From: Aradhya Bhatia <a-bhatia1@ti.com>
To: Nishanth Menon <nm@ti.com>, Vignesh Raghavendra <vigneshr@ti.com>,
Tero Kristo <kristo@kernel.org>, Rob Herring <robh+dt@kernel.org>,
Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
Catalin Marinas <catalin.marinas@arm.com>,
Conor Dooley <conor+dt@kernel.org>, Will Deacon <will@kernel.org>,
Francesco Dolcini <francesco@dolcini.it>
Cc: Devicetree List <devicetree@vger.kernel.org>,
Linux Kernel List <linux-kernel@vger.kernel.org>,
Linux ARM Kernel List <linux-arm-kernel@lists.infradead.org>,
Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>,
Rahul T R <r-ravikumar@ti.com>, Devarsh Thakkar <devarsht@ti.com>,
Jai Luthra <j-luthra@ti.com>,
Jayesh Choudhary <j-choudhary@ti.com>,
Aradhya Bhatia <a-bhatia1@ti.com>
Subject: [PATCH v5 1/6] arm64: dts: ti: k3-am62x-sk-common: Update main-i2c1 frequency
Date: Wed, 9 Aug 2023 14:15:54 +0530 [thread overview]
Message-ID: <20230809084559.17322-2-a-bhatia1@ti.com> (raw)
In-Reply-To: <20230809084559.17322-1-a-bhatia1@ti.com>
The Display Data Channel (DDC) transactions between an HDMI transmitter
(SIL9022A in this case) and an HDMI monitor, occur at a maximum of
100KHz. That's the maximum supported frequency within DDC standards.
While the SIL9022A can transact with the core at 400KHz, it needs to
drop the frequency to 100KHz when communicating with the monitor,
otherwise, the i2c controller times out and shows warning like this.
[ 985.773431] omap_i2c 20010000.i2c: controller timed out
That feature, however, has not been enabled in the SIL9022 driver.
Since, dropping the frequency doesn't affect any other devices on the
bus, drop the main-i2c1 frequency from 400KHz to 100KHz.
Fixes: a841581451af ("arm64: dts: ti: Refractor AM625 SK dts")
Signed-off-by: Aradhya Bhatia <a-bhatia1@ti.com>
---
arch/arm64/boot/dts/ti/k3-am62x-sk-common.dtsi | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/arm64/boot/dts/ti/k3-am62x-sk-common.dtsi b/arch/arm64/boot/dts/ti/k3-am62x-sk-common.dtsi
index 34c8ffc553ec..540ed8a0d7fb 100644
--- a/arch/arm64/boot/dts/ti/k3-am62x-sk-common.dtsi
+++ b/arch/arm64/boot/dts/ti/k3-am62x-sk-common.dtsi
@@ -300,7 +300,7 @@ &main_i2c1 {
status = "okay";
pinctrl-names = "default";
pinctrl-0 = <&main_i2c1_pins_default>;
- clock-frequency = <400000>;
+ clock-frequency = <100000>;
tlv320aic3106: audio-codec@1b {
#sound-dai-cells = <0>;
--
2.40.1
WARNING: multiple messages have this Message-ID (diff)
From: Aradhya Bhatia <a-bhatia1@ti.com>
To: Nishanth Menon <nm@ti.com>, Vignesh Raghavendra <vigneshr@ti.com>,
Tero Kristo <kristo@kernel.org>, Rob Herring <robh+dt@kernel.org>,
Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
Catalin Marinas <catalin.marinas@arm.com>,
Conor Dooley <conor+dt@kernel.org>, Will Deacon <will@kernel.org>,
Francesco Dolcini <francesco@dolcini.it>
Cc: Devicetree List <devicetree@vger.kernel.org>,
Linux Kernel List <linux-kernel@vger.kernel.org>,
Linux ARM Kernel List <linux-arm-kernel@lists.infradead.org>,
Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>,
Rahul T R <r-ravikumar@ti.com>, Devarsh Thakkar <devarsht@ti.com>,
Jai Luthra <j-luthra@ti.com>,
Jayesh Choudhary <j-choudhary@ti.com>,
Aradhya Bhatia <a-bhatia1@ti.com>
Subject: [PATCH v5 1/6] arm64: dts: ti: k3-am62x-sk-common: Update main-i2c1 frequency
Date: Wed, 9 Aug 2023 14:15:54 +0530 [thread overview]
Message-ID: <20230809084559.17322-2-a-bhatia1@ti.com> (raw)
In-Reply-To: <20230809084559.17322-1-a-bhatia1@ti.com>
The Display Data Channel (DDC) transactions between an HDMI transmitter
(SIL9022A in this case) and an HDMI monitor, occur at a maximum of
100KHz. That's the maximum supported frequency within DDC standards.
