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525b311bf8
As usual these patches were extracted from the raspberry pi repo: https://github.com/raspberrypi/linux/tree/rpi-4.4.y Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
58 lines
1.9 KiB
Diff
58 lines
1.9 KiB
Diff
From 4be409839b81a2fd724efc4cda01395130e20910 Mon Sep 17 00:00:00 2001
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From: Eric Anholt <eric@anholt.net>
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Date: Mon, 29 Feb 2016 17:53:01 -0800
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Subject: [PATCH 296/304] drm/vc4: Respect GPIO_ACTIVE_LOW on HDMI HPD if set
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in the devicetree.
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The original Raspberry Pi had the GPIO active high, but the later
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models are active low. The DT GPIO bindings allow specifying the
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active flag, except that it doesn't get propagated to the gpiodesc, so
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you have to handle it yourself.
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Signed-off-by: Eric Anholt <eric@anholt.net>
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Tested-by: Daniel Stone <daniels@collabora.com>
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(cherry picked from commit 0b06e0a7945130e6a187f7959529cba7725f573a)
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---
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drivers/gpu/drm/vc4/vc4_hdmi.c | 12 ++++++++++--
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1 file changed, 10 insertions(+), 2 deletions(-)
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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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@@ -47,6 +47,7 @@ struct vc4_hdmi {
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void __iomem *hdmicore_regs;
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void __iomem *hd_regs;
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int hpd_gpio;
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+ bool hpd_active_low;
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struct clk *pixel_clock;
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struct clk *hsm_clock;
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@@ -168,7 +169,8 @@ vc4_hdmi_connector_detect(struct drm_con
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return connector_status_connected;
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if (vc4->hdmi->hpd_gpio) {
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- if (gpio_get_value_cansleep(vc4->hdmi->hpd_gpio))
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+ if (gpio_get_value_cansleep(vc4->hdmi->hpd_gpio) ^
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+ vc4->hdmi->hpd_active_low)
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return connector_status_connected;
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else
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return connector_status_disconnected;
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@@ -519,11 +521,17 @@ static int vc4_hdmi_bind(struct device *
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* we'll use the HDMI core's register.
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*/
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if (of_find_property(dev->of_node, "hpd-gpios", &value)) {
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- hdmi->hpd_gpio = of_get_named_gpio(dev->of_node, "hpd-gpios", 0);
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+ enum of_gpio_flags hpd_gpio_flags;
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+
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+ hdmi->hpd_gpio = of_get_named_gpio_flags(dev->of_node,
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+ "hpd-gpios", 0,
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+ &hpd_gpio_flags);
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if (hdmi->hpd_gpio < 0) {
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ret = hdmi->hpd_gpio;
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goto err_unprepare_hsm;
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}
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+
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+ hdmi->hpd_active_low = hpd_gpio_flags & OF_GPIO_ACTIVE_LOW;
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}
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vc4->hdmi = hdmi;
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