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Subject: Re: [PATCH] ath11k: Advertise PLATFORM_CAP_PCIE_GLOBAL_RESET in qmi
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From:   Kalle Valo <kvalo@kernel.org>
In-Reply-To: <20211011055602.77342-1-bqiang@codeaurora.org>
References: <20211011055602.77342-1-bqiang@codeaurora.org>
To:     Baochen Qiang <bqiang@codeaurora.org>
Cc:     ath11k@lists.infradead.org, linux-wireless@vger.kernel.org
User-Agent: pwcli/0.1.0-git (https://github.com/kvalo/pwcli/) Python/3.7.3
Message-ID: <164802639004.545.3440948645378979467.kvalo@kernel.org>
Date:   Wed, 23 Mar 2022 09:06:32 +0000 (UTC)
Precedence: bulk

Baochen Qiang <bqiang@codeaurora.org> wrote:

> In Qualcomm ARM platforms there is WL_EN pin and other power regulators
> which can be controlled at platform side to completely reset the chip.
> For most of x86 and other platforms, the chip is connected via PCIe M.2
> interface, and there is no way to control WL_EN pin. Instead the host
> driver needs to reset the chip via PCIE_SOC_GLOBAL_RESET hardware
> register, just like ath11k does currently.
> 
> But when using PCIE_SOC_GLOBAL_RESET there are some hardware registers
> which are not cleared/restored. To handle those cases we can enable
> PLATFORM_CAP_PCIE_GLOBAL_RESET QMI host capability to tell the firmware
> to do some platform specific operations after firmware download.
> 
> This does not fix any known issues, but is recommended by the firmware
> team, so enable the capability on QCA6390 and WCN6855 PCI devices. It is
> currently unclear if this should be enabled also on QCN9074, so leave it
> disabled for now. On AHB devices this is not needed as they don't use
> PCIE_SOC_GLOBAL_RESET.
> 
> Tested-on: WCN6855 hw2.0 PCI WLAN.HSP.1.1-01720.1-QCAHSPSWPL_V1_V2_SILICONZ_LITE-1
> 
> Signed-off-by: Baochen Qiang <bqiang@codeaurora.org>
> Signed-off-by: Kalle Valo <quic_kvalo@quicinc.com>

Patch applied to ath-next branch of ath.git, thanks.

1e4ac7173c93 ath11k: enable PLATFORM_CAP_PCIE_GLOBAL_RESET QMI host capability

-- 
https://patchwork.kernel.org/project/linux-wireless/patch/20211011055602.77342-1-bqiang@codeaurora.org/

https://wireless.wiki.kernel.org/en/developers/documentation/submittingpatches