2 and v3:
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* Add a reference to the commit introducing the regression. Suggested
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by Russell King.
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* Fix the e-mail address from Ralph Droms, and add his Tested-by.
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* No code change.
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Changes between v1 and v2:
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* Send the patch to the MMC maintainer instead of the Marvell
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maintainers.
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---
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drivers/mmc/host/mvsdio.c | 4 ++--
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1 file changed, 2 insertions(+), 2 deletions(-)
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diff --git a/drivers/mmc/host/mvsdio.c b/drivers/mmc/host/mvsdio.c
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index 145cdaf..1e4d567 100644
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--- a/drivers/mmc/host/mvsdio.c
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+++ b/drivers/mmc/host/mvsdio.c
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@@ -741,8 +741,8 @@ static int __init mvsd_probe(struct platform_device *pdev)
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goto out;
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}
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host->base_clock = mvsd_data->clock / 2;
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- gpio_card_detect = mvsd_data->gpio_card_detect;
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- gpio_write_protect = mvsd_data->gpio_write_protect;
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+ gpio_card_detect = mvsd_data->gpio_card_detect ? : -EINVAL;
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+ gpio_write_protect = mvsd_data->gpio_write_protect ? : -EINVAL;
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}
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mmc->ops = &mvsd_ops;
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--
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1.7.9.5
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