Add runtime PM and OPP support to the Host1x driver. For the starter we will keep host1x always-on because dynamic power management require a major refactoring of the driver code since lot's of code paths are missing the RPM handling and we're going to remove some of these paths in the future.
Tested-by: Peter Geis pgwipeout@gmail.com # Ouya T30 Tested-by: Paul Fertser fercerpav@gmail.com # PAZ00 T20 Tested-by: Nicolas Chauvet kwizart@gmail.com # PAZ00 T20 and TK1 T124 Tested-by: Matt Merhar mattmerhar@protonmail.com # Ouya T30 Signed-off-by: Dmitry Osipenko digetx@gmail.com --- drivers/gpu/host1x/debug.c | 15 +++ drivers/gpu/host1x/dev.c | 150 +++++++++++++++++++++++------ drivers/gpu/host1x/dev.h | 3 +- drivers/gpu/host1x/hw/channel_hw.c | 44 ++++----- drivers/gpu/host1x/intr.c | 3 - drivers/gpu/host1x/syncpt.c | 5 +- 6 files changed, 164 insertions(+), 56 deletions(-)
diff --git a/drivers/gpu/host1x/debug.c b/drivers/gpu/host1x/debug.c index 8a14880c61bb..18d9c8d206e3 100644 --- a/drivers/gpu/host1x/debug.c +++ b/drivers/gpu/host1x/debug.c @@ -7,6 +7,7 @@ */
#include <linux/debugfs.h> +#include <linux/pm_runtime.h> #include <linux/seq_file.h> #include <linux/uaccess.h>
@@ -52,6 +53,11 @@ static int show_channel(struct host1x_channel *ch, void *data, bool show_fifo) { struct host1x *m = dev_get_drvdata(ch->dev->parent); struct output *o = data; + int err; + + err = pm_runtime_resume_and_get(m->dev); + if (err < 0) + return err;
mutex_lock(&ch->cdma.lock); mutex_lock(&debug_lock); @@ -64,6 +70,8 @@ static int show_channel(struct host1x_channel *ch, void *data, bool show_fifo) mutex_unlock(&debug_lock); mutex_unlock(&ch->cdma.lock);
+ pm_runtime_put(m->dev); + return 0; }
@@ -71,9 +79,14 @@ static void show_syncpts(struct host1x *m, struct output *o) { struct list_head *pos; unsigned int i; + int err;
host1x_debug_output(o, "---- syncpts ----\n");
+ err = pm_runtime_resume_and_get(m->dev); + if (err < 0) + return; + for (i = 0; i < host1x_syncpt_nb_pts(m); i++) { u32 max = host1x_syncpt_read_max(m->syncpt + i); u32 min = host1x_syncpt_load(m->syncpt + i); @@ -101,6 +114,8 @@ static void show_syncpts(struct host1x *m, struct output *o) base_val); }
+ pm_runtime_put(m->dev); + host1x_debug_output(o, "\n"); }
diff --git a/drivers/gpu/host1x/dev.c b/drivers/gpu/host1x/dev.c index 3d4cabdbc78d..c42ab78327e7 100644 --- a/drivers/gpu/host1x/dev.c +++ b/drivers/gpu/host1x/dev.c @@ -6,14 +6,18 @@ */
#include <linux/clk.h> +#include <linux/delay.h> #include <linux/dma-mapping.h> #include <linux/io.h> #include <linux/list.h> #include <linux/module.h> #include <linux/of_device.h> #include <linux/of.h> +#include <linux/pm_runtime.h> #include <linux/slab.h>
+#include <soc/tegra/common.h> + #define CREATE_TRACE_POINTS #include <trace/events/host1x.h> #undef CREATE_TRACE_POINTS @@ -208,6 +212,9 @@ static void host1x_setup_sid_table(struct host1x *host) const struct host1x_info *info = host->info; unsigned int i;
+ if (!info->has_hypervisor) + return; + for (i = 0; i < info->num_sid_entries; i++) { const struct host1x_sid_entry *entry = &info->sid_table[i];
@@ -365,6 +372,27 @@ static void host1x_iommu_exit(struct host1x *host) } }
+static int host1x_get_resets(struct host1x *host) +{ + int err; + + host->resets[0].id = "mc"; + host->resets[1].id = "host1x"; + host->nresets = ARRAY_SIZE(host->resets); + + err = devm_reset_control_bulk_get_optional_exclusive_released( + host->dev, host->nresets, host->resets); + if (err) { + dev_err(host->dev, "failed to get reset: %d\n", err); + return err; + } + + if (WARN_ON(!host->resets[1].rstc)) + return -ENOENT; + + return 0; +} + static int host1x_probe(struct platform_device *pdev) { struct host1x *host; @@ -442,12 +470,9 @@ static int host1x_probe(struct platform_device *pdev) return err; }
