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Message-ID: <tkrat.fa84003ee3873879@s5r6.in-berlin.de> Date: Sat, 6 Dec 2008 17:35:59 +0100 (CET) From: Stefan Richter <stefanr@...6.in-berlin.de> To: linux1394-devel@...ts.sourceforge.net cc: linux-kernel@...r.kernel.org Subject: [PATCH] ieee1394: ohci1394: flush MMIO writes before delay in initialization and replace busy-wait by msleep. Signed-off-by: Stefan Richter <stefanr@...6.in-berlin.de> --- drivers/ieee1394/ohci1394.c | 10 ++++++---- 1 file changed, 6 insertions(+), 4 deletions(-) Index: linux/drivers/ieee1394/ohci1394.c =================================================================== --- linux.orig/drivers/ieee1394/ohci1394.c +++ linux/drivers/ieee1394/ohci1394.c @@ -3199,15 +3199,16 @@ static int __devinit ohci1394_pci_probe( /* Now enable LPS, which we need in order to start accessing * most of the registers. In fact, on some cards (ALI M5251), * accessing registers in the SClk domain without LPS enabled - * will lock up the machine. Wait 50msec to make sure we have - * full link enabled. */ + * will lock up the machine. */ reg_write(ohci, OHCI1394_HCControlSet, OHCI1394_HCControl_LPS); /* Disable and clear interrupts */ reg_write(ohci, OHCI1394_IntEventClear, 0xffffffff); reg_write(ohci, OHCI1394_IntMaskClear, 0xffffffff); - mdelay(50); + /* Flush MMIO writes and wait to make sure we have full link enabled. */ + reg_read(ohci, OHCI1394_Version); + msleep(50); /* Determine the number of available IR and IT contexts. */ ohci->nb_iso_rcv_ctx = @@ -3422,7 +3423,8 @@ static int ohci1394_pci_resume(struct pc reg_write(ohci, OHCI1394_HCControlSet, OHCI1394_HCControl_LPS); reg_write(ohci, OHCI1394_IntEventClear, 0xffffffff); reg_write(ohci, OHCI1394_IntMaskClear, 0xffffffff); - mdelay(50); + reg_read(ohci, OHCI1394_Version); + msleep(50); err = request_irq(dev->irq, ohci_irq_handler, IRQF_SHARED, OHCI1394_DRIVER_NAME, ohci); -- Stefan Richter -=====-==--- ==-- --==- http://arcgraph.de/sr/ -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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