Re: [PATCH 1/2] bus: mhi: core: add SBL state callback

From: Manivannan Sadhasivam <mani@kernel.org>
To: Robert Marko <robimarko@gmail.com>
Cc: kvalo@kernel.org, davem@davemloft.net, edumazet@google.com,
	kuba@kernel.org, pabeni@redhat.com, gregkh@linuxfoundation.org,
	elder@linaro.org, hemantk@codeaurora.org, quic_jhugo@quicinc.com,
	quic_qianyu@quicinc.com, bbhatt@codeaurora.org,
	mhi@lists.linux.dev, linux-arm-msm@vger.kernel.org,
	ath11k@lists.infradead.org, linux-wireless@vger.kernel.org,
	netdev@vger.kernel.org, ansuelsmth@gmail.com
Subject: Re: [PATCH 1/2] bus: mhi: core: add SBL state callback
Date: Mon, 7 Nov 2022 16:57:56 +0530	[thread overview]
Message-ID: <20221107112756.GB2220@thinkpad> (raw)
In-Reply-To: <20221105194943.826847-1-robimarko@gmail.com>

On Sat, Nov 05, 2022 at 08:49:42PM +0100, Robert Marko wrote:
> Add support for SBL state callback in MHI core.
> 
> It is required for ath11k MHI devices in order to be able to set QRTR
> instance ID in the SBL state so that QRTR instance ID-s dont conflict in
> case of multiple PCI/MHI cards or AHB + PCI/MHI card.
> Setting QRTR instance ID is only possible in SBL state and there is
> currently no way to ensure that we are in that state, so provide a
> callback that the controller can trigger off.
> 

Where can I find the corresponding ath11k patch that makes use of this
callback?

Thanks,
Mani

> Signed-off-by: Robert Marko <robimarko@gmail.com>
> ---
>  drivers/bus/mhi/host/main.c | 1 +
>  include/linux/mhi.h         | 2 ++
>  2 files changed, 3 insertions(+)
> 
> diff --git a/drivers/bus/mhi/host/main.c b/drivers/bus/mhi/host/main.c
> index df0fbfee7b78..8b03dd1f0cb8 100644
> --- a/drivers/bus/mhi/host/main.c
> +++ b/drivers/bus/mhi/host/main.c
> @@ -900,6 +900,7 @@ int mhi_process_ctrl_ev_ring(struct mhi_controller *mhi_cntrl,
>  			switch (event) {
>  			case MHI_EE_SBL:
>  				st = DEV_ST_TRANSITION_SBL;
> +				mhi_cntrl->status_cb(mhi_cntrl, MHI_CB_EE_SBL_MODE);
>  				break;
>  			case MHI_EE_WFW:
>  			case MHI_EE_AMSS:
> diff --git a/include/linux/mhi.h b/include/linux/mhi.h
> index a5441ad33c74..beffe102dd19 100644
> --- a/include/linux/mhi.h
> +++ b/include/linux/mhi.h
> @@ -34,6 +34,7 @@ struct mhi_buf_info;
>   * @MHI_CB_SYS_ERROR: MHI device entered error state (may recover)
>   * @MHI_CB_FATAL_ERROR: MHI device entered fatal error state
>   * @MHI_CB_BW_REQ: Received a bandwidth switch request from device
> + * @MHI_CB_EE_SBL_MODE: MHI device entered SBL mode
>   */
>  enum mhi_callback {
>  	MHI_CB_IDLE,
> @@ -45,6 +46,7 @@ enum mhi_callback {
>  	MHI_CB_SYS_ERROR,
>  	MHI_CB_FATAL_ERROR,
>  	MHI_CB_BW_REQ,
> +	MHI_CB_EE_SBL_MODE,
>  };
>  
>  /**
> -- 
> 2.38.1
> 

-- 
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