[U-Boot] [PATCH] sunxi: Fix gmac not working reliable on the Bananapi

[Hans de Goede]

In order for the gmac nic to work reliable on the Bananapi, we need to poke
these 2 undocumented bits in the gmac clk register. Since these are
undocumented, this commit only sets these bits on the Bananapi for now.

I'll contact Allwinner to try and get these bits documented, once they
are documented we can hopefully replace this hack with a better patch.

Reported-by: Karsten Merker <merker at debian.org>
Signed-off-by: Hans de Goede <hdegoede at redhat.com>
---
 board/sunxi/gmac.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/board/sunxi/gmac.c b/board/sunxi/gmac.c
index e7ff952..f58c963 100644
--- a/board/sunxi/gmac.c
+++ b/board/sunxi/gmac.c
@@ -24,6 +24,15 @@ int sunxi_gmac_initialize(bd_t *bis)
 		CCM_GMAC_CTRL_GPIT_MII);
 #endif
 
+	/*
+	 * HdG: this is necessary to get GMAC to work reliable on the
+	 * Bananapi. We don't know what these undocumented bits do, so this
+	 * is a Bananapi specific hack for now.
+	 */
+#ifdef CONFIG_BANANAPI
+	setbits_le32(&ccm->gmac_clk_cfg, 0x3 << 10);
+#endif
+
 	/* Configure pin mux settings for GMAC */
 	for (pin = SUNXI_GPA(0); pin <= SUNXI_GPA(16); pin++) {
 #ifdef CONFIG_RGMII
-- 
2.1.0