Messages in this thread | | | Date | Tue, 23 Jan 2007 17:51:03 +0300 | From | Sergei Shtylyov <> | Subject | Re: [PATCH 13/15] ide: fix UDMA/MWDMA/SWDMA masks |
| |
Hello.
Alan wrote: >>>> Ugh, I'm not seeing any *actual* support for MW/SW DMA in this driver...
>>>Thats long been broken. Should be correct in the libata driver
>> Here's a surprise for you. pata_cmd64x copied the SW/MW DMA setup code >>from the IDE driver. No way it could be working. You may check against the >>PC64x datasheets (if you have them -- if you don't I think I may share) and >>see for yourself -- it's abolutely idiotic.
I.e. MWDMA2 should be working due to the way the driver is written (it sets up PIO4 timings when auto-tuning DMA) but not the other modes since speedproc() method is brain-damaged in this part.
> Not a suprise to be honest. I fixed some of the ALi stuff when I did it > and I think that was pushed back into drivers/ide. The CMD64x hasn't had > much love really.
Another buglet found by random glancing at this driver:
/** * cmd648_dma_stop - DMA stop callback * @qc: Command in progress * * DMA has completed. */
static void cmd648_bmdma_stop(struct ata_queued_cmd *qc) { struct ata_port *ap = qc->ap; struct pci_dev *pdev = to_pci_dev(ap->host->dev); u8 dma_intr; int dma_reg = ap->port_no ? ARTTIM23_INTR_CH1 : CFR_INTR_CH0; int dma_mask = ap->port_no ? ARTTIM2 : CFR;
ata_bmdma_stop(qc);
pci_read_config_byte(pdev, dma_reg, &dma_intr); pci_write_config_byte(pdev, dma_reg, dma_intr | dma_mask); }
dma_reg and dma_mask initializers must have been swapped since ARTTIM2 and CFR are regster names. So, the code reads/writes semi-random regs...
> Wouldn't mind the older 64x (not 640) data sheets if they are sharable.
Sent what I had on this machine. Will looks for newer revision of PCJ0646U2 spec elsewhere...
MBR, Sergei - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
| |