[U-Boot] [PATCH] ARM: at91: sama5d2: Wrap cpu detection to fix macb driver

[Alexander Dahl <ada@thorsis.com>]

When introducing the SAMA5D27 SoCs, the SAMA5D2 series got an additional
chip id. The check if the cpu is sama5d2 was changed from a preprocessor
definition (inlining a call to 'get_chip_id()') to a C function,
probably to not call get_chip_id twice?

That however broke a check in the macb ethernet driver. That driver is
more generic and also used for other platforms. I suppose this solution
was implemented to use it in 'gem_is_gigabit_capable()', without having
to stricly depend on the at91 platform:

	#ifndef cpu_is_sama5d2
	#define cpu_is_sama5d2() 0
	#endif

That only works as long as cpu_is_sama5d2 is a preprocessor definition.
(The same is still true for sama5d4 by the way.) So this is a straight
forward fix for the workaround.

The not working check on the SAMA5D2 CPU lead to an issue on a custom
board with a LAN8720A ethernet phy connected to the SoC:

	=> dhcp
	ethernet at f8008000: PHY present at 1
	ethernet at f8008000: Starting autonegotiation...
	ethernet at f8008000: Autonegotiation complete
	ethernet at f8008000: link up, 1000Mbps full-duplex (lpa: 0xffff)
	BOOTP broadcast 1
	BOOTP broadcast 2
	BOOTP broadcast 3
	BOOTP broadcast 4
	BOOTP broadcast 5
	BOOTP broadcast 6
	BOOTP broadcast 7
	BOOTP broadcast 8
	BOOTP broadcast 9
	BOOTP broadcast 10
	BOOTP broadcast 11
	BOOTP broadcast 12
	BOOTP broadcast 13
	BOOTP broadcast 14
	BOOTP broadcast 15
	BOOTP broadcast 16
	BOOTP broadcast 17

	Retry time exceeded; starting again

Notice the wrong reported link speed, although both SoC and phy only
support 100 MBit/s!

The real issue on reliably detecting the features of that cadence
ethernet mac IP block, is probably more complicated, though.

Fixes: 245cbc583db7c1ca52aa32428b8e86f3449d4af2
Signed-off-by: Alexander Dahl <ada@thorsis.com>
---
 arch/arm/mach-at91/armv7/sama5d2_devices.c | 2 +-
 arch/arm/mach-at91/include/mach/sama5d2.h  | 5 ++++-
 2 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/arch/arm/mach-at91/armv7/sama5d2_devices.c b/arch/arm/mach-at91/armv7/sama5d2_devices.c
index 6432f66c82..59a0c44913 100644
--- a/arch/arm/mach-at91/armv7/sama5d2_devices.c
+++ b/arch/arm/mach-at91/armv7/sama5d2_devices.c
@@ -9,7 +9,7 @@
 #include <asm/arch/clk.h>
 #include <asm/arch/sama5d2.h>
 
-int cpu_is_sama5d2(void)
+int _cpu_is_sama5d2(void)
 {
 	unsigned int chip_id = get_chip_id();
 
diff --git a/arch/arm/mach-at91/include/mach/sama5d2.h b/arch/arm/mach-at91/include/mach/sama5d2.h
index 37806cbf34..c7d9bb5ad3 100644
--- a/arch/arm/mach-at91/include/mach/sama5d2.h
+++ b/arch/arm/mach-at91/include/mach/sama5d2.h
@@ -222,6 +222,9 @@
 #define ARCH_EXID_SAMA5D27C_D1G		0x00000033
 #define ARCH_EXID_SAMA5D28C_D1G		0x00000013
 
+/* Checked if defined in ethernet driver macb */
+#define cpu_is_sama5d2	_cpu_is_sama5d2
+
 /* PIT Timer(PIT_PIIR) */
 #define CONFIG_SYS_TIMER_COUNTER	0xf804803c
 
@@ -231,7 +234,7 @@
 #ifndef __ASSEMBLY__
 unsigned int get_chip_id(void);
 unsigned int get_extension_chip_id(void);
-int cpu_is_sama5d2(void);
+int _cpu_is_sama5d2(void);
 unsigned int has_lcdc(void);
 char *get_cpu_name(void);
 #endif
-- 
2.11.0