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From 3542a39c5655242ba89bb4f51e9237cbb7e8cf09 Mon Sep 17 00:00:00 2001
From: Dave Stevenson <dave.stevenson@raspberrypi.com>
Date: Fri, 19 Nov 2021 16:16:40 +0000
Subject: [PATCH] drm/vc4: Ensure vc4_hdmi doesn't use 2711 HPD
registers on Pi0-3
The existing logic was flawed in that it could try reading the
2711 specific registers for HPD on a CM1/3 where the HPD GPIO
hadn't been defined in DT.
Ensure we don't do the 2711 register read on invalid hardware,
and then
Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
---
drivers/gpu/drm/vc4/vc4_hdmi.c | 24 ++++++++++++++++--------
drivers/gpu/drm/vc4/vc4_hdmi.h | 3 +++
2 files changed, 19 insertions(+), 8 deletions(-)
--- a/drivers/gpu/drm/vc4/vc4_hdmi.c
+++ b/drivers/gpu/drm/vc4/vc4_hdmi.c
@@ -206,14 +206,8 @@ vc4_hdmi_connector_detect(struct drm_con
if (gpiod_get_value_cansleep(vc4_hdmi->hpd_gpio))
connected = true;
} else {
- unsigned long flags;
- u32 hotplug;
-
- spin_lock_irqsave(&vc4_hdmi->hw_lock, flags);
- hotplug = HDMI_READ(HDMI_HOTPLUG);
- spin_unlock_irqrestore(&vc4_hdmi->hw_lock, flags);
-
- if (hotplug & VC4_HDMI_HOTPLUG_CONNECTED)
+ if (vc4_hdmi->variant->hp_detect &&
+ vc4_hdmi->variant->hp_detect(vc4_hdmi))
connected = true;
}
@@ -1355,6 +1349,18 @@ static u32 vc5_hdmi_channel_map(struct v
return channel_map;
}
+static bool vc5_hdmi_hp_detect(struct vc4_hdmi *vc4_hdmi)
+{
+ unsigned long flags;
+ u32 hotplug;
+
+ spin_lock_irqsave(&vc4_hdmi->hw_lock, flags);
+ hotplug = HDMI_READ(HDMI_HOTPLUG);
+ spin_unlock_irqrestore(&vc4_hdmi->hw_lock, flags);
+
+ return !!(hotplug & VC4_HDMI_HOTPLUG_CONNECTED);
+}
+
/* HDMI audio codec callbacks */
static void vc4_hdmi_audio_set_mai_clock(struct vc4_hdmi *vc4_hdmi,
unsigned int samplerate)
@@ -2776,6 +2782,7 @@ static const struct vc4_hdmi_variant bcm
.phy_rng_disable = vc5_hdmi_phy_rng_disable,
.channel_map = vc5_hdmi_channel_map,
.supports_hdr = true,
+ .hp_detect = vc5_hdmi_hp_detect,
};
static const struct vc4_hdmi_variant bcm2711_hdmi1_variant = {
@@ -2804,6 +2811,7 @@ static const struct vc4_hdmi_variant bcm
.phy_rng_disable = vc5_hdmi_phy_rng_disable,
.channel_map = vc5_hdmi_channel_map,
.supports_hdr = true,
+ .hp_detect = vc5_hdmi_hp_detect,
};
static const struct of_device_id vc4_hdmi_dt_match[] = {
--- a/drivers/gpu/drm/vc4/vc4_hdmi.h
+++ b/drivers/gpu/drm/vc4/vc4_hdmi.h
@@ -102,6 +102,9 @@ struct vc4_hdmi_variant {
/* Enables HDR metadata */
bool supports_hdr;
+
+ /* Callback for hardware specific hotplug detect */
+ bool (*hp_detect)(struct vc4_hdmi *vc4_hdmi);
};
/* HDMI audio information */
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