static int xilinx_spi_write_complete()

in xilinx-spi.c [169:214]

• 33 lines of code
• 8 McCabe index (conditional complexity)

static int xilinx_spi_write_complete(struct fpga_manager *mgr,
				     struct fpga_image_info *info)
{
	struct xilinx_spi_conf *conf = mgr->priv;
	unsigned long timeout = jiffies + usecs_to_jiffies(info->config_complete_timeout_us);
	bool expired = false;
	int done;
	int ret;

	/*
	 * This loop is carefully written such that if the driver is
	 * scheduled out for more than 'timeout', we still check for DONE
	 * before giving up and we apply 8 extra CCLK cycles in all cases.
	 */
	while (!expired) {
		expired = time_after(jiffies, timeout);

		done = get_done_gpio(mgr);
		if (done < 0)
			return done;

		ret = xilinx_spi_apply_cclk_cycles(conf);
		if (ret)
			return ret;

		if (done)
			return 0;
	}

	if (conf->init_b) {
		ret = gpiod_get_value(conf->init_b);

		if (ret < 0) {
			dev_err(&mgr->dev, "Error reading INIT_B (%d)\n", ret);
			return ret;
		}

		dev_err(&mgr->dev,
			ret ? "CRC error or invalid device\n"
			: "Missing sync word or incomplete bitstream\n");
	} else {
		dev_err(&mgr->dev, "Timeout after config data transfer\n");
	}

	return -ETIMEDOUT;
}