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authorDirk Eibach <dirk.eibach@gdsys.cc>2015-10-28 11:46:27 +0100
committerTom Rini <trini@konsulko.com>2015-11-12 15:59:03 -0500
commitd054c2f8c6af6df672bbbb524252c4f5c1d4bf45 (patch)
tree6a1056bdbb3e9a5ab335ba704f7b8eaed6715529 /board/gdsys
parent2302fd32a5c2015be204e71737481322fe7b5f3a (diff)
downloadblackbird-obmc-uboot-d054c2f8c6af6df672bbbb524252c4f5c1d4bf45.tar.gz
blackbird-obmc-uboot-d054c2f8c6af6df672bbbb524252c4f5c1d4bf45.zip
board: gdsys: Consider DP501 limits on link training
DP501 only supports DP 1.1a. Limit settings for link bandwidth and lane count to values allowed by DP 1.1a. Signed-off-by: Dirk Eibach <dirk.eibach@gdsys.cc>
Diffstat (limited to 'board/gdsys')
-rw-r--r--board/gdsys/common/dp501.c22
1 files changed, 20 insertions, 2 deletions
diff --git a/board/gdsys/common/dp501.c b/board/gdsys/common/dp501.c
index 0389fd1750..d35aee0879 100644
--- a/board/gdsys/common/dp501.c
+++ b/board/gdsys/common/dp501.c
@@ -40,11 +40,29 @@ static int dp501_detect_cable_adapter(u8 addr)
static void dp501_link_training(u8 addr)
{
u8 val;
+ u8 link_bw;
+ u8 max_lane_cnt;
+ u8 lane_cnt;
val = i2c_reg_read(addr, 0x51);
- i2c_reg_write(addr, 0x5d, val); /* set link_bw */
+ if (val >= 0x0a)
+ link_bw = 0x0a;
+ else
+ link_bw = 0x06;
+ if (link_bw != val)
+ printf("DP sink supports %d Mbps link rate, set to %d Mbps\n",
+ val * 270, link_bw * 270);
+ i2c_reg_write(addr, 0x5d, link_bw); /* set link_bw */
val = i2c_reg_read(addr, 0x52);
- i2c_reg_write(addr, 0x5e, val); /* set lane_cnt */
+ max_lane_cnt = val & 0x1f;
+ if (max_lane_cnt >= 4)
+ lane_cnt = 4;
+ else
+ lane_cnt = max_lane_cnt;
+ if (lane_cnt != max_lane_cnt)
+ printf("DP sink supports %d lanes, set to %d lanes\n",
+ max_lane_cnt, lane_cnt);
+ i2c_reg_write(addr, 0x5e, lane_cnt | (val & 0x80)); /* set lane_cnt */
val = i2c_reg_read(addr, 0x53);
i2c_reg_write(addr, 0x5c, val); /* set downspread_ctl */
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