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| author | Rafał Miłecki <zajec5@gmail.com> | 2015-04-05 18:39:27 +0200 |
|---|---|---|
| committer | Kalle Valo <kvalo@codeaurora.org> | 2015-04-07 20:18:10 +0300 |
| commit | f56d9e23b78e311fbd992a1bd80b8bf2adaee29b (patch) | |
| tree | 25a92db4ae796d33dcaeecc92284b87bb4dda6e8 | |
| parent | 61b559dea40ec1712be4a0ea712a2922a8f38588 (diff) | |
| download | linux-f56d9e23b78e311fbd992a1bd80b8bf2adaee29b.tar.gz linux-f56d9e23b78e311fbd992a1bd80b8bf2adaee29b.tar.bz2 linux-f56d9e23b78e311fbd992a1bd80b8bf2adaee29b.zip | |
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>
| -rw-r--r-- | drivers/ssb/driver_pcicore.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/drivers/ssb/driver_pcicore.c b/drivers/ssb/driver_pcicore.c index d75b72ba2672..15a7ee3859dd 100644 --- a/drivers/ssb/driver_pcicore.c +++ b/drivers/ssb/driver_pcicore.c @@ -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); |