[Linux][i.mx6] When I boot form emmc, sometime failed to mount sata in kernel.

[charleshuang]

Hi Freescale

When I boot form emmc, sometime failed to mount sata disk in kernel.

That's failed to mount sata debug message from kernel.

##########################################################################

ata1: SATA link down (SStatus 1 SControl 300)

ata1: exception Emask 0x10 SAct 0x0 SErr 0x4040000 action 0xe frozen t4

ata1: irq_stat 0x00000040, connection status changed

ata1: SError: { CommWake DevExch }

ata1: hard resetting link

ata1: SATA link down (SStatus 1 SControl 300)

ata1: EH complete

EXT3-fs: barriers not enabled

kjournald starting.  Commit interval 5 seconds

EXT3-fs (mmcblk0p1): warning: maximal mount count reached, running e2fsck is recommended

EXT3-fs (mmcblk0p1): using internal journal

EXT3-fs (mmcblk0p1): recovery complete

EXT3-fs (mmcblk0p1): mounted filesystem with writeback data mode

VFS: Mounted root (ext3 filesystem) on device 179:1.

Freeing init memory: 192K

##########################################################################

Sometime will be success to mount sata disk.

That's success to mount sata disk message.

##########################################################################

ata1: SATA link up 3.0 Gbps (SStatus 123 SControl 300)

mmcblk0: p1

mmcblk0boot1: unknown partition table

sgtl5000 4-000a: sgtl5000 revision 17

mmcblk0boot0: unknown partition table

ata1.00: ATA-8: Hitachi HTS545016B9A300, PBBOC60F, max UDMA/133

ata1.00: 312581808 sectors, multi 0: LBA48 NCQ (depth 31/32)

ata1.00: configured for UDMA/133

scsi 0:0:0:0: Direct-Access     ATA      Hitachi HTS54501 PBBO PQ: 0 ANSI: 5

sd 0:0:0:0: [sda] 312581808 512-byte logical blocks: (160 GB/149 GiB)

sd 0:0:0:0: [sda] Write Protect is off

sd 0:0:0:0: [sda] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA

asoc: sgtl5000 <-> imx-ssi.1 mapping ok

sda: sda1

sd 0:0:0:0: [sda] Attached SCSI disk

##########################################################################

Thanks

Clayder

[tonyzheng]

Hi, Charles

Can you provide some information about your OS? Linux 3.0.35 or 3.10.17?

[clayderhuang]

Hi Jimse

My OS is Linux 3.0.35  4.0.0.

It seems that your SATA device presence is detected but PHY communication is not established!

But my platform device sometime can mount  SATA disk,sometime can not mount.

[tonyzheng]

Hi,

There is a workaround about sata phy link problems. you can try it!

[clayderhuang]

Hi Jimse

The patch I already try this. The result is the same (sometime to mount SATA failed).

I already modify about sata phy parameters (IOMUXC_GPR13) with hardware engineer.

Sata eye diagram test is pass.

This is my setting parameter.

############################################################################

tmpdata = readl(IOMUXC_GPR13);

#if defined(CONFIG_MACH_MX6Q_ROM_5420)

        writel(((tmpdata & ~0x07FFFFFF) | 0x059180E6), IOMUXC_GPR13);

############################################################################

If sata phy link issue, How should I do?

Thanks

Clayder

[tonyzheng]

hi,

It seems that the COMINIT is detceted and PHY Ready is not detected. I think there are something wrong with your PHY layer. As an advice, you can try to read Port0 Serial ATA Status Register (SATA_P0SSTS) and open the debug mode to output more log information and then find what errors it occurs.

[clayderhuang]

Hi Jimse

I already open the debug message.

//-------------------------------------------------------------------//

ata1: SATA link down (SStatus 1 SControl 300)

//-------------------------------------------------------------------//

Serial ATA status register is 0x01, that's right?

Please open attached file. There is message about SATA mount fail.

I test 780 times and just only twice fail about mount SATA disk.

If you need the other debug message, please tell me.

Thanks

[tonyzheng]

It seems that your SATA device presence is detected but PHY communication is not established!