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TEST linux (RPi): add PR5052

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Signed-off-by: Matthias Reichl <hias@horus.com>
This commit is contained in:
Matthias Reichl 2022-06-03 14:12:18 +02:00
parent 9a54a1112a
commit 7042215a72
1 changed files with 60 additions and 0 deletions
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60
packages/linux/patches/raspberrypi/linux-010-pr5052.patch Normal file
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@ -0,0 +1,60 @@
From 00c2be0300d88d8c095921018306817650fe271b Mon Sep 17 00:00:00 2001
From: Dom Cobley <popcornmix@gmail.com>
Date: Wed, 1 Jun 2022 15:43:51 +0100
Subject: [PATCH] drm/vc4_hdmi: Allow hotplug detect to be forced
See: https://forum.libreelec.tv/thread/24783-tv-avr-turns-back-on-right-after-turning-them-off
While the kernel provides a :D flag for assuming device is connected,
it doesn't stop this function from being called and generating a cec_phys_addr_invalidate
message when hotplug is deasserted.
That message provokes a flurry of CEC messages which for many users results in the TV
switching back on again and it's very hard to get it to stay switched off.
It seems to only occur with an AVR and TV connected but has been observed across a
number of manufacturers.
The issue started with https://github.com/raspberrypi/linux/pull/4371
and this provides an optional way of getting back the old behaviour
Signed-off-by: Dom Cobley <popcornmix@gmail.com>
---
drivers/gpu/drm/vc4/vc4_hdmi.c | 10 +++++++++-
1 file changed, 9 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/vc4/vc4_hdmi.c b/drivers/gpu/drm/vc4/vc4_hdmi.c
index 5d37cd0741b6f..793dc56746ee6 100644
--- a/drivers/gpu/drm/vc4/vc4_hdmi.c
+++ b/drivers/gpu/drm/vc4/vc4_hdmi.c
@@ -40,6 +40,8 @@
#include <linux/component.h>
#include <linux/gpio/consumer.h>
#include <linux/i2c.h>
+#include <linux/module.h>
+#include <linux/moduleparam.h>
#include <linux/of_address.h>
#include <linux/of_gpio.h>
#include <linux/of_platform.h>
@@ -113,6 +115,10 @@
#define HDMI_14_MAX_TMDS_CLK (340 * 1000 * 1000)
+/* bit field to force hotplug detection. bit0 = HDMI0 */
+static int force_hotplug = 0;
+module_param(force_hotplug, int, 0644);
+
static const char * const output_format_str[] = {
[VC4_HDMI_OUTPUT_RGB] = "RGB",
[VC4_HDMI_OUTPUT_YUV420] = "YUV 4:2:0",
@@ -248,7 +254,9 @@ vc4_hdmi_connector_detect(struct drm_connector *connector, bool force)
WARN_ON(pm_runtime_resume_and_get(&vc4_hdmi->pdev->dev));
- if (vc4_hdmi->hpd_gpio) {
+ if (force_hotplug & BIT(vc4_hdmi->encoder.base.type - VC4_ENCODER_TYPE_HDMI0))
+ connected = true;
+ else if (vc4_hdmi->hpd_gpio) {
if (gpiod_get_value_cansleep(vc4_hdmi->hpd_gpio))
connected = true;
} else {