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From:   =?UTF-8?q?Jonathan=20Neusch=C3=A4fer?= <j.neuschaefer@gmx.net>
To:     linux-mmc@vger.kernel.org
Cc:     =?UTF-8?q?Jonathan=20Neusch=C3=A4fer?= <j.neuschaefer@gmx.net>,
        Ulf Hansson <ulf.hansson@linaro.org>,
        Linus Walleij <linus.walleij@linaro.org>,
        Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>,
        linux-kernel@vger.kernel.org
Subject: [PATCH] mmc: spi: Fix card detection during probe
Date:   Sun, 10 Feb 2019 18:31:07 +0100
Message-Id: <20190210173109.12602-1-j.neuschaefer@gmx.net>
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Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

When using the mmc_spi driver with a card-detect pin, I noticed that the
card was not detected immediately after probe, but only after it was
unplugged and plugged back in (and the CD IRQ fired).

The call tree looks something like this:

mmc_spi_probe
  mmc_add_host
    mmc_start_host
      _mmc_detect_change
        mmc_schedule_delayed_work(&host->detect, 0)
          mmc_rescan
            host->bus_ops->detect(host)
              mmc_detect
                _mmc_detect_card_removed
                  host->ops->get_cd(host)
                    mmc_gpio_get_cd -> -ENOSYS (ctx->cd_gpio not set)
  mmc_gpiod_request_cd
    ctx->cd_gpio = desc

To fix this issue, call mmc_detect_change after the card-detect GPIO/IRQ
is registered.

Signed-off-by: Jonathan Neuschäfer <j.neuschaefer@gmx.net>
---
 drivers/mmc/host/mmc_spi.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/mmc/host/mmc_spi.c b/drivers/mmc/host/mmc_spi.c
index 10ba46b728e8..8ade14fb2148 100644
--- a/drivers/mmc/host/mmc_spi.c
+++ b/drivers/mmc/host/mmc_spi.c
@@ -1450,6 +1450,7 @@ static int mmc_spi_probe(struct spi_device *spi)
 		mmc->caps &= ~MMC_CAP_NEEDS_POLL;
 		mmc_gpiod_request_cd_irq(mmc);
 	}
+	mmc_detect_change(mmc, 0);
 
 	/* Index 1 is write protect/read only */
 	status = mmc_gpiod_request_ro(mmc, NULL, 1, false, 0, NULL);
-- 
2.20.1