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Message-Id: <20220607165011.148795471@linuxfoundation.org>
Date: Tue, 7 Jun 2022 18:56:44 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-kernel@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
stable@...r.kernel.org, Rex-BC Chen <rex-bc.chen@...iatek.com>,
"jason-jh.lin" <jason-jh.lin@...iatek.com>,
Chun-Kuang Hu <chunkuang.hu@...nel.org>,
Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.18 286/879] drm/mediatek: Add vblank register/unregister callback functions
From: Rex-BC Chen <rex-bc.chen@...iatek.com>
[ Upstream commit b74d921b900b6ce38c6247c0a1c86be9f3746493 ]
We encountered a kernel panic issue that callback data will be NULL when
it's using in ovl irq handler. There is a timing issue between
mtk_disp_ovl_irq_handler() and mtk_ovl_disable_vblank().
To resolve this issue, we use the flow to register/unregister vblank cb:
- Register callback function and callback data when crtc creates.
- Unregister callback function and callback data when crtc destroies.
With this solution, we can assure callback data will not be NULL when
vblank is disable.
Link: https://patchwork.kernel.org/project/linux-mediatek/patch/20220321072320.15019-1-rex-bc.chen@mediatek.com/
Fixes: 9b0704988b15 ("drm/mediatek: Register vblank callback function")
Signed-off-by: Rex-BC Chen <rex-bc.chen@...iatek.com>
Reviewed-by: jason-jh.lin <jason-jh.lin@...iatek.com>
Signed-off-by: Chun-Kuang Hu <chunkuang.hu@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
drivers/gpu/drm/mediatek/mtk_disp_drv.h | 16 +++++++-----
drivers/gpu/drm/mediatek/mtk_disp_ovl.c | 22 ++++++++++++----
drivers/gpu/drm/mediatek/mtk_disp_rdma.c | 20 +++++++++-----
drivers/gpu/drm/mediatek/mtk_drm_crtc.c | 14 +++++++++-
drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c | 4 +++
drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.h | 29 ++++++++++++++++-----
6 files changed, 80 insertions(+), 25 deletions(-)
diff --git a/drivers/gpu/drm/mediatek/mtk_disp_drv.h b/drivers/gpu/drm/mediatek/mtk_disp_drv.h
index 86c3068894b1..974462831133 100644
--- a/drivers/gpu/drm/mediatek/mtk_disp_drv.h
+++ b/drivers/gpu/drm/mediatek/mtk_disp_drv.h
@@ -76,9 +76,11 @@ void mtk_ovl_layer_off(struct device *dev, unsigned int idx,
void mtk_ovl_start(struct device *dev);
void mtk_ovl_stop(struct device *dev);
unsigned int mtk_ovl_supported_rotations(struct device *dev);
-void mtk_ovl_enable_vblank(struct device *dev,
- void (*vblank_cb)(void *),
- void *vblank_cb_data);
+void mtk_ovl_register_vblank_cb(struct device *dev,
+ void (*vblank_cb)(void *),
+ void *vblank_cb_data);
+void mtk_ovl_unregister_vblank_cb(struct device *dev);
+void mtk_ovl_enable_vblank(struct device *dev);
void mtk_ovl_disable_vblank(struct device *dev);
void mtk_rdma_bypass_shadow(struct device *dev);
@@ -93,9 +95,11 @@ void mtk_rdma_layer_config(struct device *dev, unsigned int idx,
struct cmdq_pkt *cmdq_pkt);
void mtk_rdma_start(struct device *dev);
void mtk_rdma_stop(struct device *dev);
-void mtk_rdma_enable_vblank(struct device *dev,
- void (*vblank_cb)(void *),
- void *vblank_cb_data);
+void mtk_rdma_register_vblank_cb(struct device *dev,
+ void (*vblank_cb)(void *),
+ void *vblank_cb_data);
+void mtk_rdma_unregister_vblank_cb(struct device *dev);
+void mtk_rdma_enable_vblank(struct device *dev);
void mtk_rdma_disable_vblank(struct device *dev);
#endif
diff --git a/drivers/gpu/drm/mediatek/mtk_disp_ovl.c b/drivers/gpu/drm/mediatek/mtk_disp_ovl.c