While the SIL9022A can transact with the core at 400KHz, it needs to
drop the frequency to 100KHz when communicating with the monitor,
otherwise, the i2c controller times out and shows warning like this.
[ 985.773431] omap_i2c 20010000.i2c: controller timed out
That feature, however, has not been enabled in the SIL9022 driver.
Since, dropping the frequency doesn't affect any other devices on the
bus, drop the main-i2c1 frequency from 400KHz to 100KHz.
Fixes: a841581451af ("arm64: dts: ti: Refractor AM625 SK dts")
Signed-off-by: Aradhya Bhatia <a-bhatia1@ti.com>
---
arch/arm64/boot/dts/ti/k3-am62x-sk-common.dtsi | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/arm64/boot/dts/ti/k3-am62x-sk-common.dtsi b/arch/arm64/boot/dts/ti/k3-am62x-sk-common.dtsi
index 34c8ffc553ec..540ed8a0d7fb 100644
--- a/arch/arm64/boot/dts/ti/k3-am62x-sk-common.dtsi
+++ b/arch/arm64/boot/dts/ti/k3-am62x-sk-common.dtsi
@@ -300,7 +300,7 @@ &main_i2c1 {
status = "okay";
pinctrl-names = "default";
pinctrl-0 = <&main_i2c1_pins_default>;
- clock-frequency = <400000>;
+ clock-frequency = <100000>;
tlv320aic3106: audio-codec@1b {
#sound-dai-cells = <0>;
--
2.40.1
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next prev parent reply other threads:[~2023-08-09 8:46 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-08-09 8:45 [PATCH v5 0/6] arm64: ti: k3-am62: Add display support Aradhya Bhatia
2023-08-09 8:45 ` Aradhya Bhatia
2023-08-09 8:45 ` Aradhya Bhatia [this message]
2023-08-09 8:45 ` [PATCH v5 1/6] arm64: dts: ti: k3-am62x-sk-common: Update main-i2c1 frequency Aradhya Bhatia
2023-08-09 8:45 ` [PATCH v5 2/6] arm64: dts: ti: k3-am62-main: Add node for DSS Aradhya Bhatia
2023-08-09 8:45 ` Aradhya Bhatia
2023-08-09 8:45 ` [PATCH v5 3/6] arm64: dts: ti: k3-am62x-sk-common: Add HDMI support Aradhya Bhatia
2023-08-09 8:45 ` Aradhya Bhatia
2023-08-09 8:45 ` [PATCH v5 4/6] arm64: dts: ti: am62x-sk: Add overlay for HDMI audio Aradhya Bhatia
2023-08-09 8:45 ` Aradhya Bhatia
2023-09-08 22:13 ` Rob Herring
2023-09-08 22:13 ` Rob Herring
2023-08-09 8:45 ` [PATCH v5 5/6] arm64: dts: ti: k3-am625-beagleplay: Add HDMI support Aradhya Bhatia
2023-08-09 8:45 ` Aradhya Bhatia
2023-08-09 8:45 ` [PATCH v5 6/6] arm64: defconfig: Enable ITE_IT66121 HDMI transmitter Aradhya Bhatia
2023-08-09 8:45 ` Aradhya Bhatia
2023-08-09 14:40 ` [PATCH v5 0/6] arm64: ti: k3-am62: Add display support Nishanth Menon
2023-08-09 14:40 ` Nishanth Menon
2023-08-09 17:01 ` Andrew Davis
2023-08-09 17:01 ` Andrew Davis
2023-08-09 17:59 ` Nishanth Menon
2023-08-09 17:59 ` Nishanth Menon
2023-08-11 22:32 ` Nishanth Menon
2023-08-11 22:32 ` Nishanth Menon
2023-08-14 10:41 ` Aradhya Bhatia
2023-08-14 10:41 ` Aradhya Bhatia
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