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Subject[PATCH v1 05/12] thermal: tegra: add support for gpu hw-throttle
Date
Add support to trigger pulse skippers on the GPU
when a HOT trip point is triggered. The pulse skippers
can be signalled to throttle at low, medium and high
depths\levels.

Signed-off-by: Wei Ni <wni@nvidia.com>
---
drivers/thermal/tegra/soctherm.c | 118 ++++++++++++++++++++++++++++-----------
1 file changed, 85 insertions(+), 33 deletions(-)

diff --git a/drivers/thermal/tegra/soctherm.c b/drivers/thermal/tegra/soctherm.c
index 673c3ffa9001..d3cef88a3f22 100644
--- a/drivers/thermal/tegra/soctherm.c
+++ b/drivers/thermal/tegra/soctherm.c
@@ -1,5 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0
/*
- * Copyright (c) 2014, NVIDIA CORPORATION. All rights reserved.
+ * Copyright (c) 2014 - 2018, NVIDIA CORPORATION. All rights reserved.
*
* Author:
* Mikko Perttunen <mperttunen@nvidia.com>
@@ -160,6 +161,15 @@
/* get dividend from the depth */
#define THROT_DEPTH_DIVIDEND(depth) ((256 * (100 - (depth)) / 100) - 1)

+/* gk20a nv_therm interface N:3 Mapping. Levels defined in tegra124-sochterm.h
+ * level vector
+ * NONE 3'b000
+ * LOW 3'b001
+ * MED 3'b011
+ * HIGH 3'b111
+ */
+#define THROT_LEVEL_TO_DEPTH(level) ((0x1 << (level)) - 1)
+
/* get THROT_PSKIP_xxx offset per LIGHT/HEAVY throt and CPU/GPU dev */
#define THROT_OFFSET 0x30
#define THROT_PSKIP_CTRL(throt, dev) (THROT_PSKIP_CTRL_LITE_CPU + \
@@ -219,6 +229,7 @@ struct soctherm_throt_cfg {
u8 priority;
u8 cpu_throt_level;
u32 cpu_throt_depth;
+ u32 gpu_throt_level;
struct thermal_cooling_device *cdev;
bool init;
};
@@ -974,6 +985,50 @@ static int soctherm_thermtrips_parse(struct platform_device *pdev)
return 0;
}

+static int soctherm_throt_cfg_parse(struct device *dev,
+ struct device_node *np,
+ struct soctherm_throt_cfg *stc)
+{
+ struct tegra_soctherm *ts = dev_get_drvdata(dev);
+ int ret;
+ u32 val;
+
+ ret = of_property_read_u32(np, "nvidia,priority", &val);
+ if (ret) {
+ dev_err(dev, "throttle-cfg: %s: invalid priority\n", stc->name);
+ return -EINVAL;
+ }
+ stc->priority = val;
+
+ ret = of_property_read_u32(np, ts->soc->use_ccroc ?
+ "nvidia,cpu-throt-level" :
+ "nvidia,cpu-throt-percent", &val);
+ if (!ret) {
+ if (ts->soc->use_ccroc &&
+ val <= TEGRA_SOCTHERM_THROT_LEVEL_HIGH)
+ stc->cpu_throt_level = val;
+ else if (!ts->soc->use_ccroc && val <= 100)
+ stc->cpu_throt_depth = val;
+ else
+ goto err;
+ } else {
+ goto err;
+ }
+
+ ret = of_property_read_u32(np, "nvidia,gpu-throt-level", &val);
+ if (!ret && val <= TEGRA_SOCTHERM_THROT_LEVEL_HIGH)
+ stc->gpu_throt_level = val;
+ else
+ goto err;
+
+ return 0;
+
+err:
+ dev_err(dev, "throttle-cfg: %s: no throt prop or invalid prop\n",
+ stc->name);
+ return -EINVAL;
+}
+
/**
* soctherm_init_hw_throt_cdev() - Parse the HW throttle configurations
* and register them as cooling devices.
@@ -984,8 +1039,7 @@ static void soctherm_init_hw_throt_cdev(struct platform_device *pdev)
struct tegra_soctherm *ts = dev_get_drvdata(dev);
struct device_node *np_stc, *np_stcc;
const char *name;
- u32 val;
- int i, r;
+ int i;

