From: Sowjanya Komatineni <skomatineni@nvidia.com>
To: <skomatineni@nvidia.com>, <thierry.reding@gmail.com>,
<jonathanh@nvidia.com>, <frankc@nvidia.com>, <hverkuil@xs4all.nl>,
<sakari.ailus@iki.fi>, <robh+dt@kernel.org>,
<helen.koike@collabora.com>
Cc: <digetx@gmail.com>, <sboyd@kernel.org>,
<gregkh@linuxfoundation.org>, <linux-media@vger.kernel.org>,
<devicetree@vger.kernel.org>, <linux-tegra@vger.kernel.org>,
<linux-kernel@vger.kernel.org>, <linux-i2c@vger.kernel.org>
Subject: [RFC PATCH v4 04/14] i2c: tegra: Fix runtime resume to re-init VI I2C
Date: Thu, 23 Jul 2020 16:51:02 -0700 [thread overview]
Message-ID: <1595548272-9809-5-git-send-email-skomatineni@nvidia.com> (raw)
In-Reply-To: <1595548272-9809-1-git-send-email-skomatineni@nvidia.com>
VI I2C is on host1x bus and is part of VE power domain.
During suspend/resume VE power domain goes through power off/on.
So, controller reset followed by i2c re-initialization is required
after the domain power up.
This patch fixes it.
Signed-off-by: Sowjanya Komatineni <skomatineni@nvidia.com>
---
drivers/i2c/busses/i2c-tegra.c | 16 ++++++++++++++++
1 file changed, 16 insertions(+)
diff --git a/drivers/i2c/busses/i2c-tegra.c b/drivers/i2c/busses/i2c-tegra.c
index 7b93c45..1bf3666 100644
--- a/drivers/i2c/busses/i2c-tegra.c
+++ b/drivers/i2c/busses/i2c-tegra.c
@@ -293,6 +293,8 @@ struct tegra_i2c_dev {
bool is_curr_atomic_xfer;
};
+static int tegra_i2c_init(struct tegra_i2c_dev *i2c_dev, bool clk_reinit);
+
static void dvc_writel(struct tegra_i2c_dev *i2c_dev, u32 val,
unsigned long reg)
{
@@ -675,8 +677,22 @@ static int __maybe_unused tegra_i2c_runtime_resume(struct device *dev)
goto disable_slow_clk;
}
+ /*
+ * VI I2C device is attached to VE power domain which goes through
+ * power ON/OFF during PM runtime resume/suspend. So, controller
+ * should go through reset and need to re-initialize after power
+ * domain ON.
+ */
+ if (i2c_dev->is_vi) {
+ ret = tegra_i2c_init(i2c_dev, true);
+ if (ret)
+ goto disable_div_clk;
+ }
+
return 0;
+disable_div_clk:
+ clk_disable(i2c_dev->div_clk);
disable_slow_clk:
clk_disable(i2c_dev->slow_clk);
disable_fast_clk:
--
2.7.4
next prev parent reply other threads:[~2020-07-23 23:49 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-07-23 23:50 [RFC PATCH v4 00/14] Support for Tegra video capture from external sensor Sowjanya Komatineni
2020-07-23 23:50 ` [RFC PATCH v4 01/14] i2c: tegra: Don't mark VI I2C as IRQ safe runtime PM Sowjanya Komatineni
2020-07-26 23:30 ` Dmitry Osipenko
2020-07-23 23:51 ` [RFC PATCH v4 02/14] i2c: tegra: Remove NULL pointer check before clk_enable/disable/prepare/unprepare Sowjanya Komatineni
2020-07-23 23:51 ` [RFC PATCH v4 03/14] i2c: tegra: Fix the error path in tegra_i2c_runtime_resume Sowjanya Komatineni
2020-07-26 23:41 ` Dmitry Osipenko
2020-07-23 23:51 ` Sowjanya Komatineni [this message]
2020-07-26 23:53 ` [RFC PATCH v4 04/14] i2c: tegra: Fix runtime resume to re-init VI I2C Dmitry Osipenko
2020-07-27 20:58 ` Sowjanya Komatineni
2020-07-23 23:51 ` [RFC PATCH v4 05/14] i2c: tegra: Avoid tegra_i2c_init_dma() for Tegra210 vi i2c Sowjanya Komatineni
2020-07-26 23:57 ` Dmitry Osipenko
2020-07-23 23:51 ` [RFC PATCH v4 06/14] media: tegra-video: Fix channel format alignment Sowjanya Komatineni
2020-07-23 23:51 ` [RFC PATCH v4 07/14] media: tegra-video: Enable TPG based on kernel config Sowjanya Komatineni
2020-07-23 23:51 ` [RFC PATCH v4 08/14] media: tegra-video: Update format lookup to offset based Sowjanya Komatineni
2020-07-23 23:51 ` [RFC PATCH v4 09/14] dt-bindings: tegra: Update VI and CSI bindings with port info Sowjanya Komatineni
2020-07-23 23:51 ` [RFC PATCH v4 10/14] media: tegra-video: Add support for external sensor capture Sowjanya Komatineni
2020-07-23 23:51 ` [RFC PATCH v4 11/14] media: tegra-video: Add support for selection ioctl ops Sowjanya Komatineni
2020-07-23 23:51 ` [RFC PATCH v4 12/14] gpu: host1x: mipi: Keep MIPI clock enabled till calibration is done Sowjanya Komatineni
2020-07-27 0:10 ` Dmitry Osipenko
2020-07-23 23:51 ` [RFC PATCH v4 13/14] media: tegra-video: Add CSI MIPI pads calibration Sowjanya Komatineni
2020-07-23 23:51 ` [RFC PATCH v4 14/14] media: tegra-video: Compute settle times based on the clock rate Sowjanya Komatineni
2020-07-24 9:43 ` [RFC PATCH v4 00/14] Support for Tegra video capture from external sensor Hans Verkuil
2020-07-24 19:16 ` Wolfram Sang
2020-07-27 0:25 ` Dmitry Osipenko
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=1595548272-9809-5-git-send-email-skomatineni@nvidia.com \
--to=skomatineni@nvidia.com \
--cc=devicetree@vger.kernel.org \
--cc=digetx@gmail.com \
--cc=frankc@nvidia.com \
--cc=gregkh@linuxfoundation.org \
--cc=helen.koike@collabora.com \
--cc=hverkuil@xs4all.nl \
--cc=jonathanh@nvidia.com \
--cc=linux-i2c@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-media@vger.kernel.org \
--cc=linux-tegra@vger.kernel.org \
--cc=robh+dt@kernel.org \
--cc=sakari.ailus@iki.fi \
--cc=sboyd@kernel.org \
--cc=thierry.reding@gmail.com \
/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).