* [PATCH] ARM: dts: Disable HDMI CEC internal pull-ups
@ 2017-06-27 8:58 Tony Lindgren
[not found] ` <20170627085832.30949-1-tony-4v6yS6AI5VpBDgjK7y7TUQ@public.gmane.org>
0 siblings, 1 reply; 2+ messages in thread
From: Tony Lindgren @ 2017-06-27 8:58 UTC (permalink / raw)
To: linux-omap-u79uwXL29TY76Z2rM5mHXA
Cc: Benoît Cousson, devicetree-u79uwXL29TY76Z2rM5mHXA,
Dmitry Lifshitz, Tomi Valkeinen
Devices using an external encoder, ESD protection and level shifter
such as tpd12s015 or ip4791cz12 have the CEC pull in the encoder
chip. And on var-som-om44, there is external pull up resistor R30.
So the internal CEC pull-up resistor needs to be disabled as otherwise
the external and internal pull are parallel making the pull value
much smaller than intended. This leads into the CEC not working as
reported by Hans Verkuil <hverkuil-qWit8jRvyhVmR6Xm/wNWPw@public.gmane.org>.
Reported-by: Hans Verkuil <hverkuil-qWit8jRvyhVmR6Xm/wNWPw@public.gmane.org>
Cc: Dmitry Lifshitz <lifshitz-UTxiZqZC01RS1MOuV/RT9w@public.gmane.org>
Cc: Tomi Valkeinen <tomi.valkeinen-l0cyMroinI0@public.gmane.org>
Signed-off-by: Tony Lindgren <tony-4v6yS6AI5VpBDgjK7y7TUQ@public.gmane.org>
---
Dmitry, care to check that also omap5-cm-t54 has external pull on CEC pin?
---
arch/arm/boot/dts/omap4-droid4-xt894.dts | 2 +-
arch/arm/boot/dts/omap4-duovero-parlor.dts | 2 +-
arch/arm/boot/dts/omap4-panda-common.dtsi | 2 +-
arch/arm/boot/dts/omap4-sdp-es23plus.dts | 2 +-
arch/arm/boot/dts/omap4-sdp.dts | 2 +-
arch/arm/boot/dts/omap4-var-om44customboard.dtsi | 2 +-
arch/arm/boot/dts/omap5-board-common.dtsi | 2 +-
arch/arm/boot/dts/omap5-cm-t54.dts | 2 +-
8 files changed, 8 insertions(+), 8 deletions(-)
diff --git a/arch/arm/boot/dts/omap4-droid4-xt894.dts b/arch/arm/boot/dts/omap4-droid4-xt894.dts
--- a/arch/arm/boot/dts/omap4-droid4-xt894.dts
+++ b/arch/arm/boot/dts/omap4-droid4-xt894.dts
@@ -373,7 +373,7 @@
/* hdmi_cec.hdmi_cec, hdmi_scl.hdmi_scl, hdmi_sda.hdmi_sda */
dss_hdmi_pins: pinmux_dss_hdmi_pins {
pinctrl-single,pins = <
- OMAP4_IOPAD(0x09a, PIN_INPUT_PULLUP | MUX_MODE0)
+ OMAP4_IOPAD(0x09a, PIN_INPUT | MUX_MODE0)
OMAP4_IOPAD(0x09c, PIN_INPUT | MUX_MODE0)
OMAP4_IOPAD(0x09e, PIN_INPUT | MUX_MODE0)
>;
diff --git a/arch/arm/boot/dts/omap4-duovero-parlor.dts b/arch/arm/boot/dts/omap4-duovero-parlor.dts
--- a/arch/arm/boot/dts/omap4-duovero-parlor.dts
+++ b/arch/arm/boot/dts/omap4-duovero-parlor.dts
@@ -100,7 +100,7 @@
dss_hdmi_pins: pinmux_dss_hdmi_pins {
pinctrl-single,pins = <
OMAP4_IOPAD(0x098, PIN_INPUT | MUX_MODE3) /* hdmi_hpd.gpio_63 */
- OMAP4_IOPAD(0x09a, PIN_INPUT_PULLUP | MUX_MODE0) /* hdmi_cec.hdmi_cec */
