From: pierre-yves.mordret@st.com (Pierre-Yves MORDRET)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH v1 1/2] dmaengine: stm32-mdma: align TLEN and buffer length on burst
Date: Tue, 13 Mar 2018 18:16:05 +0100 [thread overview]
Message-ID: <1520961366-27473-2-git-send-email-pierre-yves.mordret@st.com> (raw)
In-Reply-To: <1520961366-27473-1-git-send-email-pierre-yves.mordret@st.com>
Both buffer Transfer Length (TLEN if any) and transfer size have to be
aligned on burst size (burst beats*bus width).
Signed-off-by: Pierre-Yves MORDRET <pierre-yves.mordret@st.com>
---
Version history:
v1:
* Initial
---
---
drivers/dma/stm32-mdma.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/dma/stm32-mdma.c b/drivers/dma/stm32-mdma.c
index daa1602..fbcffa2 100644
--- a/drivers/dma/stm32-mdma.c
+++ b/drivers/dma/stm32-mdma.c
@@ -413,7 +413,7 @@ static u32 stm32_mdma_get_best_burst(u32 buf_len, u32 tlen, u32 max_burst,
u32 best_burst = max_burst;
u32 burst_len = best_burst * width;
- while ((burst_len > 0) && (tlen % burst_len)) {
+ while ((burst_len > 0) && (((tlen | buf_len) & (burst_len - 1)) != 0)) {
best_burst = best_burst >> 1;
burst_len = best_burst * width;
}
--
2.7.4
next prev parent reply other threads:[~2018-03-13 17:16 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-03-13 17:16 [PATCH v1 0/2] Append some fixes and improvements Pierre-Yves MORDRET
2018-03-13 17:16 ` Pierre-Yves MORDRET [this message]
2018-03-13 17:16 ` [PATCH v1 2/2] dmaengine: stm32-mdma: Fix incomplete Hw descriptors allocator Pierre-Yves MORDRET
2018-03-16 10:39 ` kbuild test robot
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=1520961366-27473-2-git-send-email-pierre-yves.mordret@st.com \
--to=pierre-yves.mordret@st.com \
--cc=linux-arm-kernel@lists.infradead.org \
/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 a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).