linux-kernel - [PATCH 5/5] drm/msm/mdp5: Use the interconnect API

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Message-Id: <20190618202425.15259-6-robdclark@gmail.com>
Date:   Tue, 18 Jun 2019 13:24:13 -0700
From:   Rob Clark <robdclark@...il.com>
To:     dri-devel@...ts.freedesktop.org
Cc:     linux-arm-msm@...r.kernel.org, Sean Paul <seanpaul@...omium.org>,
        Georgi Djakov <georgi.djakov@...aro.org>,
        Rob Clark <robdclark@...omium.org>,
        Rob Clark <robdclark@...il.com>, Sean Paul <sean@...rly.run>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Rajesh Yadav <ryadav@...eaurora.org>,
        Boris Brezillon <bbrezillon@...nel.org>,
        Mamta Shukla <mamtashukla555@...il.com>,
        freedreno@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: [PATCH 5/5] drm/msm/mdp5: Use the interconnect API

From: Georgi Djakov <georgi.djakov@...aro.org>

The interconnect API provides an interface for consumer drivers to
express their bandwidth needs in the SoC. This data is aggregated
and the on-chip interconnect hardware is configured to the most
appropriate power/performance profile.

Use the API to configure the interconnects and request bandwidth
between DDR and the display hardware (MDP port(s) and rotator
downscaler).

v2: update the path names to be consistent with dpu, handle the NULL
    path case, updated commit msg from Georgi.

Signed-off-by: Georgi Djakov <georgi.djakov@...aro.org>
Signed-off-by: Rob Clark <robdclark@...omium.org>
---
 drivers/gpu/drm/msm/disp/mdp5/mdp5_kms.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/drivers/gpu/drm/msm/disp/mdp5/mdp5_kms.c b/drivers/gpu/drm/msm/disp/mdp5/mdp5_kms.c
index 97179bec8902..eeac429acf40 100644
--- a/drivers/gpu/drm/msm/disp/mdp5/mdp5_kms.c
+++ b/drivers/gpu/drm/msm/disp/mdp5/mdp5_kms.c
@@ -16,6 +16,7 @@
  * this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
+#include <linux/interconnect.h>
 #include <linux/of_irq.h>
 
 #include "msm_drv.h"
@@ -1050,6 +1051,19 @@ static const struct component_ops mdp5_ops = {
 
 static int mdp5_dev_probe(struct platform_device *pdev)
 {
+	struct icc_path *path0 = of_icc_get(&pdev->dev, "mdp0-mem");
+	struct icc_path *path1 = of_icc_get(&pdev->dev, "mdp1-mem");
+	struct icc_path *path_rot = of_icc_get(&pdev->dev, "rotator-mem");
+
+	if (IS_ERR_OR_NULL(path0))
+		return PTR_ERR_OR_ZERO(path0);
+	icc_set_bw(path0, 0, MBps_to_icc(6400));
+
+	if (!IS_ERR_OR_NULL(path1))
+		icc_set_bw(path1, 0, MBps_to_icc(6400));
+	if (!IS_ERR_OR_NULL(path_rot))
+		icc_set_bw(path_rot, 0, MBps_to_icc(6400));
+
 	DBG("");
 	return component_add(&pdev->dev, &mdp5_ops);
 }
-- 
2.20.1