linux-kernel - [PATCH v7 3/3] soc: qcom: rpmh: Invoke rpmh

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Date:   Wed, 26 Feb 2020 10:57:13 +0530
From:   Maulik Shah <mkshah@...eaurora.org>
To:     swboyd@...omium.org, mka@...omium.org, evgreen@...omium.org,
        bjorn.andersson@...aro.org
Cc:     linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        agross@...nel.org, dianders@...omium.org, rnayak@...eaurora.org,
        ilina@...eaurora.org, lsrao@...eaurora.org,
        Maulik Shah <mkshah@...eaurora.org>
Subject: [PATCH v7 3/3] soc: qcom: rpmh: Invoke rpmh_flush for dirty caches

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
deepest low power mode.

Signed-off-by: Maulik Shah <mkshah@...eaurora.org>
Reviewed-by: Srinivas Rao L <lsrao@...eaurora.org>
---
 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())
+		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);
 		return 0;
 	}
 
-- 
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