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From:   Martin Blumenstingl <martin.blumenstingl@googlemail.com>
To:     ulf.hansson@linaro.org, linux-mmc@vger.kernel.org,
        linux-amlogic@lists.infradead.org
Cc:     linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org,
        Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Subject: [PATCH 1/1] mmc: meson-mx-sdio: Set MMC_CAP_WAIT_WHILE_BUSY
Date:   Fri, 10 Apr 2020 23:30:43 +0200
Message-Id: <20200410213043.1091851-1-martin.blumenstingl@googlemail.com>
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The Meson SDIO controller uses the DAT0 lane for hardware busy
detection. Set MMC_CAP_WAIT_WHILE_BUSY accordingly. This fixes
the following error observed with Linux 5.7 (pre-rc-1):
  mmc1: Card stuck being busy! __mmc_poll_for_busy
  blk_update_request: I/O error, dev mmcblk1, sector 17111080 op
   0x3:(DISCARD) flags 0x0 phys_seg 1 prio class 0

Signed-off-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
---
I'm sending this as RFC because I'm not sure if this is a proper fix.
It "fixes" the issue for me but I want the MMC maintainers to double-
check this.


 drivers/mmc/host/meson-mx-sdio.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/mmc/host/meson-mx-sdio.c b/drivers/mmc/host/meson-mx-sdio.c
index 8b038e7b2cd3..fe02130237a8 100644
--- a/drivers/mmc/host/meson-mx-sdio.c
+++ b/drivers/mmc/host/meson-mx-sdio.c
@@ -570,7 +570,7 @@ static int meson_mx_mmc_add_host(struct meson_mx_mmc_host *host)
 	mmc->f_max = clk_round_rate(host->cfg_div_clk,
 				    clk_get_rate(host->parent_clk));
 
-	mmc->caps |= MMC_CAP_ERASE | MMC_CAP_CMD23;
+	mmc->caps |= MMC_CAP_ERASE | MMC_CAP_CMD23 | MMC_CAP_WAIT_WHILE_BUSY;
 	mmc->ops = &meson_mx_mmc_ops;
 
 	ret = mmc_of_parse(mmc);
-- 
2.26.0