+ OMAP4_IOPAD(0x09a, PIN_INPUT | MUX_MODE0) /* hdmi_cec.hdmi_cec */
OMAP4_IOPAD(0x09c, PIN_INPUT_PULLUP | MUX_MODE0) /* hdmi_ddc_scl.hdmi_ddc_scl */
OMAP4_IOPAD(0x09e, PIN_INPUT_PULLUP | MUX_MODE0) /* hdmi_ddc_sda.hdmi_ddc_sda */
>;
diff --git a/arch/arm/boot/dts/omap4-panda-common.dtsi b/arch/arm/boot/dts/omap4-panda-common.dtsi
--- a/arch/arm/boot/dts/omap4-panda-common.dtsi
+++ b/arch/arm/boot/dts/omap4-panda-common.dtsi
@@ -267,7 +267,7 @@
dss_hdmi_pins: pinmux_dss_hdmi_pins {
pinctrl-single,pins = <
- OMAP4_IOPAD(0x09a, PIN_INPUT_PULLUP | MUX_MODE0) /* hdmi_cec.hdmi_cec */
+ OMAP4_IOPAD(0x09a, PIN_INPUT | MUX_MODE0) /* hdmi_cec.hdmi_cec */
OMAP4_IOPAD(0x09c, PIN_INPUT_PULLUP | MUX_MODE0) /* hdmi_scl.hdmi_scl */
OMAP4_IOPAD(0x09e, PIN_INPUT_PULLUP | MUX_MODE0) /* hdmi_sda.hdmi_sda */
>;
diff --git a/arch/arm/boot/dts/omap4-sdp-es23plus.dts b/arch/arm/boot/dts/omap4-sdp-es23plus.dts
--- a/arch/arm/boot/dts/omap4-sdp-es23plus.dts
+++ b/arch/arm/boot/dts/omap4-sdp-es23plus.dts
@@ -10,7 +10,7 @@
/* SDP boards with 4430 ES2.3+ or 4460 have external pullups on SCL & SDA */
&dss_hdmi_pins {
pinctrl-single,pins = <
- OMAP4_IOPAD(0x09a, PIN_INPUT_PULLUP | MUX_MODE0) /* hdmi_cec.hdmi_cec */
+ OMAP4_IOPAD(0x09a, PIN_INPUT | MUX_MODE0) /* hdmi_cec.hdmi_cec */
OMAP4_IOPAD(0x09c, PIN_INPUT | MUX_MODE0) /* hdmi_scl.hdmi_scl */
OMAP4_IOPAD(0x09e, PIN_INPUT | MUX_MODE0) /* hdmi_sda.hdmi_sda */
>;
diff --git a/arch/arm/boot/dts/omap4-sdp.dts b/arch/arm/boot/dts/omap4-sdp.dts
--- a/arch/arm/boot/dts/omap4-sdp.dts
+++ b/arch/arm/boot/dts/omap4-sdp.dts
@@ -290,7 +290,7 @@
dss_hdmi_pins: pinmux_dss_hdmi_pins {
pinctrl-single,pins = <
- OMAP4_IOPAD(0x09a, PIN_INPUT_PULLUP | MUX_MODE0) /* hdmi_cec.hdmi_cec */
+ OMAP4_IOPAD(0x09a, PIN_INPUT | MUX_MODE0) /* hdmi_cec.hdmi_cec */
OMAP4_IOPAD(0x09c, PIN_INPUT_PULLUP | MUX_MODE0) /* hdmi_scl.hdmi_scl */
OMAP4_IOPAD(0x09e, PIN_INPUT_PULLUP | MUX_MODE0) /* hdmi_sda.hdmi_sda */
>;
diff --git a/arch/arm/boot/dts/omap4-var-om44customboard.dtsi b/arch/arm/boot/dts/omap4-var-om44customboard.dtsi
--- a/arch/arm/boot/dts/omap4-var-om44customboard.dtsi
+++ b/arch/arm/boot/dts/omap4-var-om44customboard.dtsi
@@ -122,7 +122,7 @@
dss_hdmi_pins: pinmux_dss_hdmi_pins {
pinctrl-single,pins = <
- OMAP4_IOPAD(0x09a, PIN_INPUT_PULLUP | MUX_MODE0) /* hdmi_cec.hdmi_cec */
+ OMAP4_IOPAD(0x09a, PIN_INPUT | MUX_MODE0) /* hdmi_cec.hdmi_cec */
OMAP4_IOPAD(0x09c, PIN_INPUT_PULLUP | MUX_MODE0) /* hdmi_scl.hdmi_scl */
OMAP4_IOPAD(0x09e, PIN_INPUT_PULLUP | MUX_MODE0) /* hdmi_sda.hdmi_sda */
>;
diff --git a/arch/arm/boot/dts/omap5-board-common.dtsi b/arch/arm/boot/dts/omap5-board-common.dtsi
--- a/arch/arm/boot/dts/omap5-board-common.dtsi
+++ b/arch/arm/boot/dts/omap5-board-common.dtsi
@@ -294,7 +294,7 @@
dss_hdmi_pins: pinmux_dss_hdmi_pins {
pinctrl-single,pins = <
- OMAP5_IOPAD(0x13c, PIN_INPUT_PULLUP | MUX_MODE0) /* hdmi_cec.hdmi_cec */
+ OMAP5_IOPAD(0x13c, PIN_INPUT | MUX_MODE0) /* hdmi_cec.hdmi_cec */
OMAP5_IOPAD(0x140, PIN_INPUT | MUX_MODE0) /* hdmi_ddc_scl.hdmi_ddc_scl */
OMAP5_IOPAD(0x142, PIN_INPUT | MUX_MODE0) /* hdmi_ddc_sda.hdmi_ddc_sda */
>;
diff --git a/arch/arm/boot/dts/omap5-cm-t54.dts b/arch/arm/boot/dts/omap5-cm-t54.dts
--- a/arch/arm/boot/dts/omap5-cm-t54.dts
+++ b/arch/arm/boot/dts/omap5-cm-t54.dts
@@ -266,7 +266,7 @@
dss_hdmi_pins: pinmux_dss_hdmi_pins {
pinctrl-single,pins = <
- OMAP5_IOPAD(0x013c, PIN_INPUT_PULLUP | MUX_MODE0) /* hdmi_cec */
+ OMAP5_IOPAD(0x013c, PIN_INPUT | MUX_MODE0) /* hdmi_cec */
OMAP5_IOPAD(0x0140, PIN_INPUT | MUX_MODE0) /* hdmi_ddc_scl */
OMAP5_IOPAD(0x0142, PIN_INPUT | MUX_MODE0) /* hdmi_ddc_sda */
>;
--
2.13.0
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^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: [PATCH] ARM: dts: Disable HDMI CEC internal pull-ups
[not found] ` <20170627085832.30949-1-tony-4v6yS6AI5VpBDgjK7y7TUQ@public.gmane.org>
@ 2017-06-27 9:06 ` Sebastian Reichel
0 siblings, 0 replies; 2+ messages in thread
From: Sebastian Reichel @ 2017-06-27 9:06 UTC (permalink / raw)
To: Tony Lindgren
Cc: linux-omap-u79uwXL29TY76Z2rM5mHXA, Benoît Cousson,
devicetree-u79uwXL29TY76Z2rM5mHXA, Dmitry Lifshitz,
Tomi Valkeinen
[-- Attachment #1: Type: text/plain, Size: 6886 bytes --]
Hi,
On Tue, Jun 27, 2017 at 01:58:32AM -0700, Tony Lindgren wrote:
> Devices using an external encoder, ESD protection and level shifter
> such as tpd12s015 or ip4791cz12 have the CEC pull in the encoder
> chip. And on var-som-om44, there is external pull up resistor R30.
>
> So the internal CEC pull-up resistor needs to be disabled as otherwise
> the external and internal pull are parallel making the pull value
> much smaller than intended. This leads into the CEC not working as
> reported by Hans Verkuil <hverkuil-qWit8jRvyhVmR6Xm/wNWPw@public.gmane.org>.
>
> Reported-by: Hans Verkuil <hverkuil-qWit8jRvyhVmR6Xm/wNWPw@public.gmane.org>
> Cc: Dmitry Lifshitz <lifshitz-UTxiZqZC01RS1MOuV/RT9w@public.gmane.org>
> Cc: Tomi Valkeinen <tomi.valkeinen-l0cyMroinI0@public.gmane.org>
> Signed-off-by: Tony Lindgren <tony-4v6yS6AI5VpBDgjK7y7TUQ@public.gmane.org>
Reviewed-by: Sebastian Reichel <sebastian.reichel-ZGY8ohtN/8pPYcu2f3hruQ@public.gmane.org>
-- Sebastian
> ---
>
> Dmitry, care to check that also omap5-cm-t54 has external pull on CEC pin?
