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SubjectRe: [PATCH 3/3] soc: qcom: Add AOSS QMP genpd provider
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Hi Bjorn,

On 11/12/2018 1:35 PM, Bjorn Andersson wrote:
> The AOSS QMP genpd provider implements control over power-related
> resources related to low-power state associated with the remoteprocs in
> the system as well as control over a set of clocks related to debug
> hardware in the SoC.
>
> Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
> ---
> drivers/soc/qcom/Kconfig | 8 ++
> drivers/soc/qcom/Makefile | 1 +
> drivers/soc/qcom/aoss-qmp-pd.c | 135 +++++++++++++++++++++++++++++++++
> 3 files changed, 144 insertions(+)
> create mode 100644 drivers/soc/qcom/aoss-qmp-pd.c
>
> diff --git a/drivers/soc/qcom/Kconfig b/drivers/soc/qcom/Kconfig
> index ba08fc00d7f5..e1eda3d59748 100644
> --- a/drivers/soc/qcom/Kconfig
> +++ b/drivers/soc/qcom/Kconfig
> @@ -10,6 +10,14 @@ config QCOM_AOSS_QMP
> micro-controller in the AOSS, using QMP, to control certain resource
> that are not exposed through RPMh.
>
> +config QCOM_AOSS_QMP_PD
> + tristate "Qualcomm AOSS Messaging Power Domain driver"
> + depends on QCOM_AOSS_QMP
> + help
> + This driver provides the means of controlling the AOSSs handling of
> + low-power state for resources related to the remoteproc subsystems as
> + well as controlling the debug clocks.
> +
> config QCOM_COMMAND_DB
> bool "Qualcomm Command DB"
> depends on ARCH_QCOM || COMPILE_TEST
> diff --git a/drivers/soc/qcom/Makefile b/drivers/soc/qcom/Makefile
> index d0d7fdc94d9a..ebfa414a5b77 100644
> --- a/drivers/soc/qcom/Makefile
> +++ b/drivers/soc/qcom/Makefile
> @@ -1,6 +1,7 @@
> # SPDX-License-Identifier: GPL-2.0
> CFLAGS_rpmh-rsc.o := -I$(src)
> obj-$(CONFIG_QCOM_AOSS_QMP) += aoss-qmp.o
> +obj-$(CONFIG_QCOM_AOSS_QMP_PD) += aoss-qmp-pd.o
> obj-$(CONFIG_QCOM_GENI_SE) += qcom-geni-se.o
> obj-$(CONFIG_QCOM_COMMAND_DB) += cmd-db.o
> obj-$(CONFIG_QCOM_GLINK_SSR) += glink_ssr.o
> diff --git a/drivers/soc/qcom/aoss-qmp-pd.c b/drivers/soc/qcom/aoss-qmp-pd.c
> new file mode 100644
> index 000000000000..467d0db4abfa
> --- /dev/null
> +++ b/drivers/soc/qcom/aoss-qmp-pd.c
> @@ -0,0 +1,135 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Copyright (c) 2018, Linaro Ltd
> + */
> +#include <linux/interrupt.h>
> +#include <linux/module.h>
> +#include <linux/of_platform.h>
> +#include <linux/platform_device.h>
> +#include <linux/pm_domain.h>
> +#include <linux/soc/qcom/aoss-qmp.h>
> +
> +#include <dt-bindings/power/qcom-aoss-qmp.h>
> +
> +struct qmp_pd {
> + struct qmp *qmp;
> +
> + struct generic_pm_domain pd;
> +
> + const char *name;
> +};
> +
> +#define to_qmp_pd_resource(res) container_of(res, struct qmp_pd, pd)
> +
> +struct qmp_pd_resource {
> + const char *name;
> + int (*on)(struct generic_pm_domain *domain);
> + int (*off)(struct generic_pm_domain *domain);
> +};
> +
> +static int qmp_pd_clock_toggle(struct qmp_pd *res, bool enable)
> +{
> + char buf[96];
> + size_t n;
> +
> + n = snprintf(buf, sizeof(buf), "{class: clock, res: %s, val: %d}",
> + res->name, !!enable);
> + return qmp_send(res->qmp, buf, n);
> +}
> +

I was trying to get QDSS working with these patches and found one issue
in qmp_send of qmp_pd_clock_toggle.

The third return value should be sizeof(buf) instead of n because n just
returns len as 33 and the below check in qmp send will always fail and
trigger WARN_ON's.

if (WARN_ON(len % sizeof(u32))) {
dev_err(qmp->dev, "message not 32-bit aligned\n");
return -EINVAL;
}

Also I observed that multiple "ucore will not ack channel" messages with
len being returned n instead of buf size.

One more thing is do we really require *WARN_ON and dev_err* both
because it just spams the kernel logs, I think dev_err message is clear
enough to be able to understand the error condition.

Thanks,
Sai

--
QUALCOMM INDIA, on behalf of Qualcomm Innovation Center, Inc. is a member
of Code Aurora Forum, hosted by The Linux Foundation

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