[PATCH v2 4/5] drm/mediatek: Automatically search unclaimed mtk mutex in mtk_mutex_get()
From: Chun-Kuang Hu <chunkuang.hu@kernel.org>
Date: 2021-01-06 23:18:33
Also in:
dri-devel, linux-mediatek, lkml
Subsystem:
drm drivers, drm drivers for mediatek, the rest · Maintainers:
David Airlie, Simona Vetter, Chun-Kuang Hu, Philipp Zabel, Linus Torvalds
From: CK Hu <redacted> Moving mutex resource management from client driver to mutex driver could prevent client drivers negotiating for resource management. Signed-off-by: CK Hu <redacted> Signed-off-by: Chun-Kuang Hu <chunkuang.hu@kernel.org> --- drivers/gpu/drm/mediatek/mtk_drm_crtc.c | 2 +- drivers/gpu/drm/mediatek/mtk_mutex.c | 16 ++++++++-------- drivers/gpu/drm/mediatek/mtk_mutex.h | 2 +- 3 files changed, 10 insertions(+), 10 deletions(-)
diff --git a/drivers/gpu/drm/mediatek/mtk_drm_crtc.c b/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
index bba87a036fa8..1e3a9450680b 100644
--- a/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
+++ b/drivers/gpu/drm/mediatek/mtk_drm_crtc.c@@ -773,7 +773,7 @@ int mtk_drm_crtc_create(struct drm_device *drm_dev, if (!mtk_crtc->ddp_comp) return -ENOMEM; - mtk_crtc->mutex = mtk_mutex_get(priv->mutex_dev, pipe); + mtk_crtc->mutex = mtk_mutex_get(priv->mutex_dev); if (IS_ERR(mtk_crtc->mutex)) { ret = PTR_ERR(mtk_crtc->mutex); dev_err(dev, "Failed to get mutex: %d\n", ret);
diff --git a/drivers/gpu/drm/mediatek/mtk_mutex.c b/drivers/gpu/drm/mediatek/mtk_mutex.c
index 98a060bf225d..66344759e622 100644
--- a/drivers/gpu/drm/mediatek/mtk_mutex.c
+++ b/drivers/gpu/drm/mediatek/mtk_mutex.c@@ -228,18 +228,18 @@ static const struct mtk_mutex_data mt8173_mutex_driver_data = { .mutex_sof_reg = MT2701_MUTEX0_SOF0, }; -struct mtk_mutex *mtk_mutex_get(struct device *dev, unsigned int id) +struct mtk_mutex *mtk_mutex_get(struct device *dev) { struct mtk_mutex_ctx *mtx = dev_get_drvdata(dev); + int i; - if (id >= 10) - return ERR_PTR(-EINVAL); - if (mtx->mutex[id].claimed) - return ERR_PTR(-EBUSY); - - mtx->mutex[id].claimed = true; + for (i = 0; i < 10; i++) + if (!mtx->mutex[i].claimed) { + mtx->mutex[i].claimed = true; + return &mtx->mutex[i]; + } - return &mtx->mutex[id]; + return ERR_PTR(-EBUSY); } void mtk_mutex_put(struct mtk_mutex *mutex)
diff --git a/drivers/gpu/drm/mediatek/mtk_mutex.h b/drivers/gpu/drm/mediatek/mtk_mutex.h
index b678e0988a37..6fe4ffbde290 100644
--- a/drivers/gpu/drm/mediatek/mtk_mutex.h
+++ b/drivers/gpu/drm/mediatek/mtk_mutex.h@@ -10,7 +10,7 @@ struct regmap; struct device; struct mtk_mutex; -struct mtk_mutex *mtk_mutex_get(struct device *dev, unsigned int id); +struct mtk_mutex *mtk_mutex_get(struct device *dev); int mtk_mutex_prepare(struct mtk_mutex *mutex); void mtk_mutex_add_comp(struct mtk_mutex *mutex, enum mtk_ddp_comp_id id);
--
2.17.1
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