Commit d2f8bfa4 authored Mar 10, 2020 by Ulf Hansson

mmc: sdhci-tegra: Fix busy detection by enabling MMC_CAP_NEED_RSP_BUSY



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@nvidia.com>
Reported-by: Peter Geis <pgwipeout@gmail.com>
Suggested-by: Sowjanya Komatineni <skomatineni@nvidia.com>
Cc: <stable@vger.kernel.org>
Tested-by: Sowjanya Komatineni <skomatineni@nvidia.com>
Tested-By: Peter Geis <pgwipeout@gmail.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

parent 055e0483

drivers/mmc/host/sdhci-tegra.c

+3 −0

Original line number	Diff line number	Diff line
		@@ -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",

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