Re: [PATCH v7 2/3] [media] rc: add sunxi-ir driver

Hi,

On 05/19/2014 10:26 PM, David Härdeman wrote:

On Thu, May 15, 2014 at 03:56:41AM +0600, Alexander Bersenev wrote:

quoted

This patch adds driver for sunxi IR controller.
It is based on Alexsey Shestacov's work based on the original driver
supplied by Allwinner.

...

quoted

+static irqreturn_t sunxi_ir_irq(int irqno, void *dev_id)
+{
+	unsigned long status;
+	unsigned char dt;
+	unsigned int cnt, rc;
+	struct sunxi_ir *ir = dev_id;
+	DEFINE_IR_RAW_EVENT(rawir);
+
+	spin_lock(&ir->ir_lock);
+
+	status = readl(ir->base + SUNXI_IR_RXSTA_REG);
+
+	/* clean all pending statuses */
+	writel(status | REG_RXSTA_CLEARALL, ir->base + SUNXI_IR_RXSTA_REG);
+
+	if (status & REG_RXINT_RAI_EN) {
+		/* How many messages in fifo */
+		rc  = (status >> REG_RXSTA_RAC__SHIFT) & REG_RXSTA_RAC__MASK;
+		/* Sanity check */
+		rc = rc > SUNXI_IR_FIFO_SIZE ? SUNXI_IR_FIFO_SIZE : rc;
+		/* If we have data */
+		for (cnt = 0; cnt < rc; cnt++) {
+			/* for each bit in fifo */
+			dt = readb(ir->base + SUNXI_IR_RXFIFO_REG);
+			rawir.pulse = (dt & 0x80) != 0;
+			rawir.duration = (dt & 0x7f) * SUNXI_IR_SAMPLE;

Can the hardware actually return a zero duration or should that be dt &
0x7f + 1?

(Not familiar with this particular hardware but I know I've seen that
behaviour before).

Good point, I've just checked and the datasheet says the reported pulse
duration can be up to 128, so that would make the range 1-128 not 0-127,
so I believe we indeed need to add 1 to this.

Regards,

Hans


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