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ssb: add delay after PCI reset to fix SoC reboots 

Signed-off-by: Rafał Miłecki <zajec5@gmail.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
This commit is contained in:
Rafał Miłecki 2015-04-05 18:39:27 +02:00 committed by Kalle Valo
parent 61b559dea4
commit f56d9e23b7
1 changed files with 9 additions and 0 deletions
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9
drivers/ssb/driver_pcicore.c
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@ -357,6 +357,15 @@ static void ssb_pcicore_init_hostmode(struct ssb_pcicore *pc)
pcicore_write32(pc, SSB_PCICORE_SBTOPCI2,
SSB_PCICORE_SBTOPCI_MEM | SSB_PCI_DMA);
/*
* Accessing PCI config without a proper delay after devices reset (not
* GPIO reset) was causing reboots on WRT300N v1.0.
* Tested delay 850 us lowered reboot chance to 50-80%, 1000 us fixed it
* completely. Flushing all writes was also tested but with no luck.
*/
if (pc->dev->bus->chip_id == 0x4704)
usleep_range(1000, 2000);
/* Enable PCI bridge BAR0 prefetch and burst */
val = PCI_COMMAND_MASTER | PCI_COMMAND_MEMORY;
ssb_extpci_write_config(pc, 0, 0, 0, PCI_COMMAND, &val, 2);