Re: [PATCH v3 5/5] wifi: brcmfmac: Add support for AP6275P

[Arend Van Spriel]

On June 30, 2024 9:36:40 AM Jacobe Zang <jacobe.zang@xxxxxxxxxx> wrote:

> This module features BCM43752A2 chipset. The firmware requires
> randomness seeding, so enabled it.
>
> Co-developed-by: Ondrej Jirman <megi@xxxxxx>
> Signed-off-by: Ondrej Jirman <megi@xxxxxx>
> Signed-off-by: Jacobe Zang <jacobe.zang@xxxxxxxxxx>
> Link: 
> https://megous.com/git/linux/commit/?h=ap6275p-6.10&id=1a99573bc8ed412e60e1969c0b29d53a0e5782e0
> ---
> drivers/net/wireless/broadcom/brcm80211/brcmfmac/pcie.c      | 5 ++++-
> .../net/wireless/broadcom/brcm80211/include/brcm_hw_ids.h    | 2 ++
> 2 files changed, 6 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/pcie.c 
> b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/pcie.c
> index e84f562fc91b8..f427d664cf3a5 100644
> --- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/pcie.c
> +++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/pcie.c

[...]

> @@ -1721,7 +1723,7 @@ static int brcmf_pcie_download_fw_nvram(struct 
> brcmf_pciedev_info *devinfo,
>  memcpy_toio(devinfo->tcm + address, nvram, nvram_len);
>  brcmf_fw_nvram_free(nvram);
>
> - if (devinfo->otp.valid) {
> + if (devinfo->otp.valid || devinfo->ci->chip

So the problem here is that otp validity is not unambiguous. The seed 
requirement is mandated by firmware and was introduced for new WCC chips 
moving forward.

I would suggest to have a need_seed flag in the driver_data of the device 
table (below). It currently is used only for vendor identification.

Regards,
Arend

> == BRCM_CC_43752_CHIP_ID) {
>  size_t rand_len = BRCMF_RANDOM_SEED_LENGTH;
>  struct brcmf_random_seed_footer footer = {
>  .length = cpu_to_le32(rand_len),
> @@ -2710,6 +2712,7 @@ static const struct pci_device_id 
> brcmf_pcie_devid_table[] = {
>  BRCMF_PCIE_DEVICE(BRCM_PCIE_4366_5G_DEVICE_ID, BCA),
>  BRCMF_PCIE_DEVICE(BRCM_PCIE_4371_DEVICE_ID, WCC),
>  BRCMF_PCIE_DEVICE(BRCM_PCIE_43596_DEVICE_ID, CYW),
> + BRCMF_PCIE_DEVICE(BRCM_PCIE_43752_DEVICE_ID, WCC),
>  BRCMF_PCIE_DEVICE(BRCM_PCIE_4377_DEVICE_ID, WCC),
>  BRCMF_PCIE_DEVICE(BRCM_PCIE_4378_DEVICE_ID, WCC),
>  BRCMF_PCIE_DEVICE(BRCM_PCIE_4387_DEVICE_ID, WCC),

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