[U-Boot] [PATCH v2] armv8: fsl-layerscape: reorder rgmii dpmacs' enablement

[Pankaj Bansal]

some dpmacs in armv8a based freescale layerscape SOCs can be
configured via both serdes(sgmii, xfi, xlaui etc) bits and via
EC*_PMUX(rgmii) bits in RCW.
e.g. dpmac 17 and 18 in LX2160A can be configured as SGMII from
serdes bits and as RGMII via EC1_PMUX/EC2_PMUX bits
Now if a dpmac is enabled by serdes bits then it takes precedence
over EC*_PMUX bits. i.e. in LX2160A if we select serdes protocol
that configures dpmac17 as SGMII and set the EC1_PMUX as RGMII,
then the dpmac is SGMII and not RGMII.

Therefore, move the fsl_rgmii_init after fsl_serdes_init. in
fsl_rgmii_init function of SOC, we will check if the dpmac is enabled
or not? if it is (fsl_serdes_init has already enabled the dpmac), then
don't enable it.

Signed-off-by: Pankaj Bansal <pankaj.bansal at nxp.com>
---

Notes:
    V2:
    - as per review comments, add commit message as inline comments.

 arch/arm/cpu/armv8/fsl-layerscape/cpu.c | 22 ++++++++++++++++++----
 1 file changed, 18 insertions(+), 4 deletions(-)

diff --git a/arch/arm/cpu/armv8/fsl-layerscape/cpu.c b/arch/arm/cpu/armv8/fsl-layerscape/cpu.c
index 052e0708d4..3fe7f885e8 100644
--- a/arch/arm/cpu/armv8/fsl-layerscape/cpu.c
+++ b/arch/arm/cpu/armv8/fsl-layerscape/cpu.c
@@ -553,15 +553,29 @@ int arch_early_init_r(void)
 			printf("Did not wake secondary cores\n");
 	}
 
-#ifdef CONFIG_SYS_FSL_HAS_RGMII
-	fsl_rgmii_init();
-#endif
-
 	config_core_prefetch();
 
 #ifdef CONFIG_SYS_HAS_SERDES
 	fsl_serdes_init();
 #endif
+#ifdef CONFIG_SYS_FSL_HAS_RGMII
+	/* some dpmacs in armv8a based freescale layerscape SOCs can be
+	 * configured via both serdes(sgmii, xfi, xlaui etc) bits and via
+	 * EC*_PMUX(rgmii) bits in RCW.
+	 * e.g. dpmac 17 and 18 in LX2160A can be configured as SGMII from
+	 * serdes bits and as RGMII via EC1_PMUX/EC2_PMUX bits
+	 * Now if a dpmac is enabled by serdes bits then it takes precedence
+	 * over EC*_PMUX bits. i.e. in LX2160A if we select serdes protocol
+	 * that configures dpmac17 as SGMII and set the EC1_PMUX as RGMII,
+	 * then the dpmac is SGMII and not RGMII.
+	 *
+	 * Therefore, move the fsl_rgmii_init after fsl_serdes_init. in
+	 * fsl_rgmii_init function of SOC, we will check if the dpmac is enabled
+	 * or not? if it is (fsl_serdes_init has already enabled the dpmac),
+	 * then don't enable it.
+	 */
+	fsl_rgmii_init();
+#endif
 #ifdef CONFIG_FMAN_ENET
 	fman_enet_init();
 #endif
-- 
2.17.1