Edward O'Callaghan has uploaded this change for review.

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realtek_mst_i2c_spi.c: Introduce MCU reset param

Modify the spi master as to not automatically reset the
MCU unless explicitly stated by a param.

Change-Id: Ib70bf7399e7541f30b6905cdb950a6fb7b74ae18
Signed-off-by: Edward O'Callaghan <quasisec@google.com>
---
M realtek_mst_i2c_spi.c
1 file changed, 15 insertions(+), 5 deletions(-)

git pull ssh://review.coreboot.org:29418/flashrom refs/changes/74/45674/1

diff --git a/realtek_mst_i2c_spi.c b/realtek_mst_i2c_spi.c
index 6158524..6ac57d5 100644
--- a/realtek_mst_i2c_spi.c
+++ b/realtek_mst_i2c_spi.c
@@ -49,6 +49,7 @@
 
 struct realtek_mst_i2c_spi_data {
 	int fd;
+	int reset;
 };
 
 static int realtek_mst_i2c_spi_write_data(int fd, uint16_t addr, void *buf, uint16_t len)
@@ -392,14 +393,15 @@
         struct realtek_mst_i2c_spi_data *realtek_mst_data =
 		(struct realtek_mst_i2c_spi_data *)data;
 	int fd = realtek_mst_data->fd;
-	ret |= realtek_mst_i2c_spi_reset_mpu(fd);
+	if (data->reset)
+		ret |= realtek_mst_i2c_spi_reset_mpu(fd);
 	i2c_close(fd);
 	free(data);
 
 	return ret;
 }
 
-static int get_params(int *i2c_bus)
+static int get_params(int *i2c_bus, int *reset)
 {
 	char *bus_str = NULL;
         int ret = SPI_GENERIC_ERROR;
@@ -431,6 +433,12 @@
 	} else {
 		msg_perr("%s: Bus number not specified.\n", __func__);
 	}
+
+	reset_str = extract_programmer_param("reset-mcu");
+	if (reset_str && reset_str[0] == '1')
+		reset = 1;
+	free(reset_str);
+
 get_params_done:
 	if (bus_str)
 		free(bus_str);
@@ -441,9 +449,9 @@
 int realtek_mst_i2c_spi_init(void)
 {
 	int ret = 0;
-	int i2c_bus = 0;
+	int i2c_bus = 0, reset = 0;
 
-	if (get_params(&i2c_bus))
+	if (get_params(&i2c_bus, &reset))
 		return SPI_GENERIC_ERROR;
 
 	int fd = i2c_open(i2c_bus, REGISTER_ADDRESS, 0);
@@ -451,7 +459,8 @@
 		return fd;
 
 	/* Ensure we are in a known state before entering ISP mode */
-	ret |= realtek_mst_i2c_spi_reset_mpu(fd);
+	if (reset)
+		ret |= realtek_mst_i2c_spi_reset_mpu(fd);
 	if (ret)
 		return ret;
 
@@ -466,6 +475,7 @@
 	}
 
 	data->fd = fd;
+	data->reset = reset;
 	ret |= register_shutdown(realtek_mst_i2c_spi_shutdown, data);
 
 	spi_master_i2c_realtek_mst.data = data;

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