linux-kernel - [PATCH 5.5 004/170] mmc: sdhci-omap: Fix busy detection by enabling MMC_CAP_NEED_RSP

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Message-Id: <20200331085424.558492515@linuxfoundation.org>
Date:   Tue, 31 Mar 2020 10:56:58 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Naresh Kamboju <naresh.kamboju@...aro.org>,
        Anders Roxell <anders.roxell@...aro.org>,
        Faiz Abbas <faiz_abbas@...com>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.5 004/170] mmc: sdhci-omap: Fix busy detection by enabling MMC_CAP_NEED_RSP_BUSY

From: Ulf Hansson <ulf.hansson@...aro.org>

[ Upstream commit 055e04830d4544c57f2a5192a26c9e25915c29c0 ]

It has turned out that the sdhci-omap controller requires the R1B response,
for commands that has this response associated with them. So, converting
from an R1B to an R1 response for a CMD6 for example, leads to problems
with the HW busy detection support.

Fix this by informing the mmc core about the requirement, via setting the
host cap, MMC_CAP_NEED_RSP_BUSY.

Reported-by: Naresh Kamboju <naresh.kamboju@...aro.org>
Reported-by: Anders Roxell <anders.roxell@...aro.org>
Reported-by: Faiz Abbas <faiz_abbas@...com>
Cc: <stable@...r.kernel.org>
Tested-by: Anders Roxell <anders.roxell@...aro.org>
Tested-by: Faiz Abbas <faiz_abbas@...com>
Signed-off-by: Ulf Hansson <ulf.hansson@...aro.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/mmc/host/sdhci-omap.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/mmc/host/sdhci-omap.c b/drivers/mmc/host/sdhci-omap.c
index 083e7e053c954..d3135249b2e40 100644
--- a/drivers/mmc/host/sdhci-omap.c
+++ b/drivers/mmc/host/sdhci-omap.c
@@ -1134,6 +1134,9 @@ static int sdhci_omap_probe(struct platform_device *pdev)
 	host->mmc_host_ops.execute_tuning = sdhci_omap_execute_tuning;
 	host->mmc_host_ops.enable_sdio_irq = sdhci_omap_enable_sdio_irq;
 
+	/* R1B responses is required to properly manage HW busy detection. */
+	mmc->caps |= MMC_CAP_NEED_RSP_BUSY;
+
 	ret = sdhci_setup_host(host);
 	if (ret)
 		goto err_put_sync;
-- 
2.20.1