c06fb25d1f
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59 lines
2.1 KiB
Diff
59 lines
2.1 KiB
Diff
From b67f05e1c4b2027b4950661b118c91850e747ee7 Mon Sep 17 00:00:00 2001
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From: Dom Cobley <popcornmix@gmail.com>
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Date: Wed, 1 Jun 2022 15:43:51 +0100
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Subject: [PATCH 0028/1085] drm/vc4_hdmi: Allow hotplug detect to be forced
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See: https://forum.libreelec.tv/thread/24783-tv-avr-turns-back-on-right-after-turning-them-off
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While the kernel provides a :D flag for assuming device is connected,
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it doesn't stop this function from being called and generating a cec_phys_addr_invalidate
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message when hotplug is deasserted.
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That message provokes a flurry of CEC messages which for many users results in the TV
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switching back on again and it's very hard to get it to stay switched off.
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It seems to only occur with an AVR and TV connected but has been observed across a
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number of manufacturers.
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The issue started with https://github.com/raspberrypi/linux/pull/4371
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and this provides an optional way of getting back the old behaviour
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Signed-off-by: Dom Cobley <popcornmix@gmail.com>
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---
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drivers/gpu/drm/vc4/vc4_hdmi.c | 10 +++++++++-
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1 file changed, 9 insertions(+), 1 deletion(-)
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--- a/drivers/gpu/drm/vc4/vc4_hdmi.c
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+++ b/drivers/gpu/drm/vc4/vc4_hdmi.c
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@@ -41,6 +41,8 @@
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#include <linux/component.h>
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#include <linux/gpio/consumer.h>
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#include <linux/i2c.h>
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+#include <linux/module.h>
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+#include <linux/moduleparam.h>
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#include <linux/of.h>
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#include <linux/of_address.h>
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#include <linux/pm_runtime.h>
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@@ -109,6 +111,10 @@
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#define HDMI_14_MAX_TMDS_CLK (340 * 1000 * 1000)
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+/* bit field to force hotplug detection. bit0 = HDMI0 */
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+static int force_hotplug = 0;
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+module_param(force_hotplug, int, 0644);
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+
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static const char * const output_format_str[] = {
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[VC4_HDMI_OUTPUT_RGB] = "RGB",
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[VC4_HDMI_OUTPUT_YUV420] = "YUV 4:2:0",
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@@ -482,7 +488,9 @@ static int vc4_hdmi_connector_detect_ctx
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return connector_status_unknown;
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}
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- if (vc4_hdmi->hpd_gpio) {
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+ if (force_hotplug & BIT(vc4_hdmi->encoder.type - VC4_ENCODER_TYPE_HDMI0))
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+ status = connector_status_connected;
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+ else if (vc4_hdmi->hpd_gpio) {
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if (gpiod_get_value_cansleep(vc4_hdmi->hpd_gpio))
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status = connector_status_connected;
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} else {
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