On 06/20/2014 11:25 AM, Sergei Shtylyov wrote:
On 06/20/2014 12:32 PM, Suman Tripathi wrote:
This patch fixes the link down issue by retry for the APM X-Gene SoC
SATA host controller driver. Due to board design issue and short margin
limitation, it is observed that once out of many thousands power cycle
test, the sata link may not link up.
Signed-off-by: Loc Ho <lho@xxxxxxx>
Signed-off-by: Suman Tripathi <stripathi@xxxxxxx>
---
drivers/ata/ahci_xgene.c | 9 +++++++++
1 file changed, 9 insertions(+)
diff --git a/drivers/ata/ahci_xgene.c b/drivers/ata/ahci_xgene.c
index 5f0f750..d43b6ce 100644
--- a/drivers/ata/ahci_xgene.c
+++ b/drivers/ata/ahci_xgene.c
[...]
@@ -235,15 +238,21 @@ static int xgene_ahci_do_hardreset(struct ata_link *link,
u8 *d2h_fis = pp->rx_fis + RX_FIS_D2H_REG;
void __iomem *port_mmio = ahci_port_base(ap);
struct ata_taskfile tf;
+ int link_down_retry = 0;
int rc;
u32 val;
+hardreset_retry:
/* clear D2H reception area to properly wait for D2H FIS */
ata_tf_init(link->device, &tf);
tf.command = ATA_BUSY;
ata_tf_to_fis(&tf, 0, 0, d2h_fis);
rc = sata_link_hardreset(link, timing, deadline, online,
ahci_check_ready);
+
+ if (!*online)
+ if (link_down_retry++ < MAX_LINK_DOWN_RETRY)
Could be folded into single *if* (and so indentation decreased).
better yet, for readability, a single while() loop
+ goto hardreset_retry;
WBR, Sergei
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