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Diffstat (limited to 'target/linux/brcm2708/patches-4.14/950-0234-firmware-raspberrypi-Add-a-get_throttled-sysfs-file.patch')
-rw-r--r--target/linux/brcm2708/patches-4.14/950-0234-firmware-raspberrypi-Add-a-get_throttled-sysfs-file.patch206
1 files changed, 0 insertions, 206 deletions
diff --git a/target/linux/brcm2708/patches-4.14/950-0234-firmware-raspberrypi-Add-a-get_throttled-sysfs-file.patch b/target/linux/brcm2708/patches-4.14/950-0234-firmware-raspberrypi-Add-a-get_throttled-sysfs-file.patch
deleted file mode 100644
index ad6ea4b999..0000000000
--- a/target/linux/brcm2708/patches-4.14/950-0234-firmware-raspberrypi-Add-a-get_throttled-sysfs-file.patch
+++ /dev/null
@@ -1,206 +0,0 @@
-From 83a8df1b7fff284fc3c2277c8051f53acde2e64f Mon Sep 17 00:00:00 2001
-From: =?UTF-8?q?Noralf=20Tr=C3=B8nnes?= <noralf@tronnes.org>
-Date: Sat, 24 Feb 2018 13:41:25 +0100
-Subject: [PATCH 234/454] firmware/raspberrypi: Add a get_throttled sysfs file
-MIME-Version: 1.0
-Content-Type: text/plain; charset=UTF-8
-Content-Transfer-Encoding: 8bit
-
-Under-voltage due to inadequate power supplies is a recurring problem for
-new Raspberry Pi users. There are visual indications that an
-under-voltage situation is occuring like blinking power led and a
-lightning icon on the desktop (not shown when using the vc4 driver), but
-for new users it's not obvious that this signifies a critical situation.
-
-This patch provides a twofold improvement to the situation:
-
-Firstly it logs under-voltage events to the kernel log. This provides
-information also for headless installations.
-
-Secondly it provides a sysfs file to read the value. This improves on
-'vcgencmd' by providing change notification. Userspace can poll on the
-file and be notified of changes to the value.
-A script can poll the file and use dbus notification to put a windows on
-the desktop with information about the severity with a recommendation to
-change the power supply. A link to more information can also be provided.
-Only changes to the sticky bits are reported (cleared between readings).
-
-Signed-off-by: Noralf Trønnes <noralf@tronnes.org>
----
- drivers/firmware/raspberrypi.c | 108 +++++++++++++++++++++
- include/soc/bcm2835/raspberrypi-firmware.h | 1 +
- 2 files changed, 109 insertions(+)
-
---- a/drivers/firmware/raspberrypi.c
-+++ b/drivers/firmware/raspberrypi.c
-@@ -14,6 +14,7 @@
- #include <linux/module.h>
- #include <linux/of_platform.h>
- #include <linux/platform_device.h>
-+#include <linux/workqueue.h>
- #include <soc/bcm2835/raspberrypi-firmware.h>
-
- #define MBOX_MSG(chan, data28) (((data28) & ~0xf) | ((chan) & 0xf))
-@@ -21,11 +22,14 @@
- #define MBOX_DATA28(msg) ((msg) & ~0xf)
- #define MBOX_CHAN_PROPERTY 8
-
-+#define UNDERVOLTAGE_BIT BIT(0)
-+
- struct rpi_firmware {
- struct mbox_client cl;
- struct mbox_chan *chan; /* The property channel. */
- struct completion c;
- u32 enabled;
-+ struct delayed_work get_throttled_poll_work;
- };
-
- static struct platform_device *g_pdev;
-@@ -166,6 +170,101 @@ int rpi_firmware_property(struct rpi_fir
- }
- EXPORT_SYMBOL_GPL(rpi_firmware_property);
-
-+static int rpi_firmware_get_throttled(struct rpi_firmware *fw, u32 *value)
-+{
-+ static ktime_t old_timestamp;
-+ static u32 old_value;
-+ u32 new_sticky, old_sticky, new_uv, old_uv;
-+ ktime_t new_timestamp;
-+ s64 elapsed_ms;
-+ int ret;
-+
-+ if (!fw)
-+ return -EBUSY;
-+
-+ /*
-+ * We can't run faster than the sticky shift (100ms) since we get
-+ * flipping in the sticky bits that are cleared.
-+ * This happens on polling, so just return the previous value.
