From: Chris Packham <judge.packham@gmail.com>
To: u-boot@lists.denx.de
Subject: [PATCH 2/2] mv_ddr: ddr3: Update {min,max}_read_sample calculation
Date: Wed, 27 May 2020 13:31:30 +1200 [thread overview]
Message-ID: <20200527013131.1663-3-judge.packham@gmail.com> (raw)
In-Reply-To: <20200527013131.1663-1-judge.packham@gmail.com>
From: Chris Packham <chris.packham@alliedtelesis.co.nz>
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 <chris.packham@alliedtelesis.co.nz>
[upstream https://github.com/MarvellEmbeddedProcessors/mv-ddr-marvell/pull/22]
Signed-off-by: Chris Packham <judge.packham@gmail.com>
---
drivers/ddr/marvell/a38x/ddr3_training_hw_algo.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/ddr/marvell/a38x/ddr3_training_hw_algo.c b/drivers/ddr/marvell/a38x/ddr3_training_hw_algo.c
index ce9a47fc2ce0..58ffb205072e 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)
--
2.25.1
next prev parent reply other threads:[~2020-05-27 1:31 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-05-27 1:31 [PATCH 0/2] mvebu: ddr3: Armada-385 read ODT configuration Chris Packham
2020-05-27 1:31 ` [PATCH 1/2] mv_ddr: ddr3: Use correct bitmask for read sample delay Chris Packham
2020-05-27 5:41 ` Stefan Roese
2020-05-27 1:31 ` Chris Packham [this message]
2020-05-27 4:50 ` [PATCH 2/2] mv_ddr: ddr3: Update {min, max}_read_sample calculation Baruch Siach
2020-05-27 5:41 ` [PATCH 2/2] mv_ddr: ddr3: Update {min,max}_read_sample calculation Stefan Roese
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20200527013131.1663-3-judge.packham@gmail.com \
--to=judge.packham@gmail.com \
--cc=u-boot@lists.denx.de \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.