[PATCH] mci: core: add write_reliable device parameter

[Michael Grzeschik <m.grzeschik@pengutronix.de>]

Add mmcX.write_reliable parameter so it can be queried by
scripts and board code.

Signed-off-by: Michael Grzeschik <m.grzeschik@pengutronix.de>
---
 drivers/mci/mci-core.c | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)

diff --git a/drivers/mci/mci-core.c b/drivers/mci/mci-core.c
index 48a3df9ec9..1b7526abfa 100644
--- a/drivers/mci/mci-core.c
+++ b/drivers/mci/mci-core.c
@@ -2680,6 +2680,22 @@ static int mci_get_partition_setting_completed(struct mci *mci)
 	return ret;
 }
 
+static int mci_get_write_reliable(struct mci *mci)
+{
+	u8 *ext_csd;
+	int ret;
+
+	ext_csd = mci_get_ext_csd(mci);
+	if (IS_ERR(ext_csd))
+		return PTR_ERR(ext_csd);
+
+	ret = ext_csd[EXT_CSD_WR_REL_SET] & 0x1f;
+
+	dma_free(ext_csd);
+
+	return ret;
+}
+
 /**
  * Probe an MCI card at the given host interface
  * @param mci MCI device instance
@@ -2796,6 +2812,13 @@ static int mci_card_probe(struct mci *mci)
 				"Failed to determine EXT_CSD_PARTITION_SETTING_COMPLETED\n");
 		else
 			dev_add_param_bool_fixed(&mci->dev, "partitioning_completed", ret);
+
+		ret = mci_get_write_reliable(mci);
+		if (ret < 0)
+			dev_dbg(&mci->dev,
+				"Failed to determine EXT_CSD_WR_REL_SET\n");
+		else
+			dev_add_param_bool_fixed(&mci->dev, "write_reliable", ret);
 	}
 
 	mci_parse_cid(mci);
-- 
2.39.5