Re: [PATCH v5 6/8] media: mtk-mdp: propagate errors better in pm_suspend/resume
From: Enric Balletbo i Serra <hidden>
Date: 2021-07-12 10:13:09
Also in:
linux-media, linux-mediatek, lkml
Hi Eizan, Thank you for your patch. On 9/7/21 4:23, Eizan Miyamoto wrote:
Up until this change, many errors were logged but ignored when powering on clocks and calling pm_runtime_get/put() inside mtk_mdp_core. This change tries to do a better job at propagating errors back to the power management framework.
Yeah, that's nice. I commented that i dislike the error handling and seems that you're fixing part of it here. It was a bit difficult to review the patches because this back and forth, some problems introduced by previous patches where fixed later. If possible I'd reorganize a bit the patches, even squash some of the pm changes. Basically move this patch before, and do it together with the other pm patches (even try to squash if possible).
quoted hunk ↗ jump to hunk
Signed-off-by: Eizan Miyamoto <redacted> --- (no changes since v1) drivers/media/platform/mtk-mdp/mtk_mdp_comp.c | 62 ++++++++++++++++--- drivers/media/platform/mtk-mdp/mtk_mdp_comp.h | 6 +- drivers/media/platform/mtk-mdp/mtk_mdp_core.c | 57 +++++++++++++---- 3 files changed, 99 insertions(+), 26 deletions(-)diff --git a/drivers/media/platform/mtk-mdp/mtk_mdp_comp.c b/drivers/media/platform/mtk-mdp/mtk_mdp_comp.c index 8a9267d0da1e..87e3f72ff02b 100644 --- a/drivers/media/platform/mtk-mdp/mtk_mdp_comp.c +++ b/drivers/media/platform/mtk-mdp/mtk_mdp_comp.c@@ -53,9 +53,9 @@ 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_power_on(struct mtk_mdp_comp *comp) +int mtk_mdp_comp_power_on(struct mtk_mdp_comp *comp) { - int err; + int status, err; if (comp->larb_dev) { err = mtk_smi_larb_get(comp->larb_dev);@@ -65,34 +65,76 @@ void mtk_mdp_comp_power_on(struct mtk_mdp_comp *comp) } err = pm_runtime_get_sync(comp->dev); - if (err < 0) + if (err < 0) { dev_err(comp->dev, "failed to runtime get, err %d.\n", err); + return err; + } + + err = mtk_mdp_comp_clock_on(comp); + if (err) { + dev_err(comp->dev, "failed to turn on clock. err=%d", err); + status = err; + goto err_mtk_mdp_comp_clock_on; + } + + return err; + +err_mtk_mdp_comp_clock_on: + err = pm_runtime_put_sync(comp->dev); + if (err) + dev_err(comp->dev, "failed to runtime put in cleanup. err=%d", err); - mtk_mdp_comp_clock_on(comp); + return status; } -void mtk_mdp_comp_power_off(struct mtk_mdp_comp *comp) +int mtk_mdp_comp_power_off(struct mtk_mdp_comp *comp) { - int err; + int status, err; mtk_mdp_comp_clock_off(comp); err = pm_runtime_put_sync(comp->dev); - if (err < 0) + if (err < 0) { dev_err(comp->dev, "failed to runtime put, err %d.\n", err); + status = err; + goto err_pm_runtime_put_sync; + } + + return 0; + +err_pm_runtime_put_sync: + err = mtk_mdp_comp_clock_on(comp); + if (err) + dev_err(comp->dev, "failed to turn on clock in cleanup. err=%d", err); + + return status; } -void mtk_mdp_comp_clock_on(struct mtk_mdp_comp *comp) +int mtk_mdp_comp_clock_on(struct mtk_mdp_comp *comp) { - int i, err; + int i, err, status; 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) + if (err) { + status = err; dev_err(comp->dev, "failed to enable clock, err %d. i:%d\n", err, i); + goto err_clk_prepare_enable; + } + } + + return 0; + +err_clk_prepare_enable: + for (--i; i >= 0; i--) { + if (IS_ERR(comp->clk[i])) + continue; + clk_disable_unprepare(comp->clk[i]); } + + return status; } void mtk_mdp_comp_clock_off(struct