| Message ID | 20210709122040.v5.2.I909f5375d930f5d0cc877128e30e2a67078b674c@changeid (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | Refactor MTK MDP driver into core/components | expand |
Hi Eizan, Thank you for your patch. On 9/7/21 4:23, Eizan Miyamoto wrote: > Without this change, the MDP components are not fully integrated into > the runtime power management subsystem, and the MDP driver does not > work. > > For each of the component device drivers to be able to call > pm_runtime_get/put_sync() a pointer to the component's device struct > had to be added to struct mtk_mdp_comp, set by mtk_mdp_comp_init(). > > Note that the dev argument to mtk_mdp_comp_clock_on/off() has been > removed. Those functions used to be called from the "master" mdp driver > in mtk_mdp_core.c, but the component's device pointer no longer > corresponds to the mdp master device pointer, which is not the right > device to pass to pm_runtime_put/get_sync() which we had to add to get > the driver to work properly. > > Signed-off-by: Eizan Miyamoto <eizan@chromium.org> > --- > > (no changes since v1) > > drivers/media/platform/mtk-mdp/mtk_mdp_comp.c | 20 ++++++++++++++----- > drivers/media/platform/mtk-mdp/mtk_mdp_comp.h | 8 +++++--- > drivers/media/platform/mtk-mdp/mtk_mdp_core.c | 6 ++---- > 3 files changed, 22 insertions(+), 12 deletions(-) > > diff --git a/drivers/media/platform/mtk-mdp/mtk_mdp_comp.c b/drivers/media/platform/mtk-mdp/mtk_mdp_comp.c > index aec1cb5c4261..8b6158379f41 100644 > --- a/drivers/media/platform/mtk-mdp/mtk_mdp_comp.c > +++ b/drivers/media/platform/mtk-mdp/mtk_mdp_comp.c > @@ -14,6 +14,7 @@ > #include <linux/of_irq.h> > #include <linux/of_platform.h> > #include <soc/mediatek/smi.h> > +#include <linux/pm_runtime.h> > > #include "mtk_mdp_comp.h" > #include "mtk_mdp_core.h" > @@ -52,7 +53,7 @@ static const struct of_device_id mtk_mdp_comp_driver_dt_match[] = { > }; > MODULE_DEVICE_TABLE(of, mtk_mdp_comp_driver_dt_match); > > -void mtk_mdp_comp_clock_on(struct device *dev, struct mtk_mdp_comp *comp) > +void mtk_mdp_comp_clock_on(struct mtk_mdp_comp *comp) > { > int i, err; > > @@ -63,18 +64,22 @@ void mtk_mdp_comp_clock_on(struct device *dev, struct mtk_mdp_comp *comp) > "failed to get larb, err %d.\n", err); > } > > + err = pm_runtime_get_sync(comp->dev); > + if (err < 0) The pm_runtime_get_sync increases the device usage counter so, if it fails you should decrease the usage with put. Ok I see that put is called in off. I don't really like how the error handling of all this is done, but also I think is not your problem, it was also a problem before this patch. > + dev_err(comp->dev, > + "failed to runtime get, err %d.\n", > + err); > + Printing errors and not returning errors is bad design for me. But this is a void function, so ... > for (i = 0; i < ARRAY_SIZE(comp->clk); i++) { > if (IS_ERR(comp->clk[i])) > continue; > err = clk_prepare_enable(comp->clk[i]); > if (err) > - dev_err(dev, > - "failed to enable clock, err %d. i:%d\n", > - err, i); > + dev_err(comp->dev, "failed to enable clock, err %d. i:%d\n", err, i); I think that if clock fails to be enabled it will already print an error, so this print is duplicated. > } > } > > -void mtk_mdp_comp_clock_off(struct device *dev, struct mtk_mdp_comp *comp) > +void mtk_mdp_comp_clock_off(struct mtk_mdp_comp *comp) > { > int i; > > @@ -86,6 +91,8 @@ void mtk_mdp_comp_clock_off(struct device *dev, struct mtk_mdp_comp *comp) > > if (comp->larb_dev) > mtk_smi_larb_put(comp->larb_dev); > + > + pm_runtime_put_sync(comp->dev); > } > > static int mtk_mdp_comp_bind(struct device *dev, struct device *master, > @@ -95,6 +102,7 @@ static int mtk_mdp_comp_bind(struct device *dev, struct device *master, > struct mtk_mdp_dev *mdp = data; > > mtk_mdp_register_component(mdp, comp); > + pm_runtime_enable(dev); > > return 0; > } > @@ -105,6 +113,7 @@ static void mtk_mdp_comp_unbind(struct