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Date: Sun, 21 May 2023 21:10:25 +0300
From: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To: Manikanta Mylavarapu <quic_mmanikan@...cinc.com>
Cc: Sricharan Ramabadhran <quic_srichara@...cinc.com>,
agross@...nel.org, andersson@...nel.org, konrad.dybcio@...aro.org,
robh+dt@...nel.org, krzysztof.kozlowski+dt@...aro.org,
jassisinghbrar@...il.com, mathieu.poirier@...aro.org,
mturquette@...libre.com, sboyd@...nel.org, quic_gurus@...cinc.com,
loic.poulain@...aro.org, quic_eberman@...cinc.com,
robimarko@...il.com, linux-arm-msm@...r.kernel.org,
devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-remoteproc@...r.kernel.org, linux-clk@...r.kernel.org,
quic_gokulsri@...cinc.com, quic_sjaganat@...cinc.com,
quic_kathirav@...cinc.com, quic_arajkuma@...cinc.com,
quic_anusha@...cinc.com, quic_poovendh@...cinc.com
Subject: Re: [PATCH 08/11] remoteproc: qcom: Add Hexagon based multipd rproc driver
On Sun, 21 May 2023 at 18:48, Manikanta Mylavarapu
<quic_mmanikan@...cinc.com> wrote:
>
>
>
> On 3/7/2023 6:47 PM, Sricharan Ramabadhran wrote:
> >
> >
> > On 3/7/2023 10:11 AM, Manikanta Mylavarapu wrote:
> >> APSS brings Q6 out of reset and then Q6 brings
> >> WCSS block (wifi radio's) out of reset.
> >>
> >> ---------------
> >> --> |WiFi 2G radio|
> >> | --------------
> >> |
> >> -------- ------- |
> >> | APSS | ---> |QDSP6| -----|
> >> --------- ------- |
> >> |
> >> |
> >> | --------------
> >> --> |WiFi 5G radio|
> >> --------------
> >>
> >> Problem here is if any radio crashes, subsequently other
> >> radio also should crash because Q6 crashed. Let's say
> >> 2G radio crashed, Q6 should pass this info to APSS. Only
> >> Q6 processor interrupts registered with APSS. Obviously
> >> Q6 should crash and raise fatal interrupt to APSS. Due
> >> to this 5G radio also crashed. But no issue in 5G radio,
> >> because of 2G radio crash 5G radio also impacted.
> >>
> >> In multi pd model, this problem is resolved. Here WCSS
> >> functionality (WiFi radio's) moved out from Q6 root pd
> >> to a separate user pd. Due to this, radio's independently
> >> pass their status info to APPS with out crashing Q6. So
> >> other radio's won't be impacted.
> >>
> >> ---------
> >> |WiFi |
> >> --> |2G radio|
> >> | ---------
> >> ------ Start Q6 ------- |
> >> | | ------------------> | | |
> >> | | Start WCSS PD1 (2G) | | |
> >> |APSS| ----------------------->|QDSP6|-----|
> >> | | Start WCSS PD1 (5G) | |
> >> | | ----------------------->| |-----|
> >> ------ ------- |
> >> |
> >> | -----------
> >> |-->|WiFi |
> >> |5G radio |
> >> -----------
> >> According to linux terminology, here consider Q6 as root
> >> i.e it provide all services, WCSS (wifi radio's) as user
> >> i.e it uses services provided by root.
> >>
> >> Since Q6 root & WCSS user pd's able to communicate with
> >> APSS individually, multipd remoteproc driver registers
> >> each PD with rproc framework. Here clients (Wifi host drivers)
> >> intrested on WCSS PD rproc, so multipd driver start's root
> >> pd in the context of WCSS user pd rproc start. Similarly
> >> on down path, root pd will be stopped after wcss user pd
> >> stopped.
> >>
> >> Here WCSS(user) PD is dependent on Q6(root) PD, so first
> >> q6 pd should be up before wcss pd. After wcss pd goes down,
> >> q6 pd should be turned off.
> >>
> >> rproc->ops->start(userpd_rproc) {
> >> /* Boot root pd rproc */
> >> rproc_boot(upd_dev->parent);
> >> ---
> >> /* user pd rproc start sequence */
> >> ---
> >> ---
> >> }
> >> With this way we ensure that root pd brought up before userpd.
> >>
> >> rproc->ops->stop(userpd_rproc) {
> >> ---
> >> ---
> >> /* user pd rproc stop sequence */
> >> ---
> >> ---
> >> /* Shutdown root pd rproc */
> >> rproc_shutdown(upd_dev->parent);
> >> }
> >> After userpd rproc stops, root pd rproc will be stopped.
> >> IPQ5018, IPQ9574 supports multipd remoteproc driver.
> >>
> >> Signed-off-by: Manikanta Mylavarapu <quic_mmanikan@...cinc.com>
> >> ---
> >> drivers/firmware/qcom_scm.c | 114 +++++
> >> drivers/firmware/qcom_scm.h | 6 +
> >> drivers/remoteproc/Kconfig | 20 +
> >> drivers/remoteproc/Makefile | 1 +
> >> drivers/remoteproc/qcom_common.c | 23 +
> >> drivers/remoteproc/qcom_common.h | 1 +
> >> drivers/remoteproc/qcom_q6v5.c | 41 +-
> >> drivers/remoteproc/qcom_q6v5.h | 15 +-
> >> drivers/remoteproc/qcom_q6v5_adsp.c | 5 +-
> >> drivers/remoteproc/qcom_q6v5_mpd.c | 668 +++++++++++++++++++++++++
> >> drivers/remoteproc/qcom_q6v5_mss.c | 4 +-
> >> drivers/remoteproc/qcom_q6v5_pas.c | 3 +-
> >> drivers/soc/qcom/mdt_loader.c | 314 ++++++++++++
> >> include/linux/firmware/qcom/qcom_scm.h | 3 +
> >> include/linux/soc/qcom/mdt_loader.h | 19 +
> >> 15 files changed, 1228 insertions(+), 9 deletions(-)
> >> create mode 100644 drivers/remoteproc/qcom_q6v5_mpd.c
> >>
> >> diff --git a/drivers/firmware/qcom_scm.c b/drivers/firmware/qcom_scm.c
> >> index d88c5f14bd54..d69560963353 100644
> >> --- a/drivers/firmware/qcom_scm.c
> >> +++ b/drivers/firmware/qcom_scm.c
> >> @@ -654,6 +654,120 @@ int qcom_scm_pas_shutdown(u32 peripheral)
> >> }
> >> EXPORT_SYMBOL(qcom_scm_pas_shutdown);
> >> +/**
> >> + * qti_scm_int_radio_powerup - Bring up internal radio userpd
> >> + *
> >> + * @peripheral: peripheral id
> >> + *
> >> + * Return 0 on success.
> >> + */
> >> +int qti_scm_int_radio_powerup(u32 peripheral)
> >> +{
> >
> > qcom instead and in other places too.
> >
> Internal open source team suggested to use qti.
All existing drivers use qcom_ prefix. Other functions in qcom_scm.c
use qcom_ prefix. Please stick to it.
--
With best wishes
Dmitry
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