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

From: Arend van Spriel
Date: Wed Jan 04 2023 - 08:37:55 EST

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@xxxxxxxxxxxx>
Signed-off-by: Hector Martin <marcan@xxxxxxxxx>
---
.../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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