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 v1 05/18] i2c: tegra: Fix runtime resume to re-init VI I2C
Date: Tue, 9 Jun 2020 23:02:27 -0700 [thread overview]
Message-ID: <1591768960-31648-6-git-send-email-skomatineni@nvidia.com> (raw)
In-Reply-To: <1591768960-31648-1-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 dba38a5..650240d 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)
{
@@ -679,8 +681,22 @@ 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:
if (i2c_dev->slow_clk)
clk_disable(i2c_dev->slow_clk);
--
2.7.4
next prev parent reply other threads:[~2020-06-10 6:04 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-06-10 6:02 [RFC PATCH v1 00/18] Support for Tegra video capture from external sensor Sowjanya Komatineni
2020-06-10 6:02 ` [RFC PATCH v1 01/18] dt-bindings: i2c: tegra: Document Tegra210 VI I2C clocks and power-domains Sowjanya Komatineni
2020-06-10 6:02 ` [RFC PATCH v1 02/18] arm64: tegra: Add missing clocks and power-domains to Tegra210 VI I2C Sowjanya Komatineni
2020-06-10 6:02 ` [RFC PATCH v1 03/18] i2c: tegra: Don't mark VI I2C as IRQ safe runtime PM Sowjanya Komatineni
2020-06-10 6:02 ` [RFC PATCH v1 04/18] i2c: tegra: Fix the error path in tegra_i2c_runtime_resume Sowjanya Komatineni
2020-06-10 6:02 ` Sowjanya Komatineni [this message]
2020-06-10 13:14 ` [RFC PATCH v1 05/18] i2c: tegra: Fix runtime resume to re-init VI I2C Dmitry Osipenko
2020-06-10 16:58 ` Sowjanya Komatineni
2020-06-10 6:02 ` [RFC PATCH v1 06/18] i2c: tegra: Avoid tegra_i2c_init_dma() for Tegra210 vi i2c Sowjanya Komatineni
2020-06-10 6:02 ` [RFC PATCH v1 07/18] media: tegra-video: Fix channel format alignment Sowjanya Komatineni
2020-06-10 6:02 ` [RFC PATCH v1 08/18] media: tegra-video: Enable TPG based on kernel config Sowjanya Komatineni
2020-06-10 6:02 ` [RFC PATCH v1 09/18] media: tegra-video: Update format lookup to offset based Sowjanya Komatineni
2020-06-10 6:02 ` [RFC PATCH v1 10/18] dt-bindings: tegra: Document VI and CSI port nodes Sowjanya Komatineni
2020-06-10 11:23 ` Sakari Ailus
2020-06-10 15:15 ` Sowjanya Komatineni
2020-06-10 21:11 ` Sowjanya Komatineni
2020-06-17 22:14 ` Rob Herring
2020-06-18 10:50 ` Thierry Reding
2020-06-10 6:02 ` [RFC PATCH v1 11/18] media: tegra-video: Add support for external sensor capture Sowjanya Komatineni
2020-06-10 6:02 ` [RFC PATCH v1 12/18] media: tegra-video: Add support for selection ioctl ops Sowjanya Komatineni
2020-06-10 6:02 ` [RFC PATCH v1 13/18] gpu: host1x: mipi: Add of_tegra_mipi_request() API Sowjanya Komatineni
2020-06-10 13:33 ` Dmitry Osipenko
2020-06-10 17:00 ` Sowjanya Komatineni
2020-06-10 6:02 ` [RFC PATCH v1 14/18] gpu: host1x: mipi: Split tegra_mipi_calibrate and tegra_mipi_wait Sowjanya Komatineni
2020-06-10 6:02 ` [RFC PATCH v1 15/18] media: tegra-video: Add CSI MIPI pads calibration Sowjanya Komatineni
2020-06-10 6:02 ` [RFC PATCH v1 16/18] media: tegra-video: Compute settle times based on the clock rate Sowjanya Komatineni
2020-06-10 6:02 ` [RFC PATCH v1 17/18] arm64: tegra: jetson-tx1: Add camera supplies Sowjanya Komatineni
2020-06-10 6:02 ` [RFC PATCH v1 18/18] arm64: tegra: Enable Tegra VI CSI support for Jetson Nano Sowjanya Komatineni
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