- host->rst = devm_reset_control_get(&pdev->dev, "host1x"); - if (IS_ERR(host->rst)) { - err = PTR_ERR(host->rst); - dev_err(&pdev->dev, "failed to get reset: %d\n", err); + err = host1x_get_resets(host); + if (err) return err; - }
err = host1x_iommu_init(host); if (err < 0) { @@ -462,22 +487,10 @@ static int host1x_probe(struct platform_device *pdev) goto iommu_exit; }
- err = clk_prepare_enable(host->clk); - if (err < 0) { - dev_err(&pdev->dev, "failed to enable clock\n"); - goto free_channels; - } - - err = reset_control_deassert(host->rst); - if (err < 0) { - dev_err(&pdev->dev, "failed to deassert reset: %d\n", err); - goto unprepare_disable; - } - err = host1x_syncpt_init(host); if (err) { dev_err(&pdev->dev, "failed to initialize syncpts\n"); - goto reset_assert; + goto free_channels; }
err = host1x_intr_init(host, syncpt_irq); @@ -486,10 +499,18 @@ static int host1x_probe(struct platform_device *pdev) goto deinit_syncpt; }
- host1x_debug_init(host); + pm_runtime_enable(&pdev->dev); + + err = devm_tegra_core_dev_init_opp_table_common(&pdev->dev); + if (err) + goto pm_disable;
- if (host->info->has_hypervisor) - host1x_setup_sid_table(host); + /* the driver's code isn't ready yet for the dynamic RPM */ + err = pm_runtime_resume_and_get(&pdev->dev); + if (err) + goto pm_disable; + + host1x_debug_init(host);
err = host1x_register(host); if (err < 0) @@ -505,13 +526,14 @@ static int host1x_probe(struct platform_device *pdev) host1x_unregister(host); deinit_debugfs: host1x_debug_deinit(host); + + pm_runtime_put_sync_suspend(&pdev->dev); +pm_disable: + pm_runtime_disable(&pdev->dev); + host1x_intr_deinit(host); deinit_syncpt: host1x_syncpt_deinit(host); -reset_assert: - reset_control_assert(host->rst); -unprepare_disable: - clk_disable_unprepare(host->clk); free_channels: host1x_channel_list_free(&host->channel_list); iommu_exit: @@ -526,20 +548,94 @@ static int host1x_remove(struct platform_device *pdev)
host1x_unregister(host); host1x_debug_deinit(host); + + pm_runtime_force_suspend(&pdev->dev); + host1x_intr_deinit(host); host1x_syncpt_deinit(host); - reset_control_assert(host->rst); - clk_disable_unprepare(host->clk); host1x_iommu_exit(host); host1x_bo_cache_destroy(&host->cache);
return 0; }
+static int __maybe_unused host1x_runtime_suspend(struct device *dev) +{ + struct host1x *host = dev_get_drvdata(dev); + int err; + + host1x_intr_stop(host); + host1x_syncpt_save(host); + + err = reset_control_bulk_assert(host->nresets, host->resets); + if (err) { + dev_err(dev, "failed to assert reset: %d\n", err); + goto resume_host1x; + } + + usleep_range(1000, 2000); + + clk_disable_unprepare(host->clk); + reset_control_bulk_release(host->nresets, host->resets); + + return 0; + +resume_host1x: + host1x_setup_sid_table(host); + host1x_syncpt_restore(host); + host1x_intr_start(host); + + return err; +} + +static int __maybe_unused host1x_runtime_resume(struct device *dev) +{ + struct host1x *host = dev_get_drvdata(dev); + int err; + + err = reset_control_bulk_acquire(host->nresets, host->resets); + if (err) { + dev_err(dev, "failed to acquire reset: %d\n", err); + return err; + } + + err = clk_prepare_enable(host->clk); + if (err) { + dev_err(dev, "failed to enable clock: %d\n", err); + goto release_reset; + } + + err = reset_control_bulk_deassert(host->nresets, host->resets); + if (err < 0) { + dev_err(dev, "failed to deassert reset: %d\n", err); + goto disable_clk; + } + + host1x_setup_sid_table(host); + host1x_syncpt_restore(host); + host1x_intr_start(host); + + return 0; + +disable_clk: + clk_disable_unprepare(host->clk); +release_reset: + reset_control_bulk_release(host->nresets, host->resets); + + return err; +} + +static const struct dev_pm_ops host1x_pm = { + SET_RUNTIME_PM_OPS(host1x_runtime_suspend, host1x_runtime_resume, + NULL) + /* TODO: add system suspend-resume once driver will be ready for that */ +}; + static struct platform_driver tegra_host1x_driver = { .driver = { .name = "tegra-host1x", .of_match_table = host1x_of_match, + .pm = &host1x_pm, }, .probe = host1x_probe, .remove = host1x_remove, diff --git a/drivers/gpu/host1x/dev.h b/drivers/gpu/host1x/dev.h index 5b7fdea5d169..ca4b082f0cd4 100644 --- a/drivers/gpu/host1x/dev.h +++ b/drivers/gpu/host1x/dev.h @@ -118,7 +118,8 @@ struct host1x { struct host1x_syncpt_base *bases; struct device *dev; struct clk *clk; - struct reset_control *rst; + struct reset_control_bulk_data resets[2]; + unsigned int nresets;
