linux-kernel - Re: [PATCH 1/3] ata: sata_dwc_460ex: use "dmas" DT property to find dma channel

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Message-ID: <5676E906.1060603@candw.ms>
Date:	Sun, 20 Dec 2015 13:44:38 -0400
From:	Julian Margetson <runaway@...dw.ms>
To:	Måns Rullgård <mans@...sr.com>
Cc:	Andy Shevchenko <andy.shevchenko@...il.com>,
	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
	Tejun Heo <tj@...nel.org>, linux-ide@...r.kernel.org,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/3] ata: sata_dwc_460ex: use "dmas" DT property to find
 dma channel

On 12/20/2015 1:11 PM, Måns Rullgård wrote:
> Julian Margetson <runaway@...dw.ms> writes:
>
>> On 12/19/2015 4:41 PM, Måns Rullgård wrote:
>>> Andy Shevchenko <andy.shevchenko@...il.com> writes:
>>>
>>>> On Sat, Dec 19, 2015 at 10:16 PM, Julian Margetson <runaway@...dw.ms> wrote:
>>>>> On 12/19/2015 3:07 PM, Måns Rullgård wrote:
>>>>>> Julian Margetson <runaway@...dw.ms> writes:
>>>>>>> Total pages: 522752
>>>>>>> [    0.000000] Kernel command line: root=/dev/sda8 console=ttyS0,115200
>>>>>>> console=tty1 dw_dmac_core.dyndbg dw_dmac.dyndbg
>>>>>> Please add ignore_log_level.
>>>>>>
>>>>> Had to truncate the kernel command line to add it.
>>>> I guess Måns meant 'ignore_loglevel'
>>> Obviously.  I can never remember where the underscores go.
>> [   18.362244] sd 3:0:0:0: [sdc] 976773168 512-byte logical blocks: (500 GB/465 GiB)
>> [   18.372454] sd 3:0:0:0: Attached scsi generic sg3 type 0
>> [   18.405433] sd 3:0:0:0: [sdc] Write Protect is off
>> [   18.420654] sd 3:0:0:0: [sdc] Mode Sense: 00 3a 00 00
>> [   18.461731] sd 3:0:0:0: [sdc] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
>> [   18.502918] sata-dwc 4bffd1000.sata: sata_dwc_qc_prep_by_tag: port=0 dma dir=from device n_elem=1
>> [   18.511807] dma dma0chan0: dwc_prep_slave_sg
>> [   18.516083] dma dma0chan0: scanned 1 descriptors on freelist
>> [   18.521753] sata-dwc 4bffd1000.sata: dma_dwc_xfer_setup sg: 0xedeaa800, count: 1 addr: 0xfffffffff6a14400
>> [   18.531327] sata-dwc 4bffd1000.sata: sata_dwc_qc_issue: tag=0 ap->link.sactive = 0x00000001 sactive=0x00000001
>> [   18.541359] sata-dwc 4bffd1000.sata: sata_dwc_exec_command_by_tag cmd(0x60): READ FPDMA QUEUED tag=0
>> [   18.553703] sata-dwc 4bffd1000.sata: sata_dwc_isr intpr=0x00000082 active_tag=-84148995
>> [   18.561717] sata-dwc 4bffd1000.sata: sata_dwc_isr: NEWFP tag=0
>> [   18.567561] sata-dwc 4bffd1000.sata: sata_dwc_bmdma_start_by_tag qc=ed2340b8 tag: 0 cmd: 0x60 dma_dir: from device start_dma? 1
>> [   18.579043] sata-dwc 4bffd1000.sata: taskfile cmd: 0x60 protocol: ATA NCQ flags: 0x17 device: 40
>> [   18.587836] sata-dwc 4bffd1000.sata: feature: 0x08 nsect: 0x0 lbal: 0x0 lbam: 0x0 lbah: 0x0
>> [   18.596196] sata-dwc 4bffd1000.sata: hob_feature: 0x00 hob_nsect: 0x0 hob_lbal: 0x0 hob_lbam: 0x0 hob_lbah: 0x0
>> [   18.606292] dma dma0chan0: dwc_tx_submit: queued 2
>> [   18.611091] dma dma0chan0: dwc_dostart_first_queued: started 2
>> [   48.748614] ata3: lost interrupt (Status 0x40)
> Now we're getting somewhere.  The dma transfer is set up and initiated,
> but then nothing happens.  Comparing the old sata_dwc driver, from
> before the switch to dmaengine, with the dw_dma driver, I noticed an
> obvious problem: the descriptors are filled in using the wrong byte
> order.  This patch might fix that.
>


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