device *dev, struct device *master, > struct mtk_mdp_dev *mdp = data; > struct mtk_mdp_comp *comp = dev_get_drvdata(dev); > > + pm_runtime_disable(dev); > mtk_mdp_unregister_component(mdp, comp); > } > > @@ -124,6 +133,7 @@ int mtk_mdp_comp_init(struct mtk_mdp_comp *comp, struct device *dev) > (enum mtk_mdp_comp_type)of_device_get_match_data(dev); > > INIT_LIST_HEAD(&comp->node); > + comp->dev = dev; > > for (i = 0; i < ARRAY_SIZE(comp->clk); i++) { > comp->clk[i] = of_clk_get(node, i); > diff --git a/drivers/media/platform/mtk-mdp/mtk_mdp_comp.h b/drivers/media/platform/mtk-mdp/mtk_mdp_comp.h > index b5a18fe567aa..5e2ee94a1b37 100644 > --- a/drivers/media/platform/mtk-mdp/mtk_mdp_comp.h > +++ b/drivers/media/platform/mtk-mdp/mtk_mdp_comp.h > @@ -12,17 +12,19 @@ > * @node: list node to track sibing MDP components > * @clk: clocks required for component > * @larb_dev: SMI device required for component > + * @dev: component's device > */ > struct mtk_mdp_comp { > struct list_head node; > struct clk *clk[2]; > - struct device *larb_dev; > + struct device *larb_dev; This change is unrelated to this patch. > + struct device *dev; > }; > > int mtk_mdp_comp_init(struct mtk_mdp_comp *comp, struct device *dev); > > -void mtk_mdp_comp_clock_on(struct device *dev, struct mtk_mdp_comp *comp); > -void mtk_mdp_comp_clock_off(struct device *dev, struct mtk_mdp_comp *comp); > +void mtk_mdp_comp_clock_on(struct mtk_mdp_comp *comp); > +void mtk_mdp_comp_clock_off(struct mtk_mdp_comp *comp); > > extern struct platform_driver mtk_mdp_component_driver; > > diff --git a/drivers/media/platform/mtk-mdp/mtk_mdp_core.c b/drivers/media/platform/mtk-mdp/mtk_mdp_core.c > index aca236dbd348..78c40a61df1d 100644 > --- a/drivers/media/platform/mtk-mdp/mtk_mdp_core.c > +++ b/drivers/media/platform/mtk-mdp/mtk_mdp_core.c > @@ -52,20 +52,18 @@ MODULE_DEVICE_TABLE(of, mtk_mdp_of_ids); > > static void mtk_mdp_clock_on(struct mtk_mdp_dev *mdp) > { > - struct device *dev = &mdp->pdev->dev; > struct mtk_mdp_comp *comp_node; > > list_for_each_entry(comp_node, &mdp->comp_list, node) > - mtk_mdp_comp_clock_on(dev, comp_node); > + mtk_mdp_comp_clock_on(comp_node); > } > > static void mtk_mdp_clock_off(struct mtk_mdp_dev *mdp) > { > - struct device *dev = &mdp->pdev->dev; > struct mtk_mdp_comp *comp_node; > > list_for_each_entry(comp_node, &mdp->comp_list, node) > - mtk_mdp_comp_clock_off(dev, comp_node); > + mtk_mdp_comp_clock_off(comp_node); > } > > static void mtk_mdp_wdt_worker(struct work_struct *work) >
diff --git a/drivers/media/platform/mtk-mdp/mtk_mdp_comp.c b/drivers/media/platform/mtk-mdp/mtk_mdp_comp.c index aec1cb5c4261..8b6158379f41 100644 --- a/drivers/media/platform/mtk-mdp/mtk_mdp_comp.c +++ b/drivers/media/platform/mtk-mdp/mtk_mdp_comp.c @@ -14,6 +14,7 @@ #include <linux/of_irq.h> #include <linux/of_platform.h> #include <soc/mediatek/smi.h> +#include <linux/pm_runtime.h> #include "mtk_mdp_comp.h" #include "mtk_mdp_core.h" @@ -52,7 +53,7 @@ static const struct of_device_id mtk_mdp_comp_driver_dt_match[] = { }; MODULE_DEVICE_TABLE(of, mtk_mdp_comp_driver_dt_match); -void mtk_mdp_comp_clock_on(struct device *dev, struct mtk_mdp_comp *comp) +void mtk_mdp_comp_clock_on(struct mtk_mdp_comp *comp) { int i, err; @@ -63,18 +64,22 @@ void mtk_mdp_comp_clock_on(struct device *dev, struct mtk_mdp_comp *comp) "failed to get larb, err %d.\n", err); } + err = pm_runtime_get_sync(comp->dev); + if (err < 0) + dev_err(comp->dev, + "failed to runtime get, err %d.