linux-kernel - [PATCH 5.5 005/170] mmc: sdhci-tegra: Fix busy detection by enabling MMC_CAP_NEED_RSP

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Message-Id: <20200331085424.690150019@linuxfoundation.org>
Date:   Tue, 31 Mar 2020 10:56:59 +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, Bitan Biswas <bbiswas@...dia.com>,
        Peter Geis <pgwipeout@...il.com>,
        Sowjanya Komatineni <skomatineni@...dia.com>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.5 005/170] mmc: sdhci-tegra: Fix busy detection by enabling MMC_CAP_NEED_RSP_BUSY

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

[ Upstream commit d2f8bfa4bff5028bc40ed56b4497c32e05b0178f ]

It has turned out that the sdhci-tegra 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: Bitan Biswas <bbiswas@...dia.com>
Reported-by: Peter Geis <pgwipeout@...il.com>
Suggested-by: Sowjanya Komatineni <skomatineni@...dia.com>
Cc: <stable@...r.kernel.org>
Tested-by: Sowjanya Komatineni <skomatineni@...dia.com>
Tested-By: Peter Geis <pgwipeout@...il.com>
Signed-off-by: Ulf Hansson <ulf.hansson@...aro.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/mmc/host/sdhci-tegra.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/mmc/host/sdhci-tegra.c b/drivers/mmc/host/sdhci-tegra.c
index 403ac44a73782..a25c3a4d3f6cb 100644
--- a/drivers/mmc/host/sdhci-tegra.c
+++ b/drivers/mmc/host/sdhci-tegra.c
@@ -1552,6 +1552,9 @@ static int sdhci_tegra_probe(struct platform_device *pdev)
 	if (tegra_host->soc_data->nvquirks & NVQUIRK_ENABLE_DDR50)
 		host->mmc->caps |= MMC_CAP_1_8V_DDR;
 
+	/* R1B responses is required to properly manage HW busy detection. */
+	host->mmc->caps |= MMC_CAP_NEED_RSP_BUSY;
+
 	tegra_sdhci_parse_dt(host);
 
 	tegra_host->power_gpio = devm_gpiod_get_optional(&pdev->dev, "power",
-- 
2.20.1