fsl: serdes: ensure accessing the initialized maps of serdes protocol

Up to now, the function is_serdes_configed() doesn't check if the map
of serdes protocol is initialized before accessing it. The function
is_serdes_configed() will get wrong result when it was called before
the serdes protocol maps initialized. As the first element of the map
isn't used for any device, so use it as the flag to indicate if the
map has been initialized.

Signed-off-by: Hou Zhiqiang <Zhiqiang.Hou@nxp.com>
Reviewed-by: York Sun <york.sun@nxp.com>

1 files changed, 19 insertions, 1 deletions

diff --git a/arch/powerpc/cpu/mpc86xx/mpc8641_serdes.c b/arch/powerpc/cpu/mpc86xx/mpc8641_serdes.c
index cc0f8e9..5b12cbd 100644
--- a/arch/powerpc/cpu/mpc86xx/mpc8641_serdes.c
+++ b/arch/powerpc/cpu/mpc86xx/mpc8641_serdes.c
@@ -38,11 +38,19 @@ static u8 serdes2_cfg_tbl[][SRDS2_MAX_LANES] = {
 
 int is_serdes_configured(enum srds_prtcl device)
 {
-	int ret = (1 << device) & serdes1_prtcl_map;
+	int ret;
+
+	if (!(serdes1_prtcl_map & (1 << NONE)))
+		fsl_serdes_init();
+
+	ret = (1 << device) & serdes1_prtcl_map;
 
 	if (ret)
 		return ret;
 
+	if (!(serdes2_prtcl_map & (1 << NONE)))
+		fsl_serdes_init();
+
 	return (1 << device) & serdes2_prtcl_map;
 }
 
@@ -55,6 +63,10 @@ void fsl_serdes_init(void)
 				MPC8641_PORDEVSR_IO_SEL_SHIFT;
 	int lane;
 
+	if (serdes1_prtcl_map & (1 << NONE) &&
+	    serdes2_prtcl_map & (1 << NONE))
+		return;
+
 	debug("PORDEVSR[IO_SEL_SRDS] = %x\n", srds_cfg);
 
 	if (srds_cfg >= ARRAY_SIZE(serdes1_cfg_tbl)) {
@@ -66,6 +78,9 @@ void fsl_serdes_init(void)
 		serdes1_prtcl_map |= (1 << lane_prtcl);
 	}
 
+	/* Set the first bit to indicate serdes has been initialized */
+	serdes1_prtcl_map |= (1 << NONE);
+
 	if (srds_cfg >= ARRAY_SIZE(serdes2_cfg_tbl)) {
 		printf("Invalid PORDEVSR[IO_SEL_SRDS] = %d\n", srds_cfg);
 		return;
@@ -75,4 +90,7 @@ void fsl_serdes_init(void)
 		enum srds_prtcl lane_prtcl = serdes2_cfg_tbl[srds_cfg][lane];
 		serdes2_prtcl_map |= (1 << lane_prtcl);
 	}
+
+	/* Set the first bit to indicate serdes has been initialized */
+	serdes2_prtcl_map |= (1 << NONE);
 }