\n", + err); + for (i = 0; i < ARRAY_SIZE(comp->clk); i++) { if (IS_ERR(comp->clk[i])) continue; err = clk_prepare_enable(comp->clk[i]); if (err) - dev_err(dev, - "failed to enable clock, err %d. i:%d\n", - err, i); + dev_err(comp->dev, "failed to enable clock, err %d. i:%d\n", err, i); } } -void mtk_mdp_comp_clock_off(struct device *dev, struct mtk_mdp_comp *comp) +void mtk_mdp_comp_clock_off(struct mtk_mdp_comp *comp) { int i; @@ -86,6 +91,8 @@ void mtk_mdp_comp_clock_off(struct device *dev, struct mtk_mdp_comp *comp) if (comp->larb_dev) mtk_smi_larb_put(comp->larb_dev); + + pm_runtime_put_sync(comp->dev); } static int mtk_mdp_comp_bind(struct device *dev, struct device *master, @@ -95,6 +102,7 @@ static int mtk_mdp_comp_bind(struct device *dev, struct device *master, struct mtk_mdp_dev *mdp = data; mtk_mdp_register_component(mdp, comp); + pm_runtime_enable(dev); return 0; } @@ -105,6 +113,7 @@ static void mtk_mdp_comp_unbind(struct device *dev, struct device *master, struct mtk_mdp_dev *mdp = data; struct mtk_mdp_comp *comp = dev_get_drvdata(dev); + pm_runtime_disable(dev); mtk_mdp_unregister_component(mdp, comp); } @@ -124,6 +133,7 @@ int mtk_mdp_comp_init(struct mtk_mdp_comp *comp, struct device *dev) (enum mtk_mdp_comp_type)of_device_get_match_data(dev); INIT_LIST_HEAD(&comp->node); + comp->dev = dev; for (i = 0; i < ARRAY_SIZE(comp->clk); i++) { comp->clk[i] = of_clk_get(node, i); diff --git a/drivers/media/platform/mtk-mdp/mtk_mdp_comp.h b/drivers/media/platform/mtk-mdp/mtk_mdp_comp.h index b5a18fe567aa..5e2ee94a1b37 100644 --- a/drivers/media/platform/mtk-mdp/mtk_mdp_comp.h +++ b/drivers/media/platform/mtk-mdp/mtk_mdp_comp.h @@ -12,17 +12,19 @@ * @node: list node to track sibing MDP components * @clk: clocks required for component * @larb_dev: SMI device required for component + * @dev: component's device */ struct mtk_mdp_comp { struct list_head node; struct clk *clk[2]; - struct device *larb_dev; + struct device *larb_dev; + struct device *dev; }; int mtk_mdp_comp_init(struct mtk_mdp_comp *comp, struct device *dev); -void mtk_mdp_comp_clock_on(struct device *dev, struct mtk_mdp_comp *comp); -void mtk_mdp_comp_clock_off(struct device *dev, struct mtk_mdp_comp *comp); +void mtk_mdp_comp_clock_on(struct mtk_mdp_comp *comp); +void mtk_mdp_comp_clock_off(struct mtk_mdp_comp *comp); extern struct platform_driver mtk_mdp_component_driver; diff --git a/drivers/media/platform/mtk-mdp/mtk_mdp_core.c b/drivers/media/platform/mtk-mdp/mtk_mdp_core.c index aca236dbd348..78c40a61df1d 100644 --- a/drivers/media/platform/mtk-mdp/mtk_mdp_core.c +++ b/drivers/media/platform/mtk-mdp/mtk_mdp_core.c @@ -52,20 +52,18 @@ MODULE_DEVICE_TABLE(of, mtk_mdp_of_ids); static void mtk_mdp_clock_on(struct mtk_mdp_dev *mdp) { - struct device *dev = &mdp->pdev->dev; struct mtk_mdp_comp *comp_node; list_for_each_entry(comp_node, &mdp->comp_list, node) - mtk_mdp_comp_clock_on(dev, comp_node); + mtk_mdp_comp_clock_on(comp_node); } static void mtk_mdp_clock_off(struct mtk_mdp_dev *mdp) { - struct device *dev = &mdp->pdev->dev; struct mtk_mdp_comp *comp_node; list_for_each_entry(comp_node, &mdp->comp_list, node) - mtk_mdp_comp_clock_off(dev, comp_node); + mtk_mdp_comp_clock_off(comp_node); } static void mtk_mdp_wdt_worker(struct work_struct *work)
Without this change, the MDP components are not fully integrated into the runtime power management subsystem, and the MDP driver does not work. For each of the component device drivers to be able to call pm_runtime_get/put_sync() a pointer to the component's device struct had to be added to struct mtk_mdp_comp, set by mtk_mdp_comp_init(). Note that the dev argument to mtk_mdp_comp_clock_on/off() has been removed. Those functions used to be called from the "master" mdp driver in mtk_mdp_core.c, but the component's device pointer no longer corresponds to the mdp master device pointer, which is not the right device to pass to pm_runtime_put/get_sync() which we had to add to get the driver to work properly. Signed-off-by: Eizan Miyamoto <eizan@chromium.org> --- (no changes since v1) drivers/media/platform/mtk-mdp/mtk_mdp_comp.c | 20 ++++++++++++++----- drivers/media/platform/mtk-mdp/mtk_mdp_comp.h | 8 +++++--- drivers/media/platform/mtk-mdp/mtk_mdp_core.c | 6 ++---- 3 files changed, 22 insertions(+), 12 deletions(-)