From 1ec1fd9dde62d87b0ca284d4494f627f73ed154e Mon Sep 17 00:00:00 2001
From: Anurag Kumar Vulisha <anurag.kumar.vulisha@xilinx.com>
Date: Fri, 27 Nov 2015 20:48:24 +0530
Subject: [PATCH 3/3] drivers: ata: Disable Device Sleep capability
Patch-mainline: Not yet, come from xlnx tree, pushing Xilinx
References: fate#320029
Since CEVA controller does not support Device Sleep capability,
we need to clear that feature by clearing the DEVSLP bit in word78
of IDENTIFY DEVICE data. This patch does the same.
Signed-off-by: Anurag Kumar Vulisha <anuragku@xilinx.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
(cherry picked from commit 76b66809e460d3049c0909dca1c95313e9414e0e)
Signed-off-by: Alexander Graf <agraf@suse.de>
---
drivers/ata/ahci_ceva.c | 18 ++++++++++++++++++
1 file changed, 18 insertions(+)
diff --git a/drivers/ata/ahci_ceva.c b/drivers/ata/ahci_ceva.c
index aa32c8a..b63fab2 100644
--- a/drivers/ata/ahci_ceva.c
+++ b/drivers/ata/ahci_ceva.c
@@ -81,8 +81,26 @@ struct ceva_ahci_priv {
int flags;
};
+static unsigned int ceva_ahci_read_id(struct ata_device *dev,
+ struct ata_taskfile *tf, u16 *id)
+{
+ u32 err_mask;
+
+ err_mask = ata_do_dev_read_id(dev, tf, id);
+ if (err_mask)
+ return err_mask;
+ /*
+ * Since CEVA controller does not support device sleep feature, we
+ * need to clear DEVSLP (bit 8) in word78 of the IDENTIFY DEVICE data.
+ */
+ id[ATA_ID_FEATURE_SUPP] &= cpu_to_le16(~(1 << 8));
+
+ return 0;
+}
+
static struct ata_port_operations ahci_ceva_ops = {
.inherits = &ahci_platform_ops,
+ .read_id = ceva_ahci_read_id,
};
static const struct ata_port_info ahci_ceva_port_info = {
--
1.8.5.6