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

From: Greg Kroah-Hartman
Date: Tue Mar 31 2020 - 05:02:45 EST


From: Ulf Hansson <ulf.hansson@xxxxxxxxxx>

[ 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@xxxxxxxxxx>
Reported-by: Peter Geis <pgwipeout@xxxxxxxxx>
Suggested-by: Sowjanya Komatineni <skomatineni@xxxxxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx>
Tested-by: Sowjanya Komatineni <skomatineni@xxxxxxxxxx>
Tested-By: Peter Geis <pgwipeout@xxxxxxxxx>
Signed-off-by: Ulf Hansson <ulf.hansson@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
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