From: Chris Packham Date: Wed, 27 May 2020 01:31:30 +0000 (+1200) Subject: mv_ddr: ddr3: Update {min,max}_read_sample calculation X-Git-Url: http://git.dujemihanovic.xyz/img/sics.gif?a=commitdiff_plain;h=485dbd3f1088c091c32138845f2f645d51d00667;p=u-boot.git mv_ddr: ddr3: Update {min,max}_read_sample calculation Measurements on actual hardware shown that the read ODT is early by 3 clocks. Adjust the calculation to avoid this. Signed-off-by: Chris Packham [upstream https://github.com/MarvellEmbeddedProcessors/mv-ddr-marvell/pull/22] Signed-off-by: Chris Packham Tested-by: Baruch Siach Reviewed-by: Stefan Roese --- diff --git a/drivers/ddr/marvell/a38x/ddr3_training_hw_algo.c b/drivers/ddr/marvell/a38x/ddr3_training_hw_algo.c index ce9a47fc2c..58ffb20507 100644 --- a/drivers/ddr/marvell/a38x/ddr3_training_hw_algo.c +++ b/drivers/ddr/marvell/a38x/ddr3_training_hw_algo.c @@ -91,8 +91,8 @@ int ddr3_tip_write_additional_odt_setting(u32 dev_num, u32 if_id) min_read_sample = read_sample[cs_num]; } - min_read_sample = min_read_sample - 1; - max_read_sample = max_read_sample + 4 + (max_phase + 1) / 2 + 1; + min_read_sample = min_read_sample + 2; + max_read_sample = max_read_sample + 7 + (max_phase + 1) / 2 + 1; if (min_read_sample >= 0xf) min_read_sample = 0xf; if (max_read_sample >= 0x1f)