Hi,
On 01/12/2019 04:26 PM, Aaro Koskinen wrote:
> Hi,
>
> On Sun, Jan 06, 2019 at 02:46:07PM +0200, Aaro Koskinen wrote:
>> Commit 7ff7a5b1bfff ("MIPS: lemote2f_defconfig: Convert to use libata
>> PATA drivers") switched from IDE to libata PATA on Loongson 2F, but
>> neither PATA_AMD or PATA_CS5536 work well on this platform compared
>> to the AMD74XX IDE driver.
Sorry about that.
>> During the ATA init/probe there is interrupt storm from irq 14, and
>> majority of system boots end up with "nobody cared... IRQ disabled".
>> So the result is a very slow disk access.
>>
>> It seems that the interrupt gets crazy after the port freeze done early
>> during the init, and for whatever reason it cannot be cleared.
>>
>> With the below workaround I was able to boot the system normally. I
>> guess that rather than going back to old IDE driver, we should just try
>> to make pata_cs5536 work (and forget PATA AMD on this board)...?
>
> Hmm, even with this hack I get ~500 spurious IRQs during the boot.
>
> Also compared to old IDE, there's 33 vs 100 speed difference:
>
> [ 3.324000] ata1: PATA max UDMA/100 cmd 0x1f0 ctl 0x3f6 bmdma 0x4ce0 irq 14
> [ 3.584000] ata1.00: ATA-8: WDC WD1600BEVS-00VAT0, 11.01A11, max UDMA/133
> [ 3.588000] ata1.00: 312581808 sectors, multi 16: LBA48
> [ 3.592000] ata1.00: limited to UDMA/33 due to 40-wire cable
>
> [ 4.540000] Probing IDE interface ide0...
> [ 4.992000] hda: WDC WD1600BEVS-00VAT0, ATA DISK drive
> [ 5.716000] hda: host max PIO5 wanted PIO255(auto-tune) selected PIO4
> [ 5.716000] hda: UDMA/100 mode selected
Can you try booting with "libata.force=1:80c" (and if that doesn't work with
"libata.force=1:short40c") and also provide full dmesg-s for working (ide) and
not working (libata) kernels.
Best regards,
--
Bartlomiej Zolnierkiewicz
Samsung R&D Institute Poland
Samsung Electronics
