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path: root/drivers/media/rc/sunxi-cir.c
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Diffstat (limited to 'drivers/media/rc/sunxi-cir.c')
-rw-r--r--drivers/media/rc/sunxi-cir.c19
1 files changed, 11 insertions, 8 deletions
diff --git a/drivers/media/rc/sunxi-cir.c b/drivers/media/rc/sunxi-cir.c
index 97f367b446c4..f500cea228a9 100644
--- a/drivers/media/rc/sunxi-cir.c
+++ b/drivers/media/rc/sunxi-cir.c
@@ -72,12 +72,8 @@
/* CIR_REG register idle threshold */
#define REG_CIR_ITHR(val) (((val) << 8) & (GENMASK(15, 8)))
-/* Required frequency for IR0 or IR1 clock in CIR mode */
+/* Required frequency for IR0 or IR1 clock in CIR mode (default) */
#define SUNXI_IR_BASE_CLK 8000000
-/* Frequency after IR internal divider */
-#define SUNXI_IR_CLK (SUNXI_IR_BASE_CLK / 64)
-/* Sample period in ns */
-#define SUNXI_IR_SAMPLE (1000000000ul / SUNXI_IR_CLK)
/* Noise threshold in samples */
#define SUNXI_IR_RXNOISE 1
/* Idle Threshold in samples */
@@ -122,7 +118,8 @@ static irqreturn_t sunxi_ir_irq(int irqno, void *dev_id)
/* for each bit in fifo */
dt = readb(ir->base + SUNXI_IR_RXFIFO_REG);
rawir.pulse = (dt & 0x80) != 0;
- rawir.duration = ((dt & 0x7f) + 1) * SUNXI_IR_SAMPLE;
+ rawir.duration = ((dt & 0x7f) + 1) *
+ ir->rc->rx_resolution;
ir_raw_event_store_with_filter(ir->rc, &rawir);
}
}
@@ -148,6 +145,7 @@ static int sunxi_ir_probe(struct platform_device *pdev)
struct device_node *dn = dev->of_node;
struct resource *res;
struct sunxi_ir *ir;
+ u32 b_clk_freq = SUNXI_IR_BASE_CLK;
ir = devm_kzalloc(dev, sizeof(struct sunxi_ir), GFP_KERNEL);
if (!ir)
@@ -172,6 +170,9 @@ static int sunxi_ir_probe(struct platform_device *pdev)
return PTR_ERR(ir->clk);
}
+ /* Base clock frequency (optional) */
+ of_property_read_u32(dn, "clock-frequency", &b_clk_freq);
+
/* Reset (optional) */
ir->rst = devm_reset_control_get_optional_exclusive(dev, NULL);
if (IS_ERR(ir->rst))
@@ -180,11 +181,12 @@ static int sunxi_ir_probe(struct platform_device *pdev)
if (ret)
return ret;
- ret = clk_set_rate(ir->clk, SUNXI_IR_BASE_CLK);
+ ret = clk_set_rate(ir->clk, b_clk_freq);
if (ret) {
dev_err(dev, "set ir base clock failed!\n");
goto exit_reset_assert;
}
+ dev_dbg(dev, "set base clock frequency to %d Hz.\n", b_clk_freq);
if (clk_prepare_enable(ir->apb_clk)) {
dev_err(dev, "try to enable apb_ir_clk failed\n");
@@ -225,7 +227,8 @@ static int sunxi_ir_probe(struct platform_device *pdev)
ir->rc->map_name = ir->map_name ?: RC_MAP_EMPTY;
ir->rc->dev.parent = dev;
ir->rc->allowed_protocols = RC_PROTO_BIT_ALL_IR_DECODER;
- ir->rc->rx_resolution = SUNXI_IR_SAMPLE;
+ /* Frequency after IR internal divider with sample period in ns */
+ ir->rc->rx_resolution = (1000000000ul / (b_clk_freq / 64));
ir->rc->timeout = MS_TO_NS(SUNXI_IR_TIMEOUT);
ir->rc->driver_name = SUNXI_IR_DEV;