Commit f56d9e23 authored by Rafał Miłecki's avatar Rafał Miłecki Committed by Kalle Valo
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ssb: add delay after PCI reset to fix SoC reboots 



Signed-off-by: default avatarRafał Miłecki <zajec5@gmail.com>
Signed-off-by: default avatarKalle Valo <kvalo@codeaurora.org>
parent 61b559de

drivers/ssb/driver_pcicore.c

+9 −0
Original line number Diff line number Diff line
@@ -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);