[U-Boot,v3,09/22] ahci: Make sending the SETFEATURES_XFER command optional

Submitted by Simon Glass on Oct. 29, 2012, 3:23 p.m.

Details

Message ID 1351524245-19584-10-git-send-email-sjg@chromium.org
State Accepted, archived
Delegated to: Tom Rini
Headers show

Commit Message

Simon Glass Oct. 29, 2012, 3:23 p.m.
From: Gabe Black <gabeblack@chromium.org>

This command doesn't really do anything when talking to a SATA device, and
sending it confuses some of them. This change makes sending the command
optional, and defaults to not. The situations where it should be sent are not
the common case.

With the standard SSD in the machine, here are some times with the option
turned off:
1. 8277
2. 8273
3. 8050

And turned on:
1. 8303
2. 8155
3. 8276

Sending that command seems to have no meaningful effect on performance.

This fixes problems with an SSD marked Toshiba NV6424, Taiwan 11159AE P
and TC58NVG5D2FTA10.

Signed-off-by: Gabe Black <gabeblack@chromium.org>
Signed-off-by: Taylor Hutt <thutt@chromium.org>
Signed-off-by: Simon Glass <sjg@chromium.org>
---
Changes in v3:
- Move missing #ifdef CONFIG_AHCI_SETFEATURES_XFER from later commit

 drivers/block/ahci.c |    6 ++++++
 1 files changed, 6 insertions(+), 0 deletions(-)

Patch hide | download patch | download mbox

diff --git a/drivers/block/ahci.c b/drivers/block/ahci.c
index 0a7ad81..2236321 100644
--- a/drivers/block/ahci.c
+++ b/drivers/block/ahci.c
@@ -373,6 +373,7 @@  static void ahci_fill_cmd_slot(struct ahci_ioports *pp, u32 opts)
 }
 
 
+#ifdef CONFIG_AHCI_SETFEATURES_XFER
 static void ahci_set_feature(u8 port)
 {
 	struct ahci_ioports *pp = &(probe_ent->port[port]);
@@ -397,6 +398,7 @@  static void ahci_set_feature(u8 port)
 		printf("set feature error on port %d!\n", port);
 	}
 }
+#endif
 
 
 static int ahci_port_start(u8 port)
@@ -743,7 +745,9 @@  void scsi_low_level_init(int busdevfunc)
 				printf("Can not start port %d\n", i);
 				continue;
 			}
+#ifdef CONFIG_AHCI_SETFEATURES_XFER
 			ahci_set_feature((u8) i);
+#endif
 		}
 	}
 }
@@ -784,7 +788,9 @@  int ahci_init(u32 base)
 				printf("Can not start port %d\n", i);
 				continue;
 			}
+#ifdef CONFIG_AHCI_SETFEATURES_XFER
 			ahci_set_feature((u8) i);
+#endif
 		}
 	}
 err_out: