PM / devfreq: exynos-bus: Convert to use dev_pm_opp_set_rate()
Reuse opp core code for setting bus clock and voltage. As a side effect this allow usage of coupled regulators feature (required for boards using Exynos5422/5800 SoCs) because dev_pm_opp_set_rate() uses regulator_set_voltage_triplet() for setting regulator voltage while the old code used regulator_set_voltage_tol() with fixed tolerance. This patch also removes no longer needed parsing of DT property "exynos,voltage-tolerance" (no Exynos devfreq DT node uses it). After applying changes both functions exynos_bus_passive_target() and exynos_bus_target() have the same code, so remove exynos_bus_passive_target(). In exynos_bus_probe() replace it with exynos_bus_target. Signed-off-by: Kamil Konieczny <k.konieczny@partner.samsung.com> Acked-by: Chanwoo Choi <cw00.choi@samsung.com> Signed-off-by: MyungJoo Ham <myungjoo.ham@samsung.com>
This commit is contained in:
Kamil Konieczny
MyungJoo Ham
Родитель
2c2b20e0da
Коммит
4294a779bd
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@ -22,7 +22,6 @@
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#include <linux/slab.h>
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#define DEFAULT_SATURATION_RATIO 40
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#define DEFAULT_VOLTAGE_TOLERANCE 2
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struct exynos_bus {
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struct device *dev;
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@ -34,9 +33,8 @@ struct exynos_bus {
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unsigned long curr_freq;
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struct regulator *regulator;
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struct opp_table *opp_table;
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struct clk *clk;
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unsigned int voltage_tolerance;
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unsigned int ratio;
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};
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@ -90,62 +88,29 @@ static int exynos_bus_get_event(struct exynos_bus *bus,
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}
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/*
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* Must necessary function for devfreq simple-ondemand governor
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* devfreq function for both simple-ondemand and passive governor
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*/
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static int exynos_bus_target(struct device *dev, unsigned long *freq, u32 flags)
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{
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struct exynos_bus *bus = dev_get_drvdata(dev);
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struct dev_pm_opp *new_opp;
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unsigned long old_freq, new_freq, new_volt, tol;
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int ret = 0;
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/* Get new opp-bus instance according to new bus clock */
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/* Get correct frequency for bus. */
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new_opp = devfreq_recommended_opp(dev, freq, flags);
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if (IS_ERR(new_opp)) {
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dev_err(dev, "failed to get recommended opp instance\n");
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return PTR_ERR(new_opp);
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}
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new_freq = dev_pm_opp_get_freq(new_opp);
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new_volt = dev_pm_opp_get_voltage(new_opp);
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dev_pm_opp_put(new_opp);
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old_freq = bus->curr_freq;
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if (old_freq == new_freq)
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return 0;
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tol = new_volt * bus->voltage_tolerance / 100;
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/* Change voltage and frequency according to new OPP level */
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mutex_lock(&bus->lock);
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ret = dev_pm_opp_set_rate(dev, *freq);
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if (!ret)
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bus->curr_freq = *freq;
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if (old_freq < new_freq) {
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ret = regulator_set_voltage_tol(bus->regulator, new_volt, tol);
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if (ret < 0) {
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dev_err(bus->dev, "failed to set voltage\n");
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goto out;
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}
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}
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ret = clk_set_rate(bus->clk, new_freq);
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if (ret < 0) {
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dev_err(dev, "failed to change clock of bus\n");
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clk_set_rate(bus->clk, old_freq);
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goto out;
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}
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if (old_freq > new_freq) {
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ret = regulator_set_voltage_tol(bus->regulator, new_volt, tol);
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if (ret < 0) {
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dev_err(bus->dev, "failed to set voltage\n");
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goto out;
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}
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}
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bus->curr_freq = new_freq;
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dev_dbg(dev, "Set the frequency of bus (%luHz -> %luHz, %luHz)\n",
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old_freq, new_freq, clk_get_rate(bus->clk));
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out:
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mutex_unlock(&bus->lock);
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return ret;
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@ -193,54 +158,10 @@ static void exynos_bus_exit(struct device *dev)
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dev_pm_opp_of_remove_table(dev);
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clk_disable_unprepare(bus->clk);
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if (bus->regulator)
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regulator_disable(bus->regulator);
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}
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/*
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* Must necessary function for devfreq passive governor
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*/
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static int exynos_bus_passive_target(struct device *dev, unsigned long *freq,
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u32 flags)
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{
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struct exynos_bus *bus = dev_get_drvdata(dev);
