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

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Message-ID: <05390e0b-27fd-4190-971e-e70a498c8221@lwfinger.net>
Date:   Fri, 10 Nov 2023 14:04:01 -0600
From:   Larry Finger <Larry.Finger@...inger.net>
To:     Jian-Hong Pan <jhp@...lessos.org>,
        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
Subject: Re: [PATCH] rtlwifi: rtl8723be: Disable ASPM if RTL8723BE connects to
 some Intel PCI bridge

On 11/10/23 04:32, Jian-Hong Pan wrote:
> 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
> Signed-off-by: Jian-Hong Pan <jhp@...lessos.org>
> ---
>   .../wireless/realtek/rtlwifi/rtl8723be/sw.c   | 19 +++++++++++++++++++
>   1 file changed, 19 insertions(+)
> 
> diff --git a/drivers/net/wireless/realtek/rtlwifi/rtl8723be/sw.c b/drivers/net/wireless/realtek/rtlwifi/rtl8723be/sw.c
> index 43b611d5288d..720c79e0781a 100644
> --- a/drivers/net/wireless/realtek/rtlwifi/rtl8723be/sw.c
> +++ b/drivers/net/wireless/realtek/rtlwifi/rtl8723be/sw.c
> @@ -25,10 +25,29 @@ 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:
> +			rtlpriv->cfg->mod_params->aspm_support = 0;
> +			break;
> +		}
> +	}
> +
>   	/* ASPM PS mode.
>   	 * 0 - Disable ASPM,
>   	 * 1 - Enable ASPM without Clock Req,

Does the switch statement need a default case in the event that Intel offers a 
compatible AP?

Larry