linux-kernel - [PATCH v2 2/2] media: platform: mtk-mdp3: Use devicetree phandle to retrieve SCP

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Date:   Thu,  5 Oct 2023 12:49:05 +0200
From:   AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>
To:     mchehab@...nel.org
Cc:     robh+dt@...nel.org, krzysztof.kozlowski+dt@...aro.org,
        conor+dt@...nel.org, matthias.bgg@...il.com,
        angelogioacchino.delregno@...labora.com, moudy.ho@...iatek.com,
        hverkuil-cisco@...all.nl, sakari.ailus@...ux.intel.com,
        u.kleine-koenig@...gutronix.de, linqiheng@...wei.com,
        linux-media@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, kernel@...labora.com,
        wenst@...omium.org
Subject: [PATCH v2 2/2] media: platform: mtk-mdp3: Use devicetree phandle to retrieve SCP

Instead of walking the entire parent node for something that has the
right compatible, use the scp_get() function provided by the MediaTek
SCP remoteproc driver to retrieve a handle to mtk_scp through the
devicetree "mediatek,scp" (phandle) property.

In case of multi-core SCP, this also allows to select a specific core.

Reviewed-by: Chen-Yu Tsai <wenst@...omium.org>
Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
---
 .../media/platform/mediatek/mdp3/mtk-mdp3-core.c | 16 ++++++++++------
 1 file changed, 10 insertions(+), 6 deletions(-)

diff --git a/drivers/media/platform/mediatek/mdp3/mtk-mdp3-core.c b/drivers/media/platform/mediatek/mdp3/mtk-mdp3-core.c
index cc44be10fdb7..94f4ed78523b 100644
--- a/drivers/media/platform/mediatek/mdp3/mtk-mdp3-core.c
+++ b/drivers/media/platform/mediatek/mdp3/mtk-mdp3-core.c
@@ -208,13 +208,17 @@ static int mdp_probe(struct platform_device *pdev)
 		goto err_destroy_job_wq;
 	}
 
-	mm_pdev = __get_pdev_by_id(pdev, MDP_INFRA_SCP);
-	if (WARN_ON(!mm_pdev)) {
-		dev_err(&pdev->dev, "Could not get scp device\n");
-		ret = -ENODEV;
-		goto err_destroy_clock_wq;
+	mdp->scp = scp_get(pdev);
+	if (!mdp->scp) {
+		mm_pdev = __get_pdev_by_id(pdev, MDP_INFRA_SCP);
+		if (WARN_ON(!mm_pdev)) {
+			dev_err(&pdev->dev, "Could not get scp device\n");
+			ret = -ENODEV;
+			goto err_destroy_clock_wq;
+		}
+		mdp->scp = platform_get_drvdata(mm_pdev);
 	}
-	mdp->scp = platform_get_drvdata(mm_pdev);
+
 	mdp->rproc_handle = scp_get_rproc(mdp->scp);
 	dev_dbg(&pdev->dev, "MDP rproc_handle: %pK", mdp->rproc_handle);
 
-- 
2.42.0