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struct dev_pm_opp *new_opp;
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unsigned long old_freq, new_freq;
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int ret = 0;
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/* Get new opp-bus instance according to new bus clock */
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new_opp = devfreq_recommended_opp(dev, freq, flags);
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if (IS_ERR(new_opp)) {
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dev_err(dev, "failed to get recommended opp instance\n");
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return PTR_ERR(new_opp);
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if (bus->opp_table) {
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dev_pm_opp_put_regulators(bus->opp_table);
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bus->opp_table = NULL;
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}
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new_freq = dev_pm_opp_get_freq(new_opp);
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dev_pm_opp_put(new_opp);
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old_freq = bus->curr_freq;
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if (old_freq == new_freq)
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return 0;
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/* Change the frequency according to new OPP level */
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mutex_lock(&bus->lock);
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ret = clk_set_rate(bus->clk, new_freq);
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if (ret < 0) {
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dev_err(dev, "failed to set the clock of bus\n");
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goto out;
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}
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*freq = new_freq;
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bus->curr_freq = new_freq;
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dev_dbg(dev, "Set the frequency of bus (%luHz -> %luHz, %luHz)\n",
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old_freq, new_freq, clk_get_rate(bus->clk));
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out:
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mutex_unlock(&bus->lock);
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return ret;
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}
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static void exynos_bus_passive_exit(struct device *dev)
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@ -255,21 +176,19 @@ static int exynos_bus_parent_parse_of(struct device_node *np,
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struct exynos_bus *bus)
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{
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struct device *dev = bus->dev;
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struct opp_table *opp_table;
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const char *vdd = "vdd";
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int i, ret, count, size;
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/* Get the regulator to provide each bus with the power */
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bus->regulator = devm_regulator_get(dev, "vdd");
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if (IS_ERR(bus->regulator)) {
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dev_err(dev, "failed to get VDD regulator\n");
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return PTR_ERR(bus->regulator);
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}
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ret = regulator_enable(bus->regulator);
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if (ret < 0) {
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dev_err(dev, "failed to enable VDD regulator\n");
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opp_table = dev_pm_opp_set_regulators(dev, &vdd, 1);
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if (IS_ERR(opp_table)) {
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ret = PTR_ERR(opp_table);
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dev_err(dev, "failed to set regulators %d\n", ret);
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return ret;
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}
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bus->opp_table = opp_table;
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/*
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* Get the devfreq-event devices to get the current utilization of
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* buses. This raw data will be used in devfreq ondemand governor.
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@ -310,14 +229,11 @@ static int exynos_bus_parent_parse_of(struct device_node *np,
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if (of_property_read_u32(np, "exynos,saturation-ratio", &bus->ratio))
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bus->ratio = DEFAULT_SATURATION_RATIO;
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if (of_property_read_u32(np, "exynos,voltage-tolerance",
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&bus->voltage_tolerance))
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bus->voltage_tolerance = DEFAULT_VOLTAGE_TOLERANCE;
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return 0;
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err_regulator:
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regulator_disable(bus->regulator);
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dev_pm_opp_put_regulators(bus->opp_table);
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bus->opp_table = NULL;
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return ret;
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}
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@ -468,7 +384,7 @@ static int exynos_bus_probe(struct platform_device *pdev)
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goto out;
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passive:
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/* Initialize the struct profile and governor data for passive device */
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profile->target = exynos_bus_passive_target;
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profile->target = exynos_bus_target;
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profile->exit = exynos_bus_passive_exit;
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/* Get the instance of parent devfreq device */
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@ -508,8 +424,10 @@ err:
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dev_pm_opp_of_remove_table(dev);
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clk_disable_unprepare(bus->clk);
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err_reg:
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if (!passive)
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regulator_disable(bus->regulator);
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if (!passive) {
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dev_pm_opp_put_regulators(bus->opp_table);
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bus->opp_table = NULL;
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}
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return ret;
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}
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