From: Vitor Soares <vitor.soares@synopsys.com>
To: linux-i3c@lists.infradead.org
Cc: joao.pinto@synopsys.com, Boris Brezillon <bbrezillon@kernel.org>,
linux-kernel@vger.kernel.org,
Vitor Soares <vitor.soares@synopsys.com>
Subject: [PATCH 2/3] i3c: add mixed limited bus mode
Date: Mon, 15 Apr 2019 20:46:42 +0200 [thread overview]
Message-ID: <a3bf32dadd9b0135442526cc77fec5726e6e617d.1555350118.git.vitor.soares@synopsys.com> (raw)
In-Reply-To: <cover.1555350118.git.vitor.soares@synopsys.com>
In-Reply-To: <cover.1555350118.git.vitor.soares@synopsys.com>
The i3c bus spec define a bus configuration where the i2c devices
doesn't have the 50ns filter yet they allow the SDR max speed.
This patch introduce the limited bus mode so the users can use
a higher speed on presence of i2c devices index 1.
Signed-off-by: Vitor Soares <vitor.soares@synopsys.com>
Cc: Boris Brezillon <bbrezillon@kernel.org>
Cc: <linux-kernel@vger.kernel.org>
---
drivers/i3c/master.c | 5 +++++
include/linux/i3c/master.h | 5 +++++
2 files changed, 10 insertions(+)
diff --git a/drivers/i3c/master.c b/drivers/i3c/master.c
index 1c4a86a..46d3774 100644
--- a/drivers/i3c/master.c
+++ b/drivers/i3c/master.c
@@ -463,6 +463,7 @@ static int i3c_bus_init(struct i3c_bus *i3cbus)
static const char * const i3c_bus_mode_strings[] = {
[I3C_BUS_MODE_PURE] = "pure",
[I3C_BUS_MODE_MIXED_FAST] = "mixed-fast",
+ [I3C_BUS_MODE_MIXED_LIMITED] = "mixed-limited",
[I3C_BUS_MODE_MIXED_SLOW] = "mixed-slow",
};
@@ -575,6 +576,7 @@ int i3c_bus_set_mode(struct i3c_bus *i3cbus, enum i3c_bus_mode mode,
i3cbus->scl_rate.i3c = I3C_BUS_TYP_I3C_SCL_RATE;
break;
case I3C_BUS_MODE_MIXED_FAST:
+ case I3C_BUS_MODE_MIXED_LIMITED:
if (!i3cbus->scl_rate.i3c)
i3cbus->scl_rate.i3c = I3C_BUS_TYP_I3C_SCL_RATE;
if (!i3cbus->scl_rate.i2c)
@@ -2481,6 +2483,9 @@ int i3c_master_register(struct i3c_master_controller *master,
mode = I3C_BUS_MODE_MIXED_FAST;
break;
case I3C_LVR_I2C_INDEX(1):
+ if (mode < I3C_BUS_MODE_MIXED_LIMITED)
+ mode = I3C_BUS_MODE_MIXED_LIMITED;
+ break;
case I3C_LVR_I2C_INDEX(2):
if (mode < I3C_BUS_MODE_MIXED_SLOW)
mode = I3C_BUS_MODE_MIXED_SLOW;
diff --git a/include/linux/i3c/master.h b/include/linux/i3c/master.h
index 44fb3cf..740235e 100644
--- a/include/linux/i3c/master.h
+++ b/include/linux/i3c/master.h
@@ -250,12 +250,17 @@ struct i3c_device {
* the bus. The only impact in this mode is that the
* high SCL pulse has to stay below 50ns to trick I2C
* devices when transmitting I3C frames
+ * @I3C_BUS_MODE_MIXED_LIMITED: I2C devices without 50ns spike filter are
+ * present on the bus. However they allows
+ * compliance up to the maximum SDR SCL clock
+ * frequency.
* @I3C_BUS_MODE_MIXED_SLOW: I2C devices without 50ns spike filter are present
* on the bus
*/
enum i3c_bus_mode {
I3C_BUS_MODE_PURE,
I3C_BUS_MODE_MIXED_FAST,
+ I3C_BUS_MODE_MIXED_LIMITED,
I3C_BUS_MODE_MIXED_SLOW,
};
--
2.7.4
_______________________________________________
linux-i3c mailing list
linux-i3c@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-i3c
next prev parent reply other threads:[~2019-04-15 18:46 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-04-15 18:46 [PATCH 0/3] Fix i2c and i3c scl rate according bus mode Vitor Soares
2019-04-15 18:46 ` [PATCH 1/3] i3c: fix i2c and i3c scl rate by " Vitor Soares
2019-04-16 5:50 ` Boris Brezillon
2019-04-16 14:24 ` Vitor Soares
2019-04-16 14:52 ` Boris Brezillon
2019-04-22 15:54 ` Vitor Soares
2019-04-22 16:07 ` Boris Brezillon
2019-04-22 17:54 ` Vitor Soares
2019-04-22 18:27 ` Boris Brezillon
2019-04-22 19:59 ` Vitor Soares
2019-04-15 18:46 ` Vitor Soares [this message]
2019-04-16 6:00 ` [PATCH 2/3] i3c: add mixed limited " Boris Brezillon
2019-04-16 14:27 ` Vitor Soares
2019-04-15 18:46 ` [PATCH 3/3] i3c: dw: Add limited bus mode support Vitor Soares
2019-04-16 6:09 ` Boris Brezillon
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=a3bf32dadd9b0135442526cc77fec5726e6e617d.1555350118.git.vitor.soares@synopsys.com \
--to=vitor.soares@synopsys.com \
--cc=bbrezillon@kernel.org \
--cc=joao.pinto@synopsys.com \
--cc=linux-i3c@lists.infradead.org \
--cc=linux-kernel@vger.kernel.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).