Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67;
DMARC-Filter: OpenDMARC Filter v1.3.2 smtp.codeaurora.org 830E2C4479F
From:   Maulik Shah <mkshah@codeaurora.org>
To:     swboyd@chromium.org, mka@chromium.org, evgreen@chromium.org,
        bjorn.andersson@linaro.org
Cc:     linux-kernel@vger.kernel.org, linux-arm-msm@vger.kernel.org,
        agross@kernel.org, dianders@chromium.org, rnayak@codeaurora.org,
        ilina@codeaurora.org, lsrao@codeaurora.org,
        Maulik Shah <mkshah@codeaurora.org>
Subject: [PATCH v10 2/3] soc: qcom: rpmh: Update dirty flag only when data changes
Date:   Tue,  3 Mar 2020 17:56:54 +0530
Message-Id: <1583238415-18686-3-git-send-email-mkshah@codeaurora.org>
In-Reply-To: <1583238415-18686-1-git-send-email-mkshah@codeaurora.org>
References: <1583238415-18686-1-git-send-email-mkshah@codeaurora.org>
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

Currently rpmh ctrlr dirty flag is set for all cases regardless of data
is really changed or not. Add changes to update dirty flag when data is
changed to newer values. Update dirty flag everytime when data in batch
cache is updated since rpmh_flush() may get invoked from any CPU instead
of only last CPU going to low power mode.

Also move dirty flag updates to happen from within cache_lock and remove
unnecessary INIT_LIST_HEAD() call and a default case from switch.

Fixes: 600513dfeef3 ("drivers: qcom: rpmh: cache sleep/wake state requests")
Signed-off-by: Maulik Shah <mkshah@codeaurora.org>
Reviewed-by: Srinivas Rao L <lsrao@codeaurora.org>
Reviewed-by: Evan Green <evgreen@chromium.org>
---
 drivers/soc/qcom/rpmh.c | 21 +++++++++++++--------
 1 file changed, 13 insertions(+), 8 deletions(-)

diff --git a/drivers/soc/qcom/rpmh.c b/drivers/soc/qcom/rpmh.c
index eb0ded0..f28afe4 100644
--- a/drivers/soc/qcom/rpmh.c
+++ b/drivers/soc/qcom/rpmh.c
@@ -133,26 +133,30 @@ static struct cache_req *cache_rpm_request(struct rpmh_ctrlr *ctrlr,
 
 	req->addr = cmd->addr;
 	req->sleep_val = req->wake_val = UINT_MAX;
-	INIT_LIST_HEAD(&req->list);
 	list_add_tail(&req->list, &ctrlr->cache);
 
 existing:
 	switch (state) {
 	case RPMH_ACTIVE_ONLY_STATE:
-		if (req->sleep_val != UINT_MAX)
+		if (req->sleep_val != UINT_MAX) {
 			req->wake_val = cmd->data;
+			ctrlr->dirty = true;
+		}
 		break;
 	case RPMH_WAKE_ONLY_STATE:
-		req->wake_val = cmd->data;
+		if (req->wake_val != cmd->data) {
+			req->wake_val = cmd->data;
+			ctrlr->dirty = true;
+		}
 		break;
 	case RPMH_SLEEP_STATE:
-		req->sleep_val = cmd->data;
-		break;
-	default:
+		if (req->sleep_val != cmd->data) {
+			req->sleep_val = cmd->data;
+			ctrlr->dirty = true;
+		}
 		break;
 	}
 
-	ctrlr->dirty = true;
 unlock:
 	spin_unlock_irqrestore(&ctrlr->cache_lock, flags);
 
@@ -287,6 +291,7 @@ static void cache_batch(struct rpmh_ctrlr *ctrlr, struct batch_cache_req *req)
 
 	spin_lock_irqsave(&ctrlr->cache_lock, flags);
 	list_add_tail(&req->list, &ctrlr->batch_cache);
+	ctrlr->dirty = true;
 	spin_unlock_irqrestore(&ctrlr->cache_lock, flags);
 }
 
@@ -323,6 +328,7 @@ static void invalidate_batch(struct rpmh_ctrlr *ctrlr)
 	list_for_each_entry_safe(req, tmp, &ctrlr->batch_cache, list)
 		kfree(req);
 	INIT_LIST_HEAD(&ctrlr->batch_cache);
+	ctrlr->dirty = true;
 	spin_unlock_irqrestore(&ctrlr->cache_lock, flags);
 }
 
@@ -507,7 +513,6 @@ int rpmh_invalidate(const struct device *dev)
 	int ret;
 
 	invalidate_batch(ctrlr);
-	ctrlr->dirty = true;
 
 	do {
 		ret = rpmh_rsc_invalidate(ctrlr_to_drv(ctrlr));
-- 
QUALCOMM INDIA, on behalf of Qualcomm Innovation Center, Inc. is a member
of Code Aurora Forum, hosted by The Linux Foundation