On 02/02/2015 10:37 PM, Suman Tripathi wrote:
Ugh, please avoid using HTML when posting to the lists hosted on
vger.kernel.org -- it's configured to ignore such mails AFAIK.
This patch addresses the issue with ATA_CMD_SMART pio mode
command for enumeration and device detection with ATA devices.
The X-Gene AHCI controller has an errata in which it cannot clear
the BSY bit after the PIO setup FIS. The dma state machine enters
Hum, if this happens after every PIO command (PIO setup FISes are not
specific to the command, right?), perhaps it would make more sense to record
the *protocol* used by the last command?
No it happens for IDENTIFY DEVICE, ATA_CMD_PACKET and ATA_CMD_SMART commands .
It is actually the commands associated with a BSY bit clearing.
I don't understand that -- BSY bit is cleared for *every* command, either
at the end of it, or along with setting the DRQ bit for PIO data transfer.
CMFatalErrorUpdate state and locks up. It is the same issue as
in the commit 2a0bdff6b958d1b2523d2754b6cd5e__0ea4053016 (ahci-xgene:
fix the dma state machine lockup for the IDENTIFY DEVICE PIO mode
command).
[...]
Signed-off-by: Suman Tripathi <stripathi@xxxxxxx <mailto:stripathi@xxxxxxx>>
Reported-by: Mark Langsdorf <mlangsdo@xxxxxxxxxx
<mailto:mlangsdo@xxxxxxxxxx>>
MBR, Sergei
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