Hi, Hsiao-chien: On Mon, 2023-10-16 at 18:40 +0800, Hsiao Chien Sung wrote: > Different from OVL, OVL adaptor is a pseudo device so we didn't > define it in the device tree, consequently, > pm_runtime_resume_and_get() > called by .atomic_enable() powers on no device in OVL adaptor and > leads to power outage in the corresponding IOMMU. > > To resolve the issue, we implement a function to power on the RDMAs > in OVL adaptor, and the system will make sure the IOMMU is powered on > as well because of the device link (iommus) in the RDMA nodes in DTS. > > Fixes: 5db12f5d843b ("media: drm/mediatek: Add pm runtime support for > ovl and rdma") > > Signed-off-by: Hsiao Chien Sung <shawn.sung@xxxxxxxxxxxx> > --- > drivers/gpu/drm/mediatek/mtk_disp_drv.h | 4 ++ > .../gpu/drm/mediatek/mtk_disp_ovl_adaptor.c | 62 > +++++++++++++++++++ > drivers/gpu/drm/mediatek/mtk_drm_crtc.c | 28 +++------ > drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c | 2 + > drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.h | 20 ++++++ > drivers/gpu/drm/mediatek/mtk_mdp_rdma.c | 16 +++++ > 6 files changed, 111 insertions(+), 21 deletions(-) > > diff --git a/drivers/gpu/drm/mediatek/mtk_disp_drv.h > b/drivers/gpu/drm/mediatek/mtk_disp_drv.h > index e2b602037ac3..c44f5b31bab5 100644 > --- a/drivers/gpu/drm/mediatek/mtk_disp_drv.h > +++ b/drivers/gpu/drm/mediatek/mtk_disp_drv.h > @@ -109,6 +109,8 @@ void mtk_ovl_adaptor_connect(struct device *dev, > struct device *mmsys_dev, > unsigned int next); > void mtk_ovl_adaptor_disconnect(struct device *dev, struct device > *mmsys_dev, > unsigned int next); > +int mtk_ovl_adaptor_power_on(struct device *dev); > +void mtk_ovl_adaptor_power_off(struct device *dev); > int mtk_ovl_adaptor_clk_enable(struct device *dev); > void mtk_ovl_adaptor_clk_disable(struct device *dev); > void mtk_ovl_adaptor_config(struct device *dev, unsigned int w, > @@ -150,6 +152,8 @@ void mtk_rdma_disable_vblank(struct device *dev); > const u32 *mtk_rdma_get_formats(struct device *dev); > size_t mtk_rdma_get_num_formats(struct device *dev); > > +int mtk_mdp_rdma_power_on(struct device *dev); > +void mtk_mdp_rdma_power_off(struct device *dev); > int mtk_mdp_rdma_clk_enable(struct device *dev); > void mtk_mdp_rdma_clk_disable(struct device *dev); > void mtk_mdp_rdma_start(struct device *dev, struct cmdq_pkt > *cmdq_pkt); > diff --git a/drivers/gpu/drm/mediatek/mtk_disp_ovl_adaptor.c > b/drivers/gpu/drm/mediatek/mtk_disp_ovl_adaptor.c > index b80425360e76..8de57a5f5518 100644 > --- a/drivers/gpu/drm/mediatek/mtk_disp_ovl_adaptor.c > +++ b/drivers/gpu/drm/mediatek/mtk_disp_ovl_adaptor.c > @@ -98,6 +98,8 @@ static const struct mtk_ddp_comp_funcs _padding = { > }; > > static const struct mtk_ddp_comp_funcs _rdma = { > + .power_on = mtk_mdp_rdma_power_on, > + .power_off = mtk_mdp_rdma_power_off, > .clk_enable = mtk_mdp_rdma_clk_enable, > .clk_disable = mtk_mdp_rdma_clk_disable, > }; > @@ -241,6 +243,66 @@ void mtk_ovl_adaptor_stop(struct device *dev) > } > } > > +/** > + * mtk_ovl_adaptor_power_on - Power on devices in OVL adaptor > + * @dev: device to be powered on > + * > + * Different from OVL, OVL adaptor is a pseudo device so > + * we didn't define it in the device tree, > pm_runtime_resume_and_get() > + * called by .atomic_enable() power on no device in OVL adaptor, > + * we have to implement a function to do the job instead. > + * > + * returns: > + * zero on success, errno on failures. > + */ > +int mtk_ovl_adaptor_power_on(struct device *dev) > +{ > + int i, ret; > + struct mtk_disp_ovl_adaptor *ovl_adaptor = > dev_get_drvdata(dev); > + > + for (i = 0; i < OVL_ADAPTOR_ID_MAX; i++) { > + if (!ovl_adaptor->ovl_adaptor_comp[i] || > + !comp_matches[i].funcs->power_on) > + continue; To simplify the code, you could call mtk_ddp_comp_power_on() for all sub device, and drop power_on()/power_off() of mdp_rdma. Regards, CK > + > + /* > + * do not power on the devices that don't define > + * .power_off() function > + */ > + if (!comp_matches[i].funcs->power_off) { > + dev_warn(dev, ".power_off() is undefined\n"); > + continue; > + } > + > + ret = comp_matches[i].funcs->power_on(ovl_adaptor- > >ovl_adaptor_comp[i]); > + if (ret < 0) { > + mtk_ovl_adaptor_power_off(dev); > + return ret; > + } > + } > + return 0; > +} > + > +/** > + * mtk_ovl_adaptor_power_off - Power off devices in OVL adaptor > + * @dev: device to be powered off > + * > + * call .power_off() function if defined > + */ > +void mtk_ovl_adaptor_power_off(struct device *dev) > +{ > + int i; > + struct mtk_disp_ovl_adaptor *ovl_adaptor = > dev_get_drvdata(dev); > + > + for (i = 0; i < OVL_ADAPTOR_ID_MAX; i++) { > + if (!ovl_adaptor->ovl_adaptor_comp[i] || > + !comp_matches[i].funcs->power_off) > + continue; > + > + comp_matches[i].funcs->power_off(ovl_adaptor- > >ovl_adaptor_comp[i]); > + } > +} > + > int mtk_ovl_adaptor_clk_enable(struct device *dev) > { > int i; > diff --git a/drivers/gpu/drm/mediatek/mtk_drm_crtc.c > b/drivers/gpu/drm/mediatek/mtk_drm_crtc.c > index a0b2ba3cbcdb..c7edd80be428 100644 > --- a/drivers/gpu/drm/mediatek/mtk_drm_crtc.c > +++ b/drivers/gpu/drm/mediatek/mtk_drm_crtc.c > @@ -6,7 +6,6 @@ > #include <linux/clk.h> > #include <linux/dma-mapping.h> > #include <linux/mailbox_controller.h> > -#include <linux/pm_runtime.h> > #include <linux/soc/mediatek/mtk-cmdq.h> > #include <linux/soc/mediatek/mtk-mmsys.h> > #include <linux/soc/mediatek/mtk-mutex.h> > @@ -362,22 +361,16 @@ static int mtk_crtc_ddp_hw_init(struct > mtk_drm_crtc *mtk_crtc, struct drm_atomic > drm_connector_list_iter_end(&conn_iter); > } > > - ret = pm_runtime_resume_and_get(crtc->dev->dev); > - if (ret < 0) { > - DRM_ERROR("Failed to enable power domain: %d\n", ret); > - return ret; > - } > - > ret = mtk_mutex_prepare(mtk_crtc->mutex); > if (ret < 0) { > DRM_ERROR("Failed to enable mutex clock: %d\n", ret); > - goto err_pm_runtime_put; > + goto error; > } > > ret = mtk_crtc_ddp_clk_enable(mtk_crtc); > if (ret < 0) { > DRM_ERROR("Failed to enable component clocks: %d\n", > ret); > - goto err_mutex_unprepare; > + goto error; > } > > for (i = 0; i < mtk_crtc->ddp_comp_nr - 1; i++) { > @@ -426,16 +419,13 @@ static int mtk_crtc_ddp_hw_init(struct > mtk_drm_crtc *mtk_crtc, struct drm_atomic > > return 0; > > -err_mutex_unprepare: > +error: > mtk_mutex_unprepare(mtk_crtc->mutex); > -err_pm_runtime_put: > - pm_runtime_put(crtc->dev->dev); > return ret; > } > > static void mtk_crtc_ddp_hw_fini(struct mtk_drm_crtc *mtk_crtc) > { > - struct drm_device *drm = mtk_crtc->base.dev; > struct drm_crtc *crtc = &mtk_crtc->base; > int i; > > @@ -465,8 +455,6 @@ static void mtk_crtc_ddp_hw_fini(struct > mtk_drm_crtc *mtk_crtc) > mtk_crtc_ddp_clk_disable(mtk_crtc); > mtk_mutex_unprepare(mtk_crtc->mutex); > > - pm_runtime_put(drm->dev); > - > if (crtc->state->event && !crtc->state->active) { > spin_lock_irq(&crtc->dev->event_lock); > drm_crtc_send_vblank_event(crtc, crtc->state->event); > @@ -774,7 +762,7 @@ static void mtk_drm_crtc_atomic_enable(struct > drm_crtc *crtc, > return; > } > > - ret = pm_runtime_resume_and_get(comp->dev); > + ret = mtk_ddp_comp_power_on(comp); > if (ret < 0) { > DRM_DEV_ERROR(comp->dev, "Failed to enable power > domain: %d\n", ret); > return; > @@ -782,7 +770,7 @@ static void mtk_drm_crtc_atomic_enable(struct > drm_crtc *crtc, > > ret = mtk_crtc_ddp_hw_init(mtk_crtc, state); > if (ret) { > - pm_runtime_put(comp->dev); > + mtk_ddp_comp_power_off(comp); > return; > } > > @@ -795,7 +783,7 @@ static void mtk_drm_crtc_atomic_disable(struct > drm_crtc *crtc, > { > struct mtk_drm_crtc *mtk_crtc = to_mtk_crtc(crtc); > struct mtk_ddp_comp *comp = mtk_crtc->ddp_comp[0]; > - int i, ret; > + int i; > > DRM_DEBUG_DRIVER("%s %d\n", __func__, crtc->base.id); > if (!mtk_crtc->enabled) > @@ -825,9 +813,7 @@ static void mtk_drm_crtc_atomic_disable(struct > drm_crtc *crtc, > > drm_crtc_vblank_off(crtc); > mtk_crtc_ddp_hw_fini(mtk_crtc); > - ret = pm_runtime_put(comp->dev); > - if (ret < 0) > - DRM_DEV_ERROR(comp->dev, "Failed to disable power > domain: %d\n", ret); > + mtk_ddp_comp_power_off(comp); > > mtk_crtc->enabled = false; > } > diff --git a/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c > b/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c > index 10402e07a4a7..9940909c7435 100644 > --- a/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c > +++ b/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c > @@ -396,6 +396,8 @@ static const struct mtk_ddp_comp_funcs ddp_ufoe = > { > }; > > static const struct mtk_ddp_comp_funcs ddp_ovl_adaptor = { > + .power_on = mtk_ovl_adaptor_power_on, > + .power_off = mtk_ovl_adaptor_power_off, > .clk_enable = mtk_ovl_adaptor_clk_enable, > .clk_disable = mtk_ovl_adaptor_clk_disable, > .config = mtk_ovl_adaptor_config, > diff --git a/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.h > b/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.h > index 1c1d670cfe41..2597dd7ac0d2 100644 > --- a/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.h > +++ b/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.h > @@ -7,6 +7,7 @@ > #define MTK_DRM_DDP_COMP_H > > #include <linux/io.h> > +#include <linux/pm_runtime.h> > #include <linux/soc/mediatek/mtk-cmdq.h> > #include <linux/soc/mediatek/mtk-mmsys.h> > #include <linux/soc/mediatek/mtk-mutex.h> > @@ -46,6 +47,8 @@ enum mtk_ddp_comp_type { > struct mtk_ddp_comp; > struct cmdq_pkt; > struct mtk_ddp_comp_funcs { > + int (*power_on)(struct device *dev); > + void (*power_off)(struct device *dev); > int (*clk_enable)(struct device *dev); > void (*clk_disable)(struct device *dev); > void (*config)(struct device *dev, unsigned int w, > @@ -91,6 +94,23 @@ struct mtk_ddp_comp { > int encoder_index; > }; > > +static inline int mtk_ddp_comp_power_on(struct mtk_ddp_comp *comp) > +{ > + if (comp->funcs && comp->funcs->power_on) > + return comp->funcs->power_on(comp->dev); > + else > + return pm_runtime_resume_and_get(comp->dev); > + return 0; > +} > + > +static inline void mtk_ddp_comp_power_off(struct mtk_ddp_comp *comp) > +{ > + if (comp->funcs && comp->funcs->power_off) > + comp->funcs->power_off(comp->dev); > + else > + pm_runtime_put(comp->dev); > +} > + > static inline int mtk_ddp_comp_clk_enable(struct mtk_ddp_comp *comp) > { > if (comp->funcs && comp->funcs->clk_enable) > diff --git a/drivers/gpu/drm/mediatek/mtk_mdp_rdma.c > b/drivers/gpu/drm/mediatek/mtk_mdp_rdma.c > index cb36a961786f..8feeb6dce217 100644 > --- a/drivers/gpu/drm/mediatek/mtk_mdp_rdma.c > +++ b/drivers/gpu/drm/mediatek/mtk_mdp_rdma.c > @@ -243,6 +243,22 @@ size_t mtk_mdp_rdma_get_num_formats(struct > device *dev) > return ARRAY_SIZE(formats); > } > > +int mtk_mdp_rdma_power_on(struct device *dev) > +{ > + int ret = pm_runtime_resume_and_get(dev); > + > + if (ret < 0) { > + dev_err(dev, "Failed to power on: %d\n", ret); > + return ret; > + } > + return 0; > +} > + > +void mtk_mdp_rdma_power_off(struct device *dev) > +{ > + pm_runtime_put(dev); > +} > + > int mtk_mdp_rdma_clk_enable(struct device *dev) > { > struct mtk_mdp_rdma *rdma = dev_get_drvdata(dev);