linux-kernel - RE: [PATCH v2] rtlwifi: rtl8723be: Disable ASPM if RTL8723BE connects to Intel PCI bridge

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Date:   Tue, 14 Nov 2023 01:41:20 +0000
From:   Ping-Ke Shih <pkshih@...ltek.com>
To:     Jian-Hong Pan <jhp@...lessos.org>,
        Larry Finger <Larry.Finger@...inger.net>
CC:     Kalle Valo <kvalo@...nel.org>,
        "linux-wireless@...r.kernel.org" <linux-wireless@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux@...lessos.org" <linux@...lessos.org>
Subject: RE: [PATCH v2] rtlwifi: rtl8723be: Disable ASPM if RTL8723BE connects to Intel PCI bridge



> -----Original Message-----
> From: Jian-Hong Pan <jhp@...lessos.org>
> Sent: Monday, November 13, 2023 12:35 PM
> To: Larry Finger <Larry.Finger@...inger.net>; Ping-Ke Shih <pkshih@...ltek.com>
> Cc: Kalle Valo <kvalo@...nel.org>; linux-wireless@...r.kernel.org; linux-kernel@...r.kernel.org;
> linux@...lessos.org; Jian-Hong Pan <jhp@...lessos.org>
> Subject: [PATCH v2] rtlwifi: rtl8723be: Disable ASPM if RTL8723BE connects to Intel PCI bridge
> 
> Disable rtl8723be's ASPM if the Realtek RTL8723BE PCIe Wireless adapter
> connects to some Intel PCI bridges, such as Skylake and Kabylake.
> Otherwise, the PCI AER flood hangs system:
> 
> pcieport 0000:00:1c.5: PCIe Bus Error: severity=Corrected, type=Physical Layer, (Receiver ID)
> pcieport 0000:00:1c.5:   device [8086:9d15] error status/mask=00000001/00002000
> pcieport 0000:00:1c.5:    [ 0] RxErr                  (First)
> pcieport 0000:00:1c.5: AER: Corrected error received: 0000:00:1c.5
> pcieport 0000:00:1c.5: AER: can't find device of ID00e5
> pcieport 0000:00:1c.5: AER: Corrected error received: 0000:00:1c.5
> pcieport 0000:00:1c.5: AER: can't find device of ID00e5
> pcieport 0000:00:1c.5: AER: Multiple Corrected error received: 0000:00:1c.5
> pcieport 0000:00:1c.5: AER: can't find device of ID00e5
> 
> Buglink: https://bugzilla.kernel.org/show_bug.cgi?id=218127

Seemingly, you can use "Link" or "Closes" tag.

> Signed-off-by: Jian-Hong Pan <jhp@...lessos.org>

Acked-by: Ping-Ke Shih <pkshih@...ltek.com>


> ---
> v2: Add the switch case's default condition with comment:
>     "The ASPM has already been enabled by initializing
>     rtl8723be_mod_params' aspm_support as 1."
> 
>  .../wireless/realtek/rtlwifi/rtl8723be/sw.c   | 24 +++++++++++++++++++
>  1 file changed, 24 insertions(+)
> 
> diff --git a/drivers/net/wireless/realtek/rtlwifi/rtl8723be/sw.c
> b/drivers/net/wireless/realtek/rtlwifi/rtl8723be/sw.c
> index 43b611d5288d..b20c0b9d8393 100644
> --- a/drivers/net/wireless/realtek/rtlwifi/rtl8723be/sw.c
> +++ b/drivers/net/wireless/realtek/rtlwifi/rtl8723be/sw.c
> @@ -25,10 +25,34 @@ static void rtl8723be_init_aspm_vars(struct ieee80211_hw *hw)
>  {
>         struct rtl_priv *rtlpriv = rtl_priv(hw);
>         struct rtl_pci *rtlpci = rtl_pcidev(rtl_pcipriv(hw));
> +       struct pci_dev *bridge_pdev;
> 
>         /*close ASPM for AMD defaultly */
>         rtlpci->const_amdpci_aspm = 0;
> 
> +       /* Disable ASPM if RTL8723BE connects to some Intel PCI bridges, such as
> +        * Skylake and Kabylake. Otherwise, the PCI AER flood hangs system.
> +        */
> +       bridge_pdev = rtlpci->pdev->bus->self;
> +       if (bridge_pdev->vendor == PCI_VENDOR_ID_INTEL) {
> +               switch(bridge_pdev->device) {
> +               case 0x9d15:
> +               /* PCI bridges on Skylake */
> +               case 0xa110 ... 0xa11f:
> +               case 0xa167 ... 0xa16a:
> +               /* PCI bridges on Kabylake */
> +               case 0xa290 ... 0xa29f:
> +               case 0xa2e7 ... 0xa2ee:

Out of curiosity, do you have so many real platforms to test?