[PATCH v3] board: freescale: p1_p2_rdb_pc: Fix parsing inverted bits from boot input data

["Pali Rohár" <pali@kernel.org>]

On some boards upper 4 bits of i2c boot input data (register 0) are
inverted. Information which bits are inverted is stored in register 2.

So invert read input data back according to register 2 prior processing
them. This fixes printing "rom_loc: value" line during booting.

Signed-off-by: Pali Rohár <pali@kernel.org>
---
Changes in v3:
* Rebased on top of the U-Boot next branch, commit a87a6fcd20c0e29fe55bfbb6917c4aa1f1bbce74

Changes in v2:
* Use register 2 for detecting which bits needs to be inverted
---
 board/freescale/p1_p2_rdb_pc/p1_p2_rdb_pc.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/board/freescale/p1_p2_rdb_pc/p1_p2_rdb_pc.c b/board/freescale/p1_p2_rdb_pc/p1_p2_rdb_pc.c
index 6665aa4ba94e..d36306f35427 100644
--- a/board/freescale/p1_p2_rdb_pc/p1_p2_rdb_pc.c
+++ b/board/freescale/p1_p2_rdb_pc/p1_p2_rdb_pc.c
@@ -174,7 +174,7 @@ int checkboard(void)
 {
 	struct cpld_data *cpld_data = (void *)(CONFIG_SYS_CPLD_BASE);
 	ccsr_gur_t *gur = (void *)(CONFIG_SYS_MPC85xx_GUTS_ADDR);
-	u8 in, out, io_config, val;
+	u8 in, out, invert, io_config, val;
 	int bus_num = CONFIG_SYS_SPD_BUS_NUM;
 
 	/* FIXME: This should just use the model from the device tree or similar */
@@ -198,6 +198,7 @@ int checkboard(void)
 
 	if (dm_i2c_read(dev, 0, &in, 1) < 0 ||
 	    dm_i2c_read(dev, 1, &out, 1) < 0 ||
+	    dm_i2c_read(dev, 2, &invert, 1) < 0 ||
 	    dm_i2c_read(dev, 3, &io_config, 1) < 0) {
 		printf("Error reading i2c boot information!\n");
 		return 0; /* Don't want to hang() on this error */
@@ -207,13 +208,14 @@ int checkboard(void)
 
 	if (i2c_read(CONFIG_SYS_I2C_PCA9557_ADDR, 0, 1, &in, 1) < 0 ||
 	    i2c_read(CONFIG_SYS_I2C_PCA9557_ADDR, 1, 1, &out, 1) < 0 ||
+	    i2c_read(CONFIG_SYS_I2C_PCA9557_ADDR, 2, 1, &invert, 1) < 0 ||
 	    i2c_read(CONFIG_SYS_I2C_PCA9557_ADDR, 3, 1, &io_config, 1) < 0) {
 		printf("Error reading i2c boot information!\n");
 		return 0; /* Don't want to hang() on this error */
 	}
 	#endif
 
-	val = (in & io_config) | (out & (~io_config));
+	val = ((in ^ invert) & io_config) | (out & (~io_config));
 
 	puts("rom_loc: ");
 	if ((val & (~__SW_BOOT_MASK)) == __SW_BOOT_SD) {
-- 
2.20.1