mtk_mdp_comp *comp)diff --git a/drivers/media/platform/mtk-mdp/mtk_mdp_comp.h b/drivers/media/platform/mtk-mdp/mtk_mdp_comp.h index 15ef9539a5a7..5201c47f7baa 100644 --- a/drivers/media/platform/mtk-mdp/mtk_mdp_comp.h +++ b/drivers/media/platform/mtk-mdp/mtk_mdp_comp.h@@ -23,10 +23,10 @@ struct mtk_mdp_comp { int mtk_mdp_comp_init(struct mtk_mdp_comp *comp, struct device *dev); -void mtk_mdp_comp_power_on(struct mtk_mdp_comp *comp); -void mtk_mdp_comp_power_off(struct mtk_mdp_comp *comp); +int mtk_mdp_comp_power_on(struct mtk_mdp_comp *comp); +int mtk_mdp_comp_power_off(struct mtk_mdp_comp *comp); -void mtk_mdp_comp_clock_on(struct mtk_mdp_comp *comp); +int 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 74ef37eb50bd..b45d588d2659 100644 --- a/drivers/media/platform/mtk-mdp/mtk_mdp_core.c +++ b/drivers/media/platform/mtk-mdp/mtk_mdp_core.c@@ -50,8 +50,9 @@ static const struct of_device_id mtk_mdp_of_ids[] = { }; MODULE_DEVICE_TABLE(of, mtk_mdp_of_ids); -static void mtk_mdp_clock_on(struct mtk_mdp_dev *mdp) +static int mtk_mdp_clock_on(struct mtk_mdp_dev *mdp) { + int err, status; struct mtk_mdp_comp *comp_node; /*@@ -59,18 +60,41 @@ static void mtk_mdp_clock_on(struct mtk_mdp_dev *mdp) * on it through mtk_mdp_m2m_start_streaming, making it unnecessary to * have mtk_mdp_comp_power_on called on it. */ - mtk_mdp_comp_clock_on(&mdp->comp_self); + err = mtk_mdp_comp_clock_on(&mdp->comp_self); + if (err) + return err; + + list_for_each_entry(comp_node, &mdp->comp_list, node) { + err = mtk_mdp_comp_power_on(comp_node); + if (err) { + status = err; + goto err_mtk_mdp_comp_power_on; + } + } - list_for_each_entry(comp_node, &mdp->comp_list, node) - mtk_mdp_comp_power_on(comp_node); + return 0; + +err_mtk_mdp_comp_power_on: + list_for_each_entry_continue_reverse(comp_node, &mdp->comp_list, node) { + err = mtk_mdp_comp_power_off(comp_node); + if (err) + dev_err(&mdp->pdev->dev, "failed to power off after error. err=%d", err); + } + return status; } -static void mtk_mdp_clock_off(struct mtk_mdp_dev *mdp) +static int mtk_mdp_clock_off(struct mtk_mdp_dev *mdp) { + int status, err; struct mtk_mdp_comp *comp_node; - list_for_each_entry(comp_node, &mdp->comp_list, node) - mtk_mdp_comp_power_off(comp_node); + list_for_each_entry(comp_node, &mdp->comp_list, node) { + err = mtk_mdp_comp_power_off(comp_node); + if (err) { + status = err; + goto err_mtk_mdp_comp_power_off; + } + } /* * The master / rdma0 component will have pm_runtime_put called@@ -78,6 +102,17 @@ static void mtk_mdp_clock_off(struct mtk_mdp_dev *mdp) * have mtk_mdp_comp_power_off called on it. */ mtk_mdp_comp_clock_off(&mdp->comp_self); + + return 0; + +err_mtk_mdp_comp_power_off: + list_for_each_entry_continue_reverse(comp_node, &mdp->comp_list, node) { + err = mtk_mdp_comp_power_on(comp_node); + if (err) + dev_err(&mdp->pdev->dev, "failed to power on after error. err=%d", err); + } + + return status; } static void mtk_mdp_wdt_worker(struct work_struct *work)@@ -318,18 +353,14 @@ static int __maybe_unused mtk_mdp_pm_suspend(struct device *dev) { struct mtk_mdp_dev *mdp = dev_get_drvdata(dev); - mtk_mdp_clock_off(mdp); - - return 0; + return mtk_mdp_clock_off(mdp); } static int __maybe_unused mtk_mdp_pm_resume(struct device *dev) { struct mtk_mdp_dev *mdp = dev_get_drvdata(dev); - mtk_mdp_clock_on(mdp); - - return 0; + return mtk_mdp_clock_on(mdp); } static int __maybe_unused mtk_mdp_suspend(struct device *dev)
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