struct iommu_group *group; struct iommu_domain *domain; diff --git a/drivers/gpu/host1x/hw/channel_hw.c b/drivers/gpu/host1x/hw/channel_hw.c index 1999780a7203..6b40e9af1e88 100644 --- a/drivers/gpu/host1x/hw/channel_hw.c +++ b/drivers/gpu/host1x/hw/channel_hw.c @@ -159,6 +159,27 @@ static void host1x_channel_set_streamid(struct host1x_channel *channel) #endif }
+static void host1x_enable_gather_filter(struct host1x_channel *ch) +{ +#if HOST1X_HW >= 6 + struct host1x *host = dev_get_drvdata(ch->dev->parent); + u32 val; + + if (!host->hv_regs) + return; + + val = host1x_hypervisor_readl( + host, HOST1X_HV_CH_KERNEL_FILTER_GBUFFER(ch->id / 32)); + val |= BIT(ch->id % 32); + host1x_hypervisor_writel( + host, val, HOST1X_HV_CH_KERNEL_FILTER_GBUFFER(ch->id / 32)); +#elif HOST1X_HW >= 4 + host1x_ch_writel(ch, + HOST1X_CHANNEL_CHANNELCTRL_KERNEL_FILTER_GBUFFER(1), + HOST1X_CHANNEL_CHANNELCTRL); +#endif +} + static int channel_submit(struct host1x_job *job) { struct host1x_channel *ch = job->channel; @@ -190,6 +211,7 @@ static int channel_submit(struct host1x_job *job) }
host1x_channel_set_streamid(ch); + host1x_enable_gather_filter(ch);
/* begin a CDMA submit */ err = host1x_cdma_begin(&ch->cdma, job); @@ -249,27 +271,6 @@ static int channel_submit(struct host1x_job *job) return err; }
-static void enable_gather_filter(struct host1x *host, - struct host1x_channel *ch) -{ -#if HOST1X_HW >= 6 - u32 val; - - if (!host->hv_regs) - return; - - val = host1x_hypervisor_readl( - host, HOST1X_HV_CH_KERNEL_FILTER_GBUFFER(ch->id / 32)); - val |= BIT(ch->id % 32); - host1x_hypervisor_writel( - host, val, HOST1X_HV_CH_KERNEL_FILTER_GBUFFER(ch->id / 32)); -#elif HOST1X_HW >= 4 - host1x_ch_writel(ch, - HOST1X_CHANNEL_CHANNELCTRL_KERNEL_FILTER_GBUFFER(1), - HOST1X_CHANNEL_CHANNELCTRL); -#endif -} - static int host1x_channel_init(struct host1x_channel *ch, struct host1x *dev, unsigned int index) { @@ -278,7 +279,6 @@ static int host1x_channel_init(struct host1x_channel *ch, struct host1x *dev, #else ch->regs = dev->regs + index * 0x100; #endif - enable_gather_filter(dev, ch); return 0; }
diff --git a/drivers/gpu/host1x/intr.c b/drivers/gpu/host1x/intr.c index 45b6be927ec4..965ba21818b1 100644 --- a/drivers/gpu/host1x/intr.c +++ b/drivers/gpu/host1x/intr.c @@ -297,14 +297,11 @@ int host1x_intr_init(struct host1x *host, unsigned int irq_sync) "host1x_sp_%02u", id); }
- host1x_intr_start(host); - return 0; }
void host1x_intr_deinit(struct host1x *host) { - host1x_intr_stop(host); }
void host1x_intr_start(struct host1x *host) diff --git a/drivers/gpu/host1x/syncpt.c b/drivers/gpu/host1x/syncpt.c index d198a10848c6..e08e331e46ae 100644 --- a/drivers/gpu/host1x/syncpt.c +++ b/drivers/gpu/host1x/syncpt.c @@ -143,6 +143,8 @@ void host1x_syncpt_restore(struct host1x *host) for (i = 0; i < host1x_syncpt_nb_bases(host); i++) host1x_hw_syncpt_restore_wait_base(host, sp_base + i);
+ host1x_hw_syncpt_enable_protection(host); + wmb(); }
@@ -366,9 +368,6 @@ int host1x_syncpt_init(struct host1x *host) host->syncpt = syncpt; host->bases = bases;
- host1x_syncpt_restore(host); - host1x_hw_syncpt_enable_protection(host); - /* Allocate sync point to use for clearing waits for expired fences */ host->nop_sp = host1x_syncpt_alloc(host, 0, "reserved-nop"); if (!host->nop_sp)