On 4/29/2020 5:44 AM, Matthias Kaehlcke wrote:
On Tue, Apr 28, 2020 at 07:02:53PM +0530, Rajendra Nayak wrote:On some qualcomm platforms DPU needs to express a perforamnce state requirement on a power domain depennding on the clock rates. Use OPP table from DT to register with OPP framework and use dev_pm_opp_set_rate() to set the clk/perf state. Signed-off-by: Rajendra Nayak <rnayak@xxxxxxxxxxxxxx> Cc: Rob Clark <robdclark@xxxxxxxxx> Cc: Sean Paul <sean@xxxxxxxxxx> Cc: dri-devel@xxxxxxxxxxxxxxxxxxxxx --- drivers/gpu/drm/msm/disp/dpu1/dpu_core_perf.c | 3 ++- drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c | 25 ++++++++++++++++++++++++- drivers/gpu/drm/msm/disp/dpu1/dpu_kms.h | 4 ++++ 3 files changed, 30 insertions(+), 2 deletions(-) diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_core_perf.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_core_perf.c index 11f2beb..fe5717df 100644 --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_core_perf.c +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_core_perf.c @@ -7,6 +7,7 @@ #include <linux/debugfs.h> #include <linux/errno.h> #include <linux/mutex.h> +#include <linux/pm_opp.h> #include <linux/sort.h> #include <linux/clk.h> #include <linux/bitmap.h> @@ -239,7 +240,7 @@ static int _dpu_core_perf_set_core_clk_rate(struct dpu_kms *kms, u64 rate) rate = core_clk->max_rate;core_clk->rate = rate;- return msm_dss_clk_set_rate(core_clk, 1); + return dev_pm_opp_set_rate(&kms->pdev->dev, core_clk->rate); }static u64 _dpu_core_perf_get_core_clk_rate(struct dpu_kms *kms)diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c index ce19f1d..2f53bbf 100644 --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c @@ -10,6 +10,7 @@ #include <linux/debugfs.h> #include <linux/dma-buf.h> #include <linux/of_irq.h> +#include <linux/pm_opp.h>#include <drm/drm_crtc.h>#include <drm/drm_file.h> @@ -1033,11 +1034,23 @@ static int dpu_bind(struct device *dev, struct device *master, void *data) if (!dpu_kms) return -ENOMEM;+ dpu_kms->opp_table = dev_pm_opp_set_clkname(dev, "core");+ if (IS_ERR(dpu_kms->opp_table)) + return PTR_ERR(dpu_kms->opp_table); + /* OPP table is optional */ + ret = dev_pm_opp_of_add_table(dev); + if (!ret) { + dpu_kms->has_opp_table = true; + } else if (ret != -ENODEV) { + dev_err(dev, "Invalid OPP table in Device tree\n");nit: s/Device/device/ ? uber-nit: s/Invalid/invalid/ most log messages in this file start with a lower case letter, except for acronyms/register names please also change it in the other drivers unless you disagree.
Sure, will do. Thanks.
+ return ret; + } + mp = &dpu_kms->mp; ret = msm_dss_parse_clock(pdev, mp); if (ret) { DPU_ERROR("failed to parse clocks, ret=%d\n", ret); - return ret; + goto err; }platform_set_drvdata(pdev, dpu_kms);@@ -1051,6 +1064,11 @@ static int dpu_bind(struct device *dev, struct device *master, void *data)priv->kms = &dpu_kms->base;return ret; +err: + if (dpu_kms->has_opp_table) + dev_pm_opp_of_remove_table(dev); + dev_pm_opp_put_clkname(dpu_kms->opp_table); + return ret; }static void dpu_unbind(struct device *dev, struct device *master, void *data)@@ -1059,6 +1077,9 @@ static void dpu_unbind(struct device *dev, struct device *master, void *data) struct dpu_kms *dpu_kms = platform_get_drvdata(pdev); struct dss_module_power *mp = &dpu_kms->mp;+ if (dpu_kms->has_opp_table)+ dev_pm_opp_of_remove_table(dev); + dev_pm_opp_put_clkname(dpu_kms->opp_table); msm_dss_put_clk(mp->clk_config, mp->num_clk); devm_kfree(&pdev->dev, mp->clk_config); mp->num_clk = 0; @@ -1090,6 +1111,8 @@ static int __maybe_unused dpu_runtime_suspend(struct device *dev) struct dpu_kms *dpu_kms = platform_get_drvdata(pdev); struct dss_module_power *mp = &dpu_kms->mp;+ /* Drop the performance state vote */+ dev_pm_opp_set_rate(dev, 0); rc = msm_dss_enable_clk(mp->clk_config, mp->num_clk, false); if (rc) DPU_ERROR("clock disable failed rc:%d\n", rc); diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.h b/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.h index 211f5de9..2a52e4e 100644 --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.h +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.h @@ -128,6 +128,10 @@ struct dpu_kms {struct platform_device *pdev;bool rpm_enabled; + + struct opp_table *opp_table; + bool has_opp_table; + struct dss_module_power mp;/* reference count bandwidth requests, so we know when we canReviewed-by: Matthias Kaehlcke <mka@xxxxxxxxxxxx>
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