tree 9b8a3801e8c01a369ea4d81e1486cf7ce7b3b40d
parent 0bed13bebd6c99d097796d2ca6c4f10fb5b2eabc
author Suman Tripathi <stripathi@apm.com> 1409217682 +0530
committer Tejun Heo <tj@kernel.org> 1409970435 +0900

ahci_xgene: Fix the link down in first attempt for the APM X-Gene SoC AHCI SATA host controller driver.

Due to HW errata the APM X-Gene AHCI SATA host controller reports link
down even if the device presence is detected. This issue is due to speed
negotiation failure. This patch implements the algorithm to retry the
COMRESET if PxSTAT register reports device presence detected but
PHY communication not established. The maximum retry attempts are 3.

This patch also fixes the code to match the algorithm for the printing
a warning message if the disparity error still exists after link up.

Signed-off-by: Loc Ho <lho@apm.com>
Signed-off-by: Suman Tripathi <stripathi@apm.com>
Signed-off-by: Tejun Heo <tj@kernel.org>