Quoting Maulik Shah (2020-02-25 21:27:13)
> Add changes to invoke rpmh flush when the data in cache is dirty.
>
> This is done only if OSI is not supported in PSCI. If OSI is supported
> rpmh_flush can get invoked when the last cpu going to power collapse
Please write rpmh_flush() so we know it's a function and not a variable.
> deepest low power mode.
>
> Signed-off-by: Maulik Shah <mkshah@xxxxxxxxxxxxxx>
> Reviewed-by: Srinivas Rao L <lsrao@xxxxxxxxxxxxxx>
> ---
> drivers/soc/qcom/rpmh.c | 6 ++++++
> 1 file changed, 6 insertions(+)
>
> diff --git a/drivers/soc/qcom/rpmh.c b/drivers/soc/qcom/rpmh.c
> index 83ba4e0..839af8d 100644
> --- a/drivers/soc/qcom/rpmh.c
> +++ b/drivers/soc/qcom/rpmh.c
> @@ -12,6 +12,7 @@
> #include <linux/module.h>
> #include <linux/of.h>
> #include <linux/platform_device.h>
> +#include <linux/psci.h>
> #include <linux/slab.h>
> #include <linux/spinlock.h>
> #include <linux/types.h>
> @@ -163,6 +164,9 @@ static struct cache_req *cache_rpm_request(struct rpmh_ctrlr *ctrlr,
> unlock:
> spin_unlock_irqrestore(&ctrlr->cache_lock, flags);
>
> + if (ctrlr->dirty && !psci_has_osi_support())
Can we introduce a stub function for psci_has_osi_support() when
CONFIG_ARM_PSCI_FW=n? This driver currently has:
config QCOM_RPMH
bool "Qualcomm RPM-Hardened (RPMH) Communication"
depends on ARCH_QCOM && ARM64 || COMPILE_TEST
which implies that this will break build testing once built on something
that isn't arm64.
> + return rpmh_flush(ctrlr) ? ERR_PTR(-EINVAL) : req;
> +
> return req;
> }
>
> @@ -391,6 +395,8 @@ int rpmh_write_batch(const struct device *dev, enum rpmh_state state,
>
> if (state != RPMH_ACTIVE_ONLY_STATE) {
> cache_batch(ctrlr, req);
> + if (!psci_has_osi_support())
> + return rpmh_flush(ctrlr);
While the diff is small it is also sad that we turn around after adding
it to a list and immediately take it off the list and send it. Can't we
do this without having to do the list add/remove dance?
> return 0;
> }
>
