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The sata core driver already retries to resume the link because some controllers ignore writes to the SControl register, but just retrying the resume operation doesn't work - we need to issue he phy/wake reset again to make it work. Reimplement ahci_hardreset() in the driver and poke the controller a couple times before really giving up. Signed-off-by: Bartosz Golaszewski --- drivers/ata/ahci_da850.c | 28 +++++++++++++++++++++++++++- 1 file changed, 27 insertions(+), 1 deletion(-) -- 2.9.3 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel diff --git a/drivers/ata/ahci_da850.c b/drivers/ata/ahci_da850.c index 11dd87e..0b2b1a4 100644 --- a/drivers/ata/ahci_da850.c +++ b/drivers/ata/ahci_da850.c @@ -16,7 +16,8 @@ #include #include "ahci.h" -#define DRV_NAME "ahci_da850" +#define DRV_NAME "ahci_da850" +#define HARDRESET_RETRIES 5 /* SATA PHY Control Register offset from AHCI base */ #define SATA_P0PHYCR_REG 0x178 @@ -76,6 +77,29 @@ static int ahci_da850_softreset(struct ata_link *link, return ret; } +static int ahci_da850_hardreset(struct ata_link *link, + unsigned int *class, unsigned long deadline) +{ + int ret, retry = HARDRESET_RETRIES; + bool online; + + /* + * In order to correctly service the LCD controller of the da850 SoC, + * we increased the PLL0 frequency to 456MHz from the default 300MHz. + * + * This made the SATA controller unstable and the hardreset operation + * does not always succeed the first time. Before really giving up to + * bring up the link, retry the reset a couple times. + */ + do { + ret = ahci_do_hardreset(link, class, deadline, &online); + if (online) + return ret; + } while (retry--); + + return ret; +} + static struct ata_port_operations ahci_da850_port_ops = { .inherits = &ahci_platform_ops, .softreset = ahci_da850_softreset, @@ -83,6 +107,8 @@ static struct ata_port_operations ahci_da850_port_ops = { * No need to override .pmp_softreset - it's only used for actual * PMP-enabled ports. */ + .hardreset = ahci_da850_hardreset, + .pmp_hardreset = ahci_da850_hardreset, }; static const struct ata_port_info ahci_da850_port_info = {