Re: [PATCH v2 2/2] soc: qcom: pmic_glink: Handle GLINK intent allocation rejections

[Chris Lew <quic_clew@quicinc.com>]

On 10/23/2024 10:24 AM, Bjorn Andersson wrote:
> Some versions of the pmic_glink firmware does not allow dynamic GLINK
> intent allocations, attempting to send a message before the firmware has
> allocated its receive buffers and announced these intent allocations
> will fail. When this happens something like this showns up in the log:
> 
>      pmic_glink_altmode.pmic_glink_altmode pmic_glink.altmode.0: failed to send altmode request: 0x10 (-125)
>      pmic_glink_altmode.pmic_glink_altmode pmic_glink.altmode.0: failed to request altmode notifications: -125
>      ucsi_glink.pmic_glink_ucsi pmic_glink.ucsi.0: failed to send UCSI read request: -125
>      qcom_battmgr.pmic_glink_power_supply pmic_glink.power-supply.0: failed to request power notifications
> 
> GLINK has been updated to distinguish between the cases where the remote
> is going down (-ECANCELED) and the intent allocation being rejected
> (-EAGAIN).
> 
> Retry the send until intent buffers becomes available, or an actual
> error occur.
> 
> To avoid infinitely waiting for the firmware in the event that this
> misbehaves and no intents arrive, an arbitrary 5 second timeout is
> used.
> 
> This patch was developed with input from Chris Lew.
> 
> Reported-by: Johan Hovold <johan@kernel.org>
> Closes: https://lore.kernel.org/all/Zqet8iInnDhnxkT9@hovoldconsulting.com/#t
> Cc: stable@vger.kernel.org # rpmsg: glink: Handle rejected intent request better
> Fixes: 58ef4ece1e41 ("soc: qcom: pmic_glink: Introduce base PMIC GLINK driver")
> Tested-by: Johan Hovold <johan+linaro@kernel.org>
> Reviewed-by: Johan Hovold <johan+linaro@kernel.org>
> Signed-off-by: Bjorn Andersson <bjorn.andersson@oss.qualcomm.com>
> ---

Reviewed-by: Chris Lew <quic_clew@quicinc.com>