66 lines
2.2 KiB
Diff
66 lines
2.2 KiB
Diff
From 91769986a724f63db52f3c78c79ac84a5b7045bf Mon Sep 17 00:00:00 2001
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From: Daniel Willmann <daniel@totalueberwachung.de>
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Date: Sat, 19 Apr 2014 23:59:18 +0200
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Subject: [PATCH] mmc: mxs: fix card detection function for broken card detect
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Return -ENOSYS in get_cd if broken-cd is specified in the device tree.
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Commit a91fe279ae75 (mmc: mxs: use standard flag for broken card
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detection) sets MMC_CAP_NEEDS_POLL when broken-cd is specified. This
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driver sets this flag unconditionally as it does not support a card
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detect interrupt. Instead, broken-cd means that there is no card detect
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signal connected.
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The mmc core checks the get_cd function return value to determine if a
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card is present. Only for a non-zero return value it will attempt to
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initialize the card. So retuning -ENOSYS will allow the card to be
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initialized.
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For comparison, mmc_gpio_get_cd in slot-gpio.c also returns -ENOSYS if
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the card detect GPIO is not valid.
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Signed-off-by: Daniel Willmann <daniel@totalueberwachung.de>
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Acked-by: Sascha Hauer <s.hauer@pengutronix.de>
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Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
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Signed-off-by: Chris Ball <chris@printf.net>
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---
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drivers/mmc/host/mxs-mmc.c | 7 +++++++
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1 file changed, 7 insertions(+)
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--- a/drivers/mmc/host/mxs-mmc.c
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+++ b/drivers/mmc/host/mxs-mmc.c
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@@ -70,6 +70,7 @@ struct mxs_mmc_host {
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unsigned char bus_width;
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spinlock_t lock;
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int sdio_irq_en;
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+ bool broken_cd;
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};
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static int mxs_mmc_get_cd(struct mmc_host *mmc)
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@@ -78,6 +79,9 @@ static int mxs_mmc_get_cd(struct mmc_hos
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struct mxs_ssp *ssp = &host->ssp;
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int present, ret;
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+ if (host->broken_cd)
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+ return -ENOSYS;
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+
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ret = mmc_gpio_get_cd(mmc);
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if (ret >= 0)
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return ret;
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@@ -568,6 +572,7 @@ static int mxs_mmc_probe(struct platform
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{
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const struct of_device_id *of_id =
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of_match_device(mxs_mmc_dt_ids, &pdev->dev);
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+ struct device_node *np = pdev->dev.of_node;
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struct mxs_mmc_host *host;
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struct mmc_host *mmc;
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struct resource *iores;
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@@ -634,6 +639,8 @@ static int mxs_mmc_probe(struct platform
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mmc->caps = MMC_CAP_SD_HIGHSPEED | MMC_CAP_MMC_HIGHSPEED |
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MMC_CAP_SDIO_IRQ | MMC_CAP_NEEDS_POLL;
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+ host->broken_cd = of_property_read_bool(np, "broken-cd");
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+
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mmc->f_min = 400000;
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mmc->f_max = 288000000;
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