for (i = 0; i < THROTTLE_SIZE; i++) {
ts->throt_cfgs[i].name = throt_names[i];
@@ -1003,6 +1057,7 @@ static void soctherm_init_hw_throt_cdev(struct platform_device *pdev)
for_each_child_of_node(np_stc, np_stcc) {
struct soctherm_throt_cfg *stc;
struct thermal_cooling_device *tcd;
+ int err;

name = np_stcc->name;
stc = find_throttle_cfg_by_name(ts, name);
@@ -1012,37 +1067,10 @@ static void soctherm_init_hw_throt_cdev(struct platform_device *pdev)
continue;
}

- r = of_property_read_u32(np_stcc, "nvidia,priority", &val);
- if (r) {
- dev_info(dev,
- "throttle-cfg: %s: missing priority\n", name);
+
+ err = soctherm_throt_cfg_parse(dev, np_stcc, stc);
+ if (err)
continue;
- }
- stc->priority = val;
-
- if (ts->soc->use_ccroc) {
- r = of_property_read_u32(np_stcc,
- "nvidia,cpu-throt-level",
- &val);
- if (r) {
- dev_info(dev,
- "throttle-cfg: %s: missing cpu-throt-level\n",
- name);
- continue;
- }
- stc->cpu_throt_level = val;
- } else {
- r = of_property_read_u32(np_stcc,
- "nvidia,cpu-throt-percent",
- &val);
- if (r) {
- dev_info(dev,
- "throttle-cfg: %s: missing cpu-throt-percent\n",
- name);
- continue;
- }
- stc->cpu_throt_depth = val;
- }

tcd = thermal_of_cooling_device_register(np_stcc,
(char *)name, ts,
@@ -1186,6 +1214,28 @@ static void throttlectl_cpu_mn(struct tegra_soctherm *ts,
}

/**
+ * throttlectl_gpu_level_select() - selects throttling level for GPU
+ * @throt: the LIGHT/HEAVY of throttle event id
+ *
+ * This function programs soctherm's interface to GK20a NV_THERM to select
+ * pre-configured "Low", "Medium" or "Heavy" throttle levels.
+ *
+ * Return: boolean true if HW was programmed
+ */
+static void throttlectl_gpu_level_select(struct tegra_soctherm *ts,
+ enum soctherm_throttle_id throt)
+{
+ u32 r, level, throt_vect;
+
+ level = ts->throt_cfgs[throt].gpu_throt_level;
+ throt_vect = THROT_LEVEL_TO_DEPTH(level);
+ r = readl(ts->regs + THROT_PSKIP_CTRL(throt, THROTTLE_DEV_GPU));
+ r = REG_SET_MASK(r, THROT_PSKIP_CTRL_ENABLE_MASK, 1);
+ r = REG_SET_MASK(r, THROT_PSKIP_CTRL_VECT_GPU_MASK, throt_vect);
+ writel(r, ts->regs + THROT_PSKIP_CTRL(throt, THROTTLE_DEV_GPU));
+}
+
+/**
* soctherm_throttle_program() - programs pulse skippers' configuration
* @throt: the LIGHT/HEAVY of the throttle event id.
*
@@ -1207,6 +1257,8 @@ static void soctherm_throttle_program(struct tegra_soctherm *ts,
else
throttlectl_cpu_mn(ts, throt);

+ throttlectl_gpu_level_select(ts, throt);
+
r = REG_SET_MASK(0, THROT_PRIORITY_LITE_PRIO_MASK, stc.priority);
writel(r, ts->regs + THROT_PRIORITY_CTRL(throt));

--
2.7.4
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