index 17cd9b932298..70ab22964f3b 100644
--- a/drivers/gpu/drm/mediatek/mtk_disp_ovl.c
+++ b/drivers/gpu/drm/mediatek/mtk_disp_ovl.c
@@ -97,14 +97,28 @@ static irqreturn_t mtk_disp_ovl_irq_handler(int irq, void *dev_id)
return IRQ_HANDLED;
}
-void mtk_ovl_enable_vblank(struct device *dev,
- void (*vblank_cb)(void *),
- void *vblank_cb_data)
+void mtk_ovl_register_vblank_cb(struct device *dev,
+ void (*vblank_cb)(void *),
+ void *vblank_cb_data)
{
struct mtk_disp_ovl *ovl = dev_get_drvdata(dev);
ovl->vblank_cb = vblank_cb;
ovl->vblank_cb_data = vblank_cb_data;
+}
+
+void mtk_ovl_unregister_vblank_cb(struct device *dev)
+{
+ struct mtk_disp_ovl *ovl = dev_get_drvdata(dev);
+
+ ovl->vblank_cb = NULL;
+ ovl->vblank_cb_data = NULL;
+}
+
+void mtk_ovl_enable_vblank(struct device *dev)
+{
+ struct mtk_disp_ovl *ovl = dev_get_drvdata(dev);
+
writel(0x0, ovl->regs + DISP_REG_OVL_INTSTA);
writel_relaxed(OVL_FME_CPL_INT, ovl->regs + DISP_REG_OVL_INTEN);
}
@@ -113,8 +127,6 @@ void mtk_ovl_disable_vblank(struct device *dev)
{
struct mtk_disp_ovl *ovl = dev_get_drvdata(dev);
- ovl->vblank_cb = NULL;
- ovl->vblank_cb_data = NULL;
writel_relaxed(0x0, ovl->regs + DISP_REG_OVL_INTEN);
}
diff --git a/drivers/gpu/drm/mediatek/mtk_disp_rdma.c b/drivers/gpu/drm/mediatek/mtk_disp_rdma.c
index 662e91d9d45f..1be4caf9ff96 100644
--- a/drivers/gpu/drm/mediatek/mtk_disp_rdma.c
+++ b/drivers/gpu/drm/mediatek/mtk_disp_rdma.c
@@ -95,24 +95,32 @@ static void rdma_update_bits(struct device *dev, unsigned int reg,
writel(tmp, rdma->regs + reg);
}
-void mtk_rdma_enable_vblank(struct device *dev,
- void (*vblank_cb)(void *),
- void *vblank_cb_data)
+void mtk_rdma_register_vblank_cb(struct device *dev,
+ void (*vblank_cb)(void *),
+ void *vblank_cb_data)
{
struct mtk_disp_rdma *rdma = dev_get_drvdata(dev);
rdma->vblank_cb = vblank_cb;
rdma->vblank_cb_data = vblank_cb_data;
- rdma_update_bits(dev, DISP_REG_RDMA_INT_ENABLE, RDMA_FRAME_END_INT,
- RDMA_FRAME_END_INT);
}
-void mtk_rdma_disable_vblank(struct device *dev)
+void mtk_rdma_unregister_vblank_cb(struct device *dev)
{
struct mtk_disp_rdma *rdma = dev_get_drvdata(dev);
rdma->vblank_cb = NULL;
rdma->vblank_cb_data = NULL;
+}
+
+void mtk_rdma_enable_vblank(struct device *dev)
+{
+ rdma_update_bits(dev, DISP_REG_RDMA_INT_ENABLE, RDMA_FRAME_END_INT,
+ RDMA_FRAME_END_INT);
+}
+
+void mtk_rdma_disable_vblank(struct device *dev)
+{
rdma_update_bits(dev, DISP_REG_RDMA_INT_ENABLE, RDMA_FRAME_END_INT, 0);
}
diff --git a/drivers/gpu/drm/mediatek/mtk_drm_crtc.c b/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
index ede435d2c1ef..f24b21eb03cd 100644
--- a/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
+++ b/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
@@ -152,6 +152,7 @@ static void mtk_drm_cmdq_pkt_destroy(struct cmdq_pkt *pkt)
static void mtk_drm_crtc_destroy(struct drm_crtc *crtc)
{
struct mtk_drm_crtc *mtk_crtc = to_mtk_crtc(crtc);
+ int i;
mtk_mutex_put(mtk_crtc->mutex);
#if IS_REACHABLE(CONFIG_MTK_CMDQ)
@@ -162,6 +163,14 @@ static void mtk_drm_crtc_destroy(struct drm_crtc *crtc)
mtk_crtc->cmdq_client.chan = NULL;
}
#endif
+
+ for (i = 0; i < mtk_crtc->ddp_comp_nr; i++) {
+ struct mtk_ddp_comp *comp;
+
+ comp = mtk_crtc->ddp_comp[i];
+ mtk_ddp_comp_unregister_vblank_cb(comp);
+ }
+
drm_crtc_cleanup(crtc);
}
@@ -617,7 +626,7 @@ static int mtk_drm_crtc_enable_vblank(struct drm_crtc *crtc)
struct mtk_drm_crtc *mtk_crtc = to_mtk_crtc(crtc);
