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Mon, 24 Nov 2025 15:08:32 -0800 (PST) Date: Tue, 25 Nov 2025 02:08:31 +0300 From: Andrey Skvortsov To: Ping-Ke Shih Cc: "linux-wireless@vger.kernel.org" , "piotr.oniszczuk@gmail.com" , "rtl8821cerfe2@gmail.com" , "stable@vger.kernel.org" , "regressions@lists.linux.dev" , Martin Blumenstingl Subject: Re: [PATCH rtw-next] wifi: rtw88: sdio: use indirect IO for device registers before power-on Message-ID: Mail-Followup-To: Andrey Skvortsov , Ping-Ke Shih , "linux-wireless@vger.kernel.org" , "piotr.oniszczuk@gmail.com" , "rtl8821cerfe2@gmail.com" , "stable@vger.kernel.org" , "regressions@lists.linux.dev" , Martin Blumenstingl References: <20250724004815.7043-1-pkshih@realtek.com> <4562797ed9514344b562f7a8e58e6988@realtek.com> Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <4562797ed9514344b562f7a8e58e6988@realtek.com> On 25-11-24 08:16, Ping-Ke Shih wrote: > Andrey Skvortsov wrote: > > Hi, > > > > This patch was recently backported to stable kernels (v6.12.58) and it broke > > wlan on PinePhone, that uses 8723cs SDIO chip. The same problem > > appears of course on latest 6.18-rc6. Reverting this change resolves > > the problem. > > > > ``` > > $ sudo dmesg | grep -i rtw88 > > [ 24.940551] rtw88_8723cs mmc1:0001:1: WOW Firmware version 11.0.0, H2C version 0 > > [ 24.953085] rtw88_8723cs mmc1:0001:1: Firmware version 11.0.0, H2C version 0 > > [ 24.955892] rtw88_8723cs mmc1:0001:1: sdio read32 failed (0xf0): -110 I see it fails with timeout on the first operation to read chip version. > > [ 24.973135] rtw88_8723cs mmc1:0001:1: sdio write8 failed (0x1c): -110 > > [ 24.980673] rtw88_8723cs mmc1:0001:1: sdio read32 failed (0xf0): -110 > > ... > > [ 25.446691] rtw88_8723cs mmc1:0001:1: sdio read8 failed (0x100): -110 > > [ 25.453569] rtw88_8723cs mmc1:0001:1: mac power on failed > > [ 25.459077] rtw88_8723cs mmc1:0001:1: failed to power on mac > > [ 25.464841] rtw88_8723cs mmc1:0001:1: failed to setup chip efuse info > > [ 25.464856] rtw88_8723cs mmc1:0001:1: failed to setup chip information > > [ 25.478341] rtw88_8723cs mmc1:0001:1: probe with driver rtw88_8723cs failed with error -114 > > ``` > > > > Check original link of this patch [1] that 8822cs read incorrect from 0xf0 > resulting in "rtw88_8822cs mmc1:0001:1: unsupported rf path (1)". Sorry, I haven't meant, that this patch should be reverted. I see, that it solves real problem. I've meant, that patch caused this regression was identified and it was confirmed by reverting it. > I wonder if we can add additional checking rule of chip ID, like: I've tried suggested change and wlan is recognized again. > > --- a/drivers/net/wireless/realtek/rtw88/sdio.c > +++ b/drivers/net/wireless/realtek/rtw88/sdio.c > @@ -144,8 +144,10 @@ static u32 rtw_sdio_to_io_address(struct rtw_dev *rtwdev, u32 addr, > > static bool rtw_sdio_use_direct_io(struct rtw_dev *rtwdev, u32 addr) > { > + bool might_indirect_under_power_off = rtwdev->chip->id != RTW_CHIP_TYPE_8703B; > + > if (!test_bit(RTW_FLAG_POWERON, rtwdev->flags) && > - !rtw_sdio_is_bus_addr(addr)) > + !rtw_sdio_is_bus_addr(addr) && might_indirect_under_power_off) > return false; > > return !rtw_sdio_is_sdio30_supported(rtwdev) || > > [1] https://lore.kernel.org/linux-wireless/699C22B4-A3E3-4206-97D0-22AB3348EBF6@gmail.com/T/#t > -- Best regards, Andrey Skvortsov