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[24.31.245.230]) by smtp.gmail.com with ESMTPSA id c78sm45549170oig.30.2019.01.05.08.37.02 (version=TLS1_3 cipher=AEAD-AES128-GCM-SHA256 bits=128/128); Sat, 05 Jan 2019 08:37:02 -0800 (PST) Subject: Re: [PATCH 1/4] rtlwifi: rtl8723ae: Take the FW LPS mode handling out To: Bernd Edlinger , Ping-Ke Shih , Kalle Valo , "David S. Miller" , "linux-wireless@vger.kernel.org" , "netdev@vger.kernel.org" , "linux-kernel@vger.kernel.org" References: <7c1f25bc-dfc6-56e2-745c-4607f0f41159@lwfinger.net> From: Larry Finger Message-ID: <8a594059-fdeb-9abf-24a3-c44cb429fea3@lwfinger.net> Date: Sat, 5 Jan 2019 10:37:01 -0600 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.3.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit Sender: linux-wireless-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-wireless@vger.kernel.org On 1/5/19 10:30 AM, Bernd Edlinger wrote: > On 1/5/19 5:13 PM, Larry Finger wrote: >>> but this works: >>> >>> modprobe rtl8723ae debug_mask=0xFFFFFFFF debug_level=5 swlps=1 fwlps=0 >> >> Yes, I think that is a better thing to do now. If and when Realtek finds a firmware bug, and when the new firmware is readily available, then there will not be a lot of code to reinstall. >> > > Okay, my assumption of how the firmware bug "works" is this: > > Once the firmware enters power save mode, it will deliver exactly one (or maybe two) > Rx interrupts. If one of those triggers the driver to leave the power save mode again, > the firmware continues to work. > If those are only beacons, they won't leave the power save mode. Then the firmware > will usually not recover. > Since prior to commit 873ffe154ae0 ("rtlwifi: Fix logic error in enter/exit power-save mode") > the power save mode was only activated when there _is_ busy traffic, the next > packet did usually wake the firmware, rarely it did freeze however. > Other things like changing the cck_packet_detection_threshold or refresh_rate_adaptive_mask > can also kick the firmware back to life. > > Hope this helps to track down the root cause of this bug. As I know nothing of the firmware, that is outside my expertise, but that observation should be of great help to PK Shih, and his colleagues at Realtek. Larry