struct mtk_ddp_comp *comp = mtk_crtc->ddp_comp[0];
- mtk_ddp_comp_enable_vblank(comp, mtk_crtc_ddp_irq, &mtk_crtc->base);
+ mtk_ddp_comp_enable_vblank(comp);
return 0;
}
@@ -926,6 +935,9 @@ int mtk_drm_crtc_create(struct drm_device *drm_dev,
if (comp->funcs->ctm_set)
has_ctm = true;
}
+
+ mtk_ddp_comp_register_vblank_cb(comp, mtk_crtc_ddp_irq,
+ &mtk_crtc->base);
}
for (i = 0; i < mtk_crtc->ddp_comp_nr; i++)
diff --git a/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c b/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c
index 2e99aee13dfe..5d7504a72b11 100644
--- a/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c
+++ b/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c
@@ -297,6 +297,8 @@ static const struct mtk_ddp_comp_funcs ddp_ovl = {
.config = mtk_ovl_config,
.start = mtk_ovl_start,
.stop = mtk_ovl_stop,
+ .register_vblank_cb = mtk_ovl_register_vblank_cb,
+ .unregister_vblank_cb = mtk_ovl_unregister_vblank_cb,
.enable_vblank = mtk_ovl_enable_vblank,
.disable_vblank = mtk_ovl_disable_vblank,
.supported_rotations = mtk_ovl_supported_rotations,
@@ -321,6 +323,8 @@ static const struct mtk_ddp_comp_funcs ddp_rdma = {
.config = mtk_rdma_config,
.start = mtk_rdma_start,
.stop = mtk_rdma_stop,
+ .register_vblank_cb = mtk_rdma_register_vblank_cb,
+ .unregister_vblank_cb = mtk_rdma_unregister_vblank_cb,
.enable_vblank = mtk_rdma_enable_vblank,
.disable_vblank = mtk_rdma_disable_vblank,
.layer_nr = mtk_rdma_layer_nr,
diff --git a/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.h b/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.h
index ad267bb8fc9b..1cbc6332282d 100644
--- a/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.h
+++ b/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.h
@@ -48,9 +48,11 @@ struct mtk_ddp_comp_funcs {
unsigned int bpc, struct cmdq_pkt *cmdq_pkt);
void (*start)(struct device *dev);
void (*stop)(struct device *dev);
- void (*enable_vblank)(struct device *dev,
- void (*vblank_cb)(void *),
- void *vblank_cb_data);
+ void (*register_vblank_cb)(struct device *dev,
+ void (*vblank_cb)(void *),
+ void *vblank_cb_data);
+ void (*unregister_vblank_cb)(struct device *dev);
+ void (*enable_vblank)(struct device *dev);
void (*disable_vblank)(struct device *dev);
unsigned int (*supported_rotations)(struct device *dev);
unsigned int (*layer_nr)(struct device *dev);
@@ -110,12 +112,25 @@ static inline void mtk_ddp_comp_stop(struct mtk_ddp_comp *comp)
comp->funcs->stop(comp->dev);
}
-static inline void mtk_ddp_comp_enable_vblank(struct mtk_ddp_comp *comp,
- void (*vblank_cb)(void *),
- void *vblank_cb_data)
+static inline void mtk_ddp_comp_register_vblank_cb(struct mtk_ddp_comp *comp,
+ void (*vblank_cb)(void *),
+ void *vblank_cb_data)
+{
+ if (comp->funcs && comp->funcs->register_vblank_cb)
+ comp->funcs->register_vblank_cb(comp->dev, vblank_cb,
+ vblank_cb_data);
+}
+
+static inline void mtk_ddp_comp_unregister_vblank_cb(struct mtk_ddp_comp *comp)
+{
+ if (comp->funcs && comp->funcs->unregister_vblank_cb)
+ comp->funcs->unregister_vblank_cb(comp->dev);
+}
+
+static inline void mtk_ddp_comp_enable_vblank(struct mtk_ddp_comp *comp)
{
if (comp->funcs && comp->funcs->enable_vblank)
- comp->funcs->enable_vblank(comp->dev, vblank_cb, vblank_cb_data);
+ comp->funcs->enable_vblank(comp->dev);
}
static inline void mtk_ddp_comp_disable_vblank(struct mtk_ddp_comp *comp)
--
2.35.1
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