-+ */
-+ new_timestamp = ktime_get();
-+ elapsed_ms = ktime_ms_delta(new_timestamp, old_timestamp);
-+ if (elapsed_ms < 150) {
-+ *value = old_value;
-+ return 0;
-+ }
-+ old_timestamp = new_timestamp;
-+
-+ /* Clear sticky bits */
-+ *value = 0xffff;
-+
-+ ret = rpi_firmware_property(fw, RPI_FIRMWARE_GET_THROTTLED,
-+ value, sizeof(*value));
-+ if (ret)
-+ return ret;
-+
-+ new_sticky = *value >> 16;
-+ old_sticky = old_value >> 16;
-+ old_value = *value;
-+
-+ /* Only notify about changes in the sticky bits */
-+ if (new_sticky == old_sticky)
-+ return 0;
-+
-+ new_uv = new_sticky & UNDERVOLTAGE_BIT;
-+ old_uv = old_sticky & UNDERVOLTAGE_BIT;
-+
-+ if (new_uv != old_uv) {
-+ if (new_uv)
-+ pr_crit("Under-voltage detected! (0x%08x)\n", *value);
-+ else
-+ pr_info("Voltage normalised (0x%08x)\n", *value);
-+ }
-+
-+ sysfs_notify(&fw->cl.dev->kobj, NULL, "get_throttled");
-+
-+ return 0;
-+}
-+
-+static void get_throttled_poll(struct work_struct *work)
-+{
-+ struct rpi_firmware *fw = container_of(work, struct rpi_firmware,
-+ get_throttled_poll_work.work);
-+ u32 dummy;
-+ int ret;
-+
-+ ret = rpi_firmware_get_throttled(fw, &dummy);
-+ if (ret)
-+ pr_debug("%s: Failed to read value (%d)", __func__, ret);
-+
-+ schedule_delayed_work(&fw->get_throttled_poll_work, 2 * HZ);
-+}
-+
-+static ssize_t get_throttled_show(struct device *dev,
-+ struct device_attribute *attr, char *buf)
-+{
-+ struct rpi_firmware *fw = dev_get_drvdata(dev);
-+ u32 value;
-+ int ret;
-+
-+ ret = rpi_firmware_get_throttled(fw, &value);
-+ if (ret)
-+ return ret;
-+
-+ return sprintf(buf, "%x\n", value);
-+}
-+
-+static DEVICE_ATTR_RO(get_throttled);
-+
-+static struct attribute *rpi_firmware_dev_attrs[] = {
-+ &dev_attr_get_throttled.attr,
-+ NULL,
-+};
-+
-+static const struct attribute_group rpi_firmware_dev_group = {
-+ .attrs = rpi_firmware_dev_attrs,
-+};
-+
- static void
- rpi_firmware_print_firmware_revision(struct rpi_firmware *fw)
- {
-@@ -190,6 +289,11 @@ static int rpi_firmware_probe(struct pla
- {
- struct device *dev = &pdev->dev;
- struct rpi_firmware *fw;
-+ int ret;
-+
-+ ret = devm_device_add_group(dev, &rpi_firmware_dev_group);
-+ if (ret)
-+ return ret;
-
- fw = devm_kzalloc(dev, sizeof(*fw), GFP_KERNEL);
- if (!fw)
-@@ -208,12 +312,15 @@ static int rpi_firmware_probe(struct pla
- }
-
- init_completion(&fw->c);
-+ INIT_DELAYED_WORK(&fw->get_throttled_poll_work, get_throttled_poll);
-
- platform_set_drvdata(pdev, fw);
- g_pdev = pdev;
-
- rpi_firmware_print_firmware_revision(fw);
-
-+ schedule_delayed_work(&fw->get_throttled_poll_work, 0);
-+
- return 0;
- }
-
-@@ -221,6 +328,7 @@ static int rpi_firmware_remove(struct pl
- {
- struct rpi_firmware *fw = platform_get_drvdata(pdev);
-
-+ cancel_delayed_work_sync(&fw->get_throttled_poll_work);
- mbox_free_channel(fw->chan);
- g_pdev = NULL;
-
---- a/include/soc/bcm2835/raspberrypi-firmware.h
-+++ b/include/soc/bcm2835/raspberrypi-firmware.h
-@@ -77,6 +77,7 @@ enum rpi_firmware_property_tag {
- RPI_FIRMWARE_GET_EDID_BLOCK = 0x00030020,
- RPI_FIRMWARE_GET_CUSTOMER_OTP = 0x00030021,
- RPI_FIRMWARE_GET_DOMAIN_STATE = 0x00030030,
-+ RPI_FIRMWARE_GET_THROTTLED = 0x00030046,
- RPI_FIRMWARE_SET_CLOCK_STATE = 0x00038001,
- RPI_FIRMWARE_SET_CLOCK_RATE = 0x00038002,
- RPI_FIRMWARE_SET_VOLTAGE = 0x00038003,
generated by cgit v1.2.3 (git 2.25.1) at 2024-09-09 22:42:06 +0000