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Date: Mon, 9 Jun 2014 16:02:26 +0100
From: Richard Fitzgerald <rf@...nsource.wolfsonmicro.com>
To: sameo@...ux.intel.com, lee.jones@...aro.org,
ckeepax@...nsource.wolfsonmicro.com, broonie@...nel.org,
lgirdwood@...il.com, perex@...ex.cz, tiwai@...e.de
Cc: alsa-devel@...a-project.org, patches@...nsource.wolfsonmicro.com,
linux-kernel@...r.kernel.org
Subject: [PATCH 1/4] mfd: arizona: Export function to control subsystem DVFS
Moving this control from being a side-effect of the LDO1
regulator driver to a specific exported function.
Signed-off-by: Richard Fitzgerald <rf@...nsource.wolfsonmicro.com>
---
drivers/mfd/arizona-core.c | 84 ++++++++++++++++++++++++++++++++++++++
include/linux/mfd/arizona/core.h | 12 +++++
2 files changed, 96 insertions(+), 0 deletions(-)
diff --git a/drivers/mfd/arizona-core.c b/drivers/mfd/arizona-core.c
index 58e1fe5..a1b4fe6 100644
--- a/drivers/mfd/arizona-core.c
+++ b/drivers/mfd/arizona-core.c
@@ -94,6 +94,89 @@ int arizona_clk32k_disable(struct arizona *arizona)
}
EXPORT_SYMBOL_GPL(arizona_clk32k_disable);
+int arizona_dvfs_up(struct arizona *arizona, unsigned int mask)
+{
+ unsigned int new_flags;
+ int ret = 0;
+
+ mutex_lock(&arizona->subsys_max_lock);
+
+ new_flags = arizona->subsys_max_rq | mask;
+
+ if (arizona->subsys_max_rq != new_flags) {
+ switch (arizona->type) {
+ case WM5102:
+ case WM8997:
+ ret = regulator_set_voltage(arizona->dcvdd,
+ 1800000, 1800000);
+ if (ret != 0) {
+ dev_err(arizona->dev,
+ "Failed to raise dcvdd (%u)\n", ret);
+ goto err;
+ }
+
+ ret = regmap_update_bits(arizona->regmap,
+ ARIZONA_DYNAMIC_FREQUENCY_SCALING_1,
+ ARIZONA_SUBSYS_MAX_FREQ, 1);
+ if (ret != 0) {
+ dev_err(arizona->dev,
+ "Failed to enable subsys max (%u)\n",
+ ret);
+ regulator_set_voltage(arizona->dcvdd,
+ 1200000, 1800000);
+ goto err;
+ }
+ break;
+
+ default:
+ break;
+ }
+
+ arizona->subsys_max_rq = new_flags;
+ }
+err:
+ mutex_unlock(&arizona->subsys_max_lock);
+ return ret;
+}
+EXPORT_SYMBOL_GPL(arizona_dvfs_up);
+
+int arizona_dvfs_down(struct arizona *arizona, unsigned int mask)
+{
+ int ret = 0;
+
+ mutex_lock(&arizona->subsys_max_lock);
+
+ arizona->subsys_max_rq &= ~mask;
+
+ if (arizona->subsys_max_rq == 0) {
+ switch (arizona->type) {
+ case WM5102:
+ case WM8997:
+ ret = regmap_update_bits(arizona->regmap,
+ ARIZONA_DYNAMIC_FREQUENCY_SCALING_1,
+ ARIZONA_SUBSYS_MAX_FREQ, 0);
+ if (ret != 0)
+ dev_err(arizona->dev,
+ "Failed to disable subsys max (%u)\n",
+ ret);
+
+ ret = regulator_set_voltage(arizona->dcvdd,
+ 1200000, 1800000);
+ if (ret != 0)
+ dev_err(arizona->dev,
+ "Failed to lower dcvdd (%u)\n", ret);
+ break;
+
+ default:
+ break;
+ }
+ }
+
+ mutex_unlock(&arizona->subsys_max_lock);
+ return ret;
+}
+EXPORT_SYMBOL_GPL(arizona_dvfs_down);
+
static irqreturn_t arizona_clkgen_err(int irq, void *data)
{
struct arizona *arizona = data;
@@ -645,6 +728,7 @@ int arizona_dev_init(struct arizona *arizona)
dev_set_drvdata(arizona->dev, arizona);
mutex_init(&arizona->clk_lock);
+ mutex_init(&arizona->subsys_max_lock);
if (dev_get_platdata(arizona->dev))
memcpy(&arizona->pdata, dev_get_platdata(arizona->dev),
diff --git a/include/linux/mfd/arizona/core.h b/include/linux/mfd/arizona/core.h
index 76564af..b4b8a7e 100644
--- a/include/linux/mfd/arizona/core.h
+++ b/include/linux/mfd/arizona/core.h
@@ -132,11 +132,23 @@ struct arizona {
struct mutex clk_lock;
int clk32k_ref;
+ struct mutex subsys_max_lock;
+ unsigned int subsys_max_rq;
+
struct snd_soc_dapm_context *dapm;
};
+#define ARIZONA_DVFS_SR1_RQ 0x00000001
+#define ARIZONA_DVFS_SR2_RQ 0x00000002
+#define ARIZONA_DVFS_SR3_RQ 0x00000004
+#define ARIZONA_DVFS_ASR1_RQ 0x00000010
+#define ARIZONA_DVFS_ASR2_RQ 0x00000020
+#define ARIZONA_DVFS_ADSP1_RQ 0x00010000
+
int arizona_clk32k_enable(struct arizona *arizona);
int arizona_clk32k_disable(struct arizona *arizona);
+int arizona_dvfs_up(struct arizona *arizona, unsigned int mask);
+int arizona_dvfs_down(struct arizona *arizona, unsigned int mask);
int arizona_request_irq(struct arizona *arizona, int irq, char *name,
irq_handler_t handler, void *data);
--
1.7.2.5
--
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