linux-kernel - Re: [PATCH v1 2/4] brcmfmac: pcie: Add IDs/properties for BCM4355

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Date:   Wed, 4 Jan 2023 14:35:17 +0100
From:   Arend van Spriel <arend.vanspriel@...adcom.com>
To:     Hector Martin <marcan@...can.st>,
        Arend van Spriel <aspriel@...il.com>,
        Franky Lin <franky.lin@...adcom.com>,
        Hante Meuleman <hante.meuleman@...adcom.com>,
        Kalle Valo <kvalo@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>
Cc:     Alexander Prutskov <alep@...ress.com>,
        Chi-Hsien Lin <chi-hsien.lin@...ress.com>,
        Wright Feng <wright.feng@...ress.com>,
        Ian Lin <ian.lin@...ineon.com>,
        Soontak Lee <soontak.lee@...ress.com>,
        Joseph chuang <jiac@...ress.com>,
        Sven Peter <sven@...npeter.dev>,
        Alyssa Rosenzweig <alyssa@...enzweig.io>,
        asahi@...ts.linux.dev, linux-wireless@...r.kernel.org,
        brcm80211-dev-list.pdl@...adcom.com,
        SHA-cyfmac-dev-list@...ineon.com, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1 2/4] brcmfmac: pcie: Add IDs/properties for BCM4355

On 1/4/2023 11:01 AM, 'Hector Martin' via BRCM80211-DEV-LIST,PDL wrote:
> This chip is present on at least these Apple T2 Macs:
> 
> * hawaii: MacBook Air 13" (Late 2018)
> * hawaii: MacBook Air 13" (True Tone, 2019)
> 
> Users report seeing PCI revision ID 12 for this chip, which Arend
> reports should be revision C2, but Apple has the firmware tagged as
> revision C1. Assume the right cutoff point for firmware versions is
> revision ID 11 then, and leave older revisions using the non-versioned
> firmware filename (Apple only uses C1 firmware builds).

Reviewed-by: Arend van Spriel <arend.vanspriel@...adcom.com>
> Signed-off-by: Hector Martin <marcan@...can.st>
> ---
>   .../net/wireless/broadcom/brcm80211/brcmfmac/pcie.c    | 10 +++++++++-
>   .../wireless/broadcom/brcm80211/include/brcm_hw_ids.h  |  1 +
>   2 files changed, 10 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/pcie.c b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/pcie.c
> index 3264be485e20..bb4faea0f0b6 100644
> --- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/pcie.c
> +++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/pcie.c

[...]

> @@ -1994,6 +1996,11 @@ static int brcmf_pcie_read_otp(struct brcmf_pciedev_info *devinfo)
>   	int ret;
>   
>   	switch (devinfo->ci->chip) {
> +	case BRCM_CC_4355_CHIP_ID:
> +		coreid = BCMA_CORE_CHIPCOMMON;
> +		base = 0x8c0;
> +		words = 0xb2;
> +		break;
>   	case BRCM_CC_4378_CHIP_ID:
>   		coreid = BCMA_CORE_GCI;
>   		base = 0x1120;

This bit is not described in the commit message. Can you remind me why 
the driver needs to read OTP?

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