Alexander Sabourenkov wrote:
Hello.

So, my bet for your second report is your hardware went through
something similar as above.


Thanks for the insight. Let's dismiss it then.

Back to the TX4, I tried libata-dev.git cloned at about 20:00 UTC 19.10,
  no perceived difference - parallel read from two drives causes a lot
of  errors.

dmesgs  with boot and errors are at http://lxnt.info/linux/libata-dev/

I don't know what to try next. Any ideas?


Does the attached patch help?

--
tejun
diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c
index 68699b3..4c93fee 100644
--- a/drivers/ata/libata-core.c
+++ b/drivers/ata/libata-core.c
@@ -6435,6 +6435,7 @@ int sata_link_init_spd(struct ata_link *link)
        spd = (scontrol >> 4) & 0xf;
        if (spd)
                link->hw_sata_spd_limit &= (1 << spd) - 1;
+       link->hw_sata_spd_limit = 1;
 
        link->sata_spd_limit = link->hw_sata_spd_limit;
 

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