On Wed, Dec 9, 2020 at 10:47 PM Emmanuel Grumbach <egrumbach@xxxxxxxxx> wrote:
>
> On Wed, Dec 9, 2020 at 10:40 PM Rui Salvaterra <rsalvaterra@xxxxxxxxx> wrote:
> >
> > Hi, Emmanuel,
> >
> > On Wed, 9 Dec 2020 at 20:32, Emmanuel Grumbach <egrumbach@xxxxxxxxx> wrote:
> > >
> > > Rui, I looked at the register dump and looks like you're using AMT on
> > > your system?
> > > Can you confirm?
> >
> > AMT? You mean Intel Active Management? Heavens, no, not that I know
> > of! This is a personal laptop (Lenovo B51-80). (And I'd personally
> > kill the ME with fire, if I could.)
>
> Yes, I mean that thing. No VPRO sticker on the laptop?
> Weird... So apparently I was wrong about the register value.
Indeed, the bit is reverse logic. So we can put that aside.
Frankly, I have no clue. You can try our backport tree to bisect,
should be easier..
What I see here is that your GP_CTRL value is 080003d8
#define CSR_GP_CNTRL_REG_FLAG_HW_RF_KILL_SW (0x08000000)
which means sense since apparently, HW RF-Kill was asserted.
#define CSR_GP_CNTRL_REG_FLAG_GOING_TO_SLEEP (0x00000010)
Which means that the device is going to sleep... And that's the problem:
iwl_trans_pcie_grab_nic_access:
ret = iwl_poll_bit(trans, CSR_GP_CNTRL,
CSR_GP_CNTRL_REG_VAL_MAC_ACCESS_EN,
(CSR_GP_CNTRL_REG_FLAG_MAC_CLOCK_READY |
CSR_GP_CNTRL_REG_FLAG_GOING_TO_SLEEP), 15000);
if (unlikely(ret < 0)) {
u32 cntrl = iwl_read32(trans, CSR_GP_CNTRL);
WARN_ONCE(1,
"Timeout waiting for hardware access
(CSR_GP_CNTRL 0x%08x)\n",
cntrl);
but I'd expect the splat in your log...
Or maybe you can't load the firmware?
Can you try this:
diff --git a/drivers/net/wireless/intel/iwlwifi/pcie/trans.c
b/drivers/net/wireless/intel/iwlwifi/pcie/trans.c
index 2fffbbc8462f..748300752630 100644
--- a/drivers/net/wireless/intel/iwlwifi/pcie/trans.c
+++ b/drivers/net/wireless/intel/iwlwifi/pcie/trans.c
@@ -2121,6 +2121,7 @@ static bool
iwl_trans_pcie_grab_nic_access(struct iwl_trans *trans,
* track nic_access anyway.
*/
__release(&trans_pcie->reg_lock);
+ mdelay(1);
return true;
}
If that helps, then... I'd have no clue why it helps, but this
specific device caused us trouble like bad timing after
grab_nic_access..
>
> >
> > Thanks,
> > Rui
