Hi Joe,
The original intent of the patch was not forcing a 6Gbs drive down to
1.5Gbs after hotplug.
Noting,
SSTATUS = 275 = 0x113 = 0001 0001 0011
That corresponds to ACTIVE PM STATE | GEN1 SPEED | DEVICE DETECTED
spd = 1 (corresponds to 1.5Gbps)
One question, the print for mask came after these 2 lines of code,
right?
/* unconditionally mask off the highest bit */
bit = fls(mask) - 1;
mask &= ~(1 << bit);
In your debug kernel, would please remove the following 2 lines of code
(so the code falls thru)
if (spd > 1)
mask &= (1 << (spd - 1)) - 1;
else <=====
return -EINVAL; <===== Remove these 2 lines of
code.
And finally, at the end __sata_set_spd_needed(), would you please print
out these values?
spd
target
*scontrol
The original patch didn't force changing mask, but, it does "return -EINVAL", I
think it
may fix the problem just letting it fall thru to the end of
sata_down_spd_limit(), but it would
still help to see the original debug values and these new ones with possible
fix. Thank you.
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https://bugs.launchpad.net/bugs/1783906
Title:
Linux 4.15 and onwards fails to initialize some hard drives
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