linux-kernel - [PATCH 2/4] interconnect: Add get

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Message-Id: <20200709110705.30359-3-georgi.djakov@linaro.org>
Date:   Thu,  9 Jul 2020 14:07:03 +0300
From:   Georgi Djakov <georgi.djakov@...aro.org>
To:     linux-pm@...r.kernel.org
Cc:     saravanak@...gle.com, mdtipton@...eaurora.org,
        okukatla@...eaurora.org, bjorn.andersson@...aro.org,
        vincent.guittot@...aro.org, georgi.djakov@...aro.org,
        linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 2/4] interconnect: Add get_bw() callback

The interconnect controller hardware may support querying the current
bandwidth settings, so add a callback for providers to implement this
functionality if supported.

Signed-off-by: Georgi Djakov <georgi.djakov@...aro.org>
---
 drivers/interconnect/core.c           | 3 ++-
 include/linux/interconnect-provider.h | 2 ++
 2 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/interconnect/core.c b/drivers/interconnect/core.c
index e53adfee1ee3..edbfe8380e83 100644
--- a/drivers/interconnect/core.c
+++ b/drivers/interconnect/core.c
@@ -926,7 +926,8 @@ void icc_node_add(struct icc_node *node, struct icc_provider *provider)
 	list_add_tail(&node->node_list, &provider->nodes);
 
 	/* get the bandwidth value and sync it with the hardware */
-	if (node->init_bw && provider->set) {
+	if (provider->get_bw && provider->set) {
+		provider->get_bw(node, &node->init_bw);
 		node->peak_bw = node->init_bw;
 		provider->set(node, node);
 	}
diff --git a/include/linux/interconnect-provider.h b/include/linux/interconnect-provider.h
index 153fb7616f96..329eccb19f58 100644
--- a/include/linux/interconnect-provider.h
+++ b/include/linux/interconnect-provider.h
@@ -38,6 +38,7 @@ struct icc_node *of_icc_xlate_onecell(struct of_phandle_args *spec,
  * @aggregate: pointer to device specific aggregate operation function
  * @pre_aggregate: pointer to device specific function that is called
  *		   before the aggregation begins (optional)
+ * @get_bw: pointer to device specific function to get current bandwidth
  * @xlate: provider-specific callback for mapping nodes from phandle arguments
  * @dev: the device this interconnect provider belongs to
  * @users: count of active users
@@ -50,6 +51,7 @@ struct icc_provider {
 	int (*aggregate)(struct icc_node *node, u32 tag, u32 avg_bw,
 			 u32 peak_bw, u32 *agg_avg, u32 *agg_peak);
 	void (*pre_aggregate)(struct icc_node *node);
+	int (*get_bw)(struct icc_node *node, u32 *bw);
 	struct icc_node* (*xlate)(struct of_phandle_args *spec, void *data);
 	struct device		*dev;
 	int			users;