From: Marek Behún Date: Thu, 17 Feb 2022 00:08:37 +0000 (+0100) Subject: ddr: marvell: a38x: fix BYTE_HOMOGENEOUS_SPLIT_OUT decision X-Git-Url: http://git.dujemihanovic.xyz/?a=commitdiff_plain;h=a163db9fbaa9004bc461d8b1c6b648c674c25f09;p=u-boot.git ddr: marvell: a38x: fix BYTE_HOMOGENEOUS_SPLIT_OUT decision In commit 3fc92a215b69 ("ddr: marvell: a38x: fix SPLIT_OUT_MIX state decision") I ported a cleaned up and changed version of patch mv_ddr: a380: fix SPLIT_OUT_MIX state decision In the port we removed checking for BYTE_HOMOGENEOUS_SPLIT_OUT bit, because: - the fix seemed to work without it - the bit was checked for only at one place out of two, while the second bit, BYTE_SPLIT_OUT_MIX, was checked for in both cases - without the removal it didn't work on Allied Telesis' x530 board We recently had a chance to test on more boards, and it seems that the change needs to be opposite: instead of removing the check for BYTE_HOMOGENEOUS_SPLIT_OUT from the first if() statement, the check needs to be added also to the second one - it needs to be at both places. With this change all the Turris Omnia boards I have had available to test seem to work, I didn't encounter not even one failed DDR training. As last time, I am noting that I do not understand what this code is actually doing, I haven't studied the DDR training algorithm and I suspect that no one will be able to explain it to U-Boot contributors, so we are left with this blind poking in the code with testing whether it works on several boards and hoping it doesn't break anything for anyone :-(. Signed-off-by: Marek Behún Tested-by: Chris Packham Reviewed-by: Stefan Roese --- diff --git a/drivers/ddr/marvell/a38x/ddr3_training_centralization.c b/drivers/ddr/marvell/a38x/ddr3_training_centralization.c index 42308b6965..be9f985f22 100644 --- a/drivers/ddr/marvell/a38x/ddr3_training_centralization.c +++ b/drivers/ddr/marvell/a38x/ddr3_training_centralization.c @@ -180,7 +180,8 @@ static int ddr3_tip_centralization(u32 dev_num, u32 mode) [bit_id], EDGE_1); if (current_byte_status & - BYTE_SPLIT_OUT_MIX) { + (BYTE_SPLIT_OUT_MIX | + BYTE_HOMOGENEOUS_SPLIT_OUT)) { if (cur_start_win[bit_id] >= 64) cur_start_win[bit_id] -= 64; else @@ -197,7 +198,8 @@ static int ddr3_tip_centralization(u32 dev_num, u32 mode) EDGE_1); if (cur_end_win[bit_id] >= 64 && (current_byte_status & - BYTE_SPLIT_OUT_MIX)) { + (BYTE_SPLIT_OUT_MIX | + BYTE_HOMOGENEOUS_SPLIT_OUT))) { cur_end_win[bit_id] -= 64; DEBUG_CENTRALIZATION_ENGINE (DEBUG_LEVEL_INFO,