Re: [PATCH 1/2] mwifiex: Use non-posted PCI register writes
From: Andy Shevchenko <hidden>
Date: 2021-09-23 19:42:11
Also in:
linux-pci, lkml, netdev
On Thu, Sep 23, 2021 at 6:28 PM Jonas Dreßler [off-list ref] wrote:
On 9/22/21 2:50 PM, Jonas Dreßler wrote:
...
- Just calling mwifiex_write_reg() once and then blocking until the card wakes up using my delay-loop doesn't fix the issue, it's actually writing multiple times that fixes the issue These observations sound a lot like writes (and even reads) are actually being dropped, don't they?
It sounds like you're writing into a not ready (fully powered on) device.
To check this, try to put a busy loop for reading and check the value
till it gets 0.
Something like
unsigned int count = 1000;
do {
if (mwifiex_read_reg(...) == 0)
break;
} while (--count);
--
With Best Regards,
Andy Shevchenko