@@ -196,10 +196,26 @@ static int highbank_initialize_phys(struct device *dev, void __iomem *addr)
return 0;
}
+/*
+ * The Calxeda SATA phy intermittently fails to bring up a link with Gen3
+ * Retrying the phy hard reset can work around the issue, but the drive
+ * may fail again. In less than 150 out of 15000 test runs, it took more
+ * than 10 tries for the link to be established (but never more than 35).
+ * Triple the maximum observed retry count to provide plenty of margin for
+ * rare events and to guarantee that the link is established.
+ *
+ * Also, the default 2 second time-out on a failed drive is too long in
+ * this situation. The uboot implementation of the same driver function
+ * uses a much shorter time-out period and never experiences a time out
+ * issue. Reducing the time-out to 500ms improves the responsiveness.
+ * The other timing constants were kept the same as the stock AHCI driver.
+ * This change was also tested 15000 times on 24 drives and none of them
+ * experienced a time out.
+ */
static int ahci_highbank_hardreset(struct ata_link *link, unsigned int *class,
unsigned long deadline)
{
- const unsigned long *timing = sata_ehc_deb_timing(&link->eh_context);
+ static const unsigned long timing[] = { 5, 100, 500};
struct ata_port *ap = link->ap;
struct ahci_port_priv *pp = ap->private_data;
u8 *d2h_fis = pp->rx_fis + RX_FIS_D2H_REG;
@@ -207,7 +223,7 @@ static int ahci_highbank_hardreset(struct ata_link *link, unsigned int *class,
bool online;
u32 sstatus;
int rc;
- int retry = 10;
+ int retry = 100;
ahci_stop_engine(ap);
This is a note to let you know that I have just added a patch titled sata_highbank: increase retry count but shorten duration for to the linux-3.8.y-queue branch of the 3.8.y.z extended stable tree which can be found at: http://kernel.ubuntu.com/git?p=ubuntu/linux.git;a=shortlog;h=refs/heads/linux-3.8.y-queue If you, or anyone else, feels it should not be added to this tree, please reply to this email. For more information about the 3.8.y.z tree, see https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable Thanks. -Luis ------ From cc49a0c9ccff9de92b75656b2c291204dfefe85c Mon Sep 17 00:00:00 2001 From: Mark Langsdorf <mark.langsdorf@calxeda.com> Date: Mon, 3 Jun 2013 08:22:54 -0500 Subject: [PATCH] sata_highbank: increase retry count but shorten duration for Calxeda controller commit ddfef5de3d716f77bad32dbbba6b280158dfd721 upstream. Increase the retry count for the hard reset function to 100 but shorten the time out period to 500 ms. See the comment for ahci_highbank_hardreset for the reasons why those vaulues were chosen. Signed-off-by: Mark Langsdorf <mark.langsdorf@calxeda.com> Signed-off-by: Tejun Heo <tj@kernel.org> Signed-off-by: Luis Henriques <luis.henriques@canonical.com> --- drivers/ata/sata_highbank.c | 20 ++++++++++++++++++-- 1 file changed, 18 insertions(+), 2 deletions(-) -- 1.8.1.2