>
> ---
> arch/arm/boot/dts/omap4-droid4-xt894.dts | 2 +-
> arch/arm/boot/dts/omap4-duovero-parlor.dts | 2 +-
> arch/arm/boot/dts/omap4-panda-common.dtsi | 2 +-
> arch/arm/boot/dts/omap4-sdp-es23plus.dts | 2 +-
> arch/arm/boot/dts/omap4-sdp.dts | 2 +-
> arch/arm/boot/dts/omap4-var-om44customboard.dtsi | 2 +-
> arch/arm/boot/dts/omap5-board-common.dtsi | 2 +-
> arch/arm/boot/dts/omap5-cm-t54.dts | 2 +-
> 8 files changed, 8 insertions(+), 8 deletions(-)
>
> diff --git a/arch/arm/boot/dts/omap4-droid4-xt894.dts b/arch/arm/boot/dts/omap4-droid4-xt894.dts
> --- a/arch/arm/boot/dts/omap4-droid4-xt894.dts
> +++ b/arch/arm/boot/dts/omap4-droid4-xt894.dts
> @@ -373,7 +373,7 @@
> /* hdmi_cec.hdmi_cec, hdmi_scl.hdmi_scl, hdmi_sda.hdmi_sda */
> dss_hdmi_pins: pinmux_dss_hdmi_pins {
> pinctrl-single,pins = <
> - OMAP4_IOPAD(0x09a, PIN_INPUT_PULLUP | MUX_MODE0)
> + OMAP4_IOPAD(0x09a, PIN_INPUT | MUX_MODE0)
> OMAP4_IOPAD(0x09c, PIN_INPUT | MUX_MODE0)
> OMAP4_IOPAD(0x09e, PIN_INPUT | MUX_MODE0)
> >;
> diff --git a/arch/arm/boot/dts/omap4-duovero-parlor.dts b/arch/arm/boot/dts/omap4-duovero-parlor.dts
> --- a/arch/arm/boot/dts/omap4-duovero-parlor.dts
> +++ b/arch/arm/boot/dts/omap4-duovero-parlor.dts
> @@ -100,7 +100,7 @@
> dss_hdmi_pins: pinmux_dss_hdmi_pins {
> pinctrl-single,pins = <
> OMAP4_IOPAD(0x098, PIN_INPUT | MUX_MODE3) /* hdmi_hpd.gpio_63 */
> - OMAP4_IOPAD(0x09a, PIN_INPUT_PULLUP | MUX_MODE0) /* hdmi_cec.hdmi_cec */
> + OMAP4_IOPAD(0x09a, PIN_INPUT | MUX_MODE0) /* hdmi_cec.hdmi_cec */
> OMAP4_IOPAD(0x09c, PIN_INPUT_PULLUP | MUX_MODE0) /* hdmi_ddc_scl.hdmi_ddc_scl */
> OMAP4_IOPAD(0x09e, PIN_INPUT_PULLUP | MUX_MODE0) /* hdmi_ddc_sda.hdmi_ddc_sda */
> >;
> diff --git a/arch/arm/boot/dts/omap4-panda-common.dtsi b/arch/arm/boot/dts/omap4-panda-common.dtsi
> --- a/arch/arm/boot/dts/omap4-panda-common.dtsi
> +++ b/arch/arm/boot/dts/omap4-panda-common.dtsi
> @@ -267,7 +267,7 @@
>
> dss_hdmi_pins: pinmux_dss_hdmi_pins {
> pinctrl-single,pins = <
> - OMAP4_IOPAD(0x09a, PIN_INPUT_PULLUP | MUX_MODE0) /* hdmi_cec.hdmi_cec */
> + OMAP4_IOPAD(0x09a, PIN_INPUT | MUX_MODE0) /* hdmi_cec.hdmi_cec */
> OMAP4_IOPAD(0x09c, PIN_INPUT_PULLUP | MUX_MODE0) /* hdmi_scl.hdmi_scl */
> OMAP4_IOPAD(0x09e, PIN_INPUT_PULLUP | MUX_MODE0) /* hdmi_sda.hdmi_sda */
> >;
> diff --git a/arch/arm/boot/dts/omap4-sdp-es23plus.dts b/arch/arm/boot/dts/omap4-sdp-es23plus.dts
> --- a/arch/arm/boot/dts/omap4-sdp-es23plus.dts
> +++ b/arch/arm/boot/dts/omap4-sdp-es23plus.dts
> @@ -10,7 +10,7 @@
> /* SDP boards with 4430 ES2.3+ or 4460 have external pullups on SCL & SDA */
> &dss_hdmi_pins {
> pinctrl-single,pins = <
> - OMAP4_IOPAD(0x09a, PIN_INPUT_PULLUP | MUX_MODE0) /* hdmi_cec.hdmi_cec */
> + OMAP4_IOPAD(0x09a, PIN_INPUT | MUX_MODE0) /* hdmi_cec.hdmi_cec */
