Upstream fix for WP detection on SD card
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Peter Robinson
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Thu, 08 Aug 2019 15:25:43 -0700 (PDT)
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From: Dmitry Osipenko <digetx@gmail.com>
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To: Thierry Reding <thierry.reding@gmail.com>,
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Jonathan Hunter <jonathanh@nvidia.com>,
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Adrian Hunter <adrian.hunter@intel.com>,
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Ulf Hansson <ulf.hansson@linaro.org>
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Cc: linux-mmc@vger.kernel.org, linux-tegra@vger.kernel.org,
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linux-kernel@vger.kernel.org
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Subject: [PATCH v1] Revert "mmc: sdhci-tegra: drop ->get_ro() implementation"
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Date: Fri, 9 Aug 2019 01:24:30 +0300
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Message-Id: <20190808222430.28477-1-digetx@gmail.com>
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The WRITE_PROTECT bit is always in a "protected mode" on Tegra and
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WP-GPIO state need to be used instead. In a case of the GPIO absence,
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write-enable should be assumed. External SD is writable once again as
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a result of this patch because the offending commit changed behaviour for
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the case of a missing WP-GPIO to fall back to WRITE_PROTECT bit-checking,
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which is incorrect for Tegra.
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Cc: stable@vger.kernel.org # v5.1+
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Fixes: e8391453e27f ("mmc: sdhci-tegra: drop ->get_ro() implementation")
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Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
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Acked-by: Thierry Reding <treding@nvidia.com>
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Acked-by: Adrian Hunter <adrian.hunter@intel.com>
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---
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drivers/mmc/host/sdhci-tegra.c | 14 ++++++++++++++
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1 file changed, 14 insertions(+)
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diff --git a/drivers/mmc/host/sdhci-tegra.c b/drivers/mmc/host/sdhci-tegra.c
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index f4d4761cf20a..02d8f524bb9e 100644
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--- a/drivers/mmc/host/sdhci-tegra.c
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+++ b/drivers/mmc/host/sdhci-tegra.c
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@@ -258,6 +258,16 @@ static void tegra210_sdhci_writew(struct sdhci_host *host, u16 val, int reg)
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}
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}
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+static unsigned int tegra_sdhci_get_ro(struct sdhci_host *host)
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+{
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+ /*
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+ * Write-enable shall be assumed if GPIO is missing in a board's
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+ * device-tree because SDHCI's WRITE_PROTECT bit doesn't work on
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+ * Tegra.
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+ */
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+ return mmc_gpio_get_ro(host->mmc);
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+}
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+
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static bool tegra_sdhci_is_pad_and_regulator_valid(struct sdhci_host *host)
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{
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struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
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@@ -1224,6 +1234,7 @@ static const struct cqhci_host_ops sdhci_tegra_cqhci_ops = {
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};
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static const struct sdhci_ops tegra_sdhci_ops = {
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+ .get_ro = tegra_sdhci_get_ro,
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.read_w = tegra_sdhci_readw,
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.write_l = tegra_sdhci_writel,
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.set_clock = tegra_sdhci_set_clock,
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@@ -1279,6 +1290,7 @@ static const struct sdhci_tegra_soc_data soc_data_tegra30 = {
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};
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static const struct sdhci_ops tegra114_sdhci_ops = {
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+ .get_ro = tegra_sdhci_get_ro,
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.read_w = tegra_sdhci_readw,
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.write_w = tegra_sdhci_writew,
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.write_l = tegra_sdhci_writel,
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@@ -1332,6 +1344,7 @@ static const struct sdhci_tegra_soc_data soc_data_tegra124 = {
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};
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static const struct sdhci_ops tegra210_sdhci_ops = {
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+ .get_ro = tegra_sdhci_get_ro,
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.read_w = tegra_sdhci_readw,
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.write_w = tegra210_sdhci_writew,
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.write_l = tegra_sdhci_writel,
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@@ -1366,6 +1379,7 @@ static const struct sdhci_tegra_soc_data soc_data_tegra210 = {
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};
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static const struct sdhci_ops tegra186_sdhci_ops = {
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+ .get_ro = tegra_sdhci_get_ro,
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.read_w = tegra_sdhci_readw,
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.write_l = tegra_sdhci_writel,
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.set_clock = tegra_sdhci_set_clock,
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@ -1,32 +1,3 @@
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From 005e0b987019fff6013dff99f44d9f6ce68f08ad Mon Sep 17 00:00:00 2001
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From: Peter Robinson <pbrobinson@gmail.com>
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Date: Sat, 23 Mar 2019 17:42:18 +0000
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Subject: [PATCH 1/3] arm64: tegra210: Jetson TX1: disable WP to make SD card
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work
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There's some issue with Write Protect detection on the Jetson TX1
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so just apply a quirk to disable the check for the time being.
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Signed-off-by: Peter Robinson <pbrobinson@gmail.com>
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---
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arch/arm64/boot/dts/nvidia/tegra210-p2597.dtsi | 1 +
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1 file changed, 1 insertion(+)
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diff --git a/arch/arm64/boot/dts/nvidia/tegra210-p2597.dtsi b/arch/arm64/boot/dts/nvidia/tegra210-p2597.dtsi
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index a96e6ee70c21..072788646cbf 100644
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--- a/arch/arm64/boot/dts/nvidia/tegra210-p2597.dtsi
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+++ b/arch/arm64/boot/dts/nvidia/tegra210-p2597.dtsi
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@@ -1456,6 +1456,7 @@
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sdhci@700b0000 {
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status = "okay";
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bus-width = <4>;
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+ disable-wp;
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cd-gpios = <&gpio TEGRA_GPIO(Z, 1) GPIO_ACTIVE_LOW>;
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--
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2.20.1
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From aea4a7a551fd7342299d34f04a8b75f58644ac07 Mon Sep 17 00:00:00 2001
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From: Peter Robinson <pbrobinson@gmail.com>
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Date: Sat, 23 Mar 2019 17:45:10 +0000
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@ -558,6 +558,8 @@ Patch306: arm-sdhci-esdhc-imx-fixes.patch
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Patch320: arm64-tegra-jetson-tx1-fixes.patch
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# https://www.spinics.net/lists/linux-tegra/msg43110.html
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Patch321: arm64-tegra-Jetson-TX2-Allow-bootloader-to-configure.patch
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# https://patchwork.kernel.org/patch/11084925/
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Patch322: arm64-Revert-mmc-sdhci-tegra-drop---get_ro-implementation.patch
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# 400 - IBM (ppc/s390x) patches
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