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

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Il 19/09/23 12:21, Chen-Yu Tsai ha scritto:
On Tue, Sep 19, 2023 at 6:00 PM AngeloGioacchino Del Regno
<angelogioacchino.delregno@xxxxxxxxxxxxx> wrote:

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.

Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@xxxxxxxxxxxxx>
---
  .../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 8677e7fd5083..d93d3833633e 100644
--- a/drivers/media/platform/mediatek/mdp3/mtk-mdp3-core.c
+++ b/drivers/media/platform/mediatek/mdp3/mtk-mdp3-core.c
@@ -254,13 +254,17 @@ static int mdp_probe(struct platform_device *pdev)
                 goto err_destroy_job_wq;
         }

-       mm_pdev = __get_pdev_by_id(pdev, NULL, 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, NULL, 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);

You need to keep the original code as a fallback for old device trees.


I haven't removed the original code, it *is* there as a fallback :-)

mdp->scp = scp_get() <--- new
if (!mdp->scp) { fallback }

Regards,
Angelo

ChenYu

         }
-       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

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