> OMAP4_IOPAD(0x09c, PIN_INPUT | MUX_MODE0) /* hdmi_scl.hdmi_scl */
> OMAP4_IOPAD(0x09e, PIN_INPUT | MUX_MODE0) /* hdmi_sda.hdmi_sda */
> >;
> diff --git a/arch/arm/boot/dts/omap4-sdp.dts b/arch/arm/boot/dts/omap4-sdp.dts
> --- a/arch/arm/boot/dts/omap4-sdp.dts
> +++ b/arch/arm/boot/dts/omap4-sdp.dts
> @@ -290,7 +290,7 @@
>
> dss_hdmi_pins: pinmux_dss_hdmi_pins {
> pinctrl-single,pins = <
> - OMAP4_IOPAD(0x09a, PIN_INPUT_PULLUP | MUX_MODE0) /* hdmi_cec.hdmi_cec */
> + OMAP4_IOPAD(0x09a, PIN_INPUT | MUX_MODE0) /* hdmi_cec.hdmi_cec */
> OMAP4_IOPAD(0x09c, PIN_INPUT_PULLUP | MUX_MODE0) /* hdmi_scl.hdmi_scl */
> OMAP4_IOPAD(0x09e, PIN_INPUT_PULLUP | MUX_MODE0) /* hdmi_sda.hdmi_sda */
> >;
> diff --git a/arch/arm/boot/dts/omap4-var-om44customboard.dtsi b/arch/arm/boot/dts/omap4-var-om44customboard.dtsi
> --- a/arch/arm/boot/dts/omap4-var-om44customboard.dtsi
> +++ b/arch/arm/boot/dts/omap4-var-om44customboard.dtsi
> @@ -122,7 +122,7 @@
>
> dss_hdmi_pins: pinmux_dss_hdmi_pins {
> pinctrl-single,pins = <
> - OMAP4_IOPAD(0x09a, PIN_INPUT_PULLUP | MUX_MODE0) /* hdmi_cec.hdmi_cec */
> + OMAP4_IOPAD(0x09a, PIN_INPUT | MUX_MODE0) /* hdmi_cec.hdmi_cec */
> OMAP4_IOPAD(0x09c, PIN_INPUT_PULLUP | MUX_MODE0) /* hdmi_scl.hdmi_scl */
> OMAP4_IOPAD(0x09e, PIN_INPUT_PULLUP | MUX_MODE0) /* hdmi_sda.hdmi_sda */
> >;
> diff --git a/arch/arm/boot/dts/omap5-board-common.dtsi b/arch/arm/boot/dts/omap5-board-common.dtsi
> --- a/arch/arm/boot/dts/omap5-board-common.dtsi
> +++ b/arch/arm/boot/dts/omap5-board-common.dtsi
> @@ -294,7 +294,7 @@
>
> dss_hdmi_pins: pinmux_dss_hdmi_pins {
> pinctrl-single,pins = <
> - OMAP5_IOPAD(0x13c, PIN_INPUT_PULLUP | MUX_MODE0) /* hdmi_cec.hdmi_cec */
> + OMAP5_IOPAD(0x13c, PIN_INPUT | MUX_MODE0) /* hdmi_cec.hdmi_cec */
> OMAP5_IOPAD(0x140, PIN_INPUT | MUX_MODE0) /* hdmi_ddc_scl.hdmi_ddc_scl */
> OMAP5_IOPAD(0x142, PIN_INPUT | MUX_MODE0) /* hdmi_ddc_sda.hdmi_ddc_sda */
> >;
> diff --git a/arch/arm/boot/dts/omap5-cm-t54.dts b/arch/arm/boot/dts/omap5-cm-t54.dts
> --- a/arch/arm/boot/dts/omap5-cm-t54.dts
> +++ b/arch/arm/boot/dts/omap5-cm-t54.dts
> @@ -266,7 +266,7 @@
>
> dss_hdmi_pins: pinmux_dss_hdmi_pins {
> pinctrl-single,pins = <
> - OMAP5_IOPAD(0x013c, PIN_INPUT_PULLUP | MUX_MODE0) /* hdmi_cec */
> + OMAP5_IOPAD(0x013c, PIN_INPUT | MUX_MODE0) /* hdmi_cec */
> OMAP5_IOPAD(0x0140, PIN_INPUT | MUX_MODE0) /* hdmi_ddc_scl */
> OMAP5_IOPAD(0x0142, PIN_INPUT | MUX_MODE0) /* hdmi_ddc_sda */
> >;
> --
> 2.13.0
> --
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2017-06-27 8:58 [PATCH] ARM: dts: Disable HDMI CEC internal pull-ups Tony Lindgren
[not found] ` <20170627085832.30949-1-tony-4v6yS6AI5VpBDgjK7y7TUQ@public.gmane.org>
2017-06-27 9:06 ` Sebastian Reichel
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