diff options
Diffstat (limited to 'target/linux/brcm2708/patches-4.4/0295-drm-vc4-Respect-GPIO_ACTIVE_LOW-on-HDMI-HPD-if-set-i.patch')
| -rw-r--r-- | target/linux/brcm2708/patches-4.4/0295-drm-vc4-Respect-GPIO_ACTIVE_LOW-on-HDMI-HPD-if-set-i.patch | 57 |
1 files changed, 57 insertions, 0 deletions
diff --git a/target/linux/brcm2708/patches-4.4/0295-drm-vc4-Respect-GPIO_ACTIVE_LOW-on-HDMI-HPD-if-set-i.patch b/target/linux/brcm2708/patches-4.4/0295-drm-vc4-Respect-GPIO_ACTIVE_LOW-on-HDMI-HPD-if-set-i.patch new file mode 100644 index 0000000000..c068bd9dfd --- /dev/null +++ b/target/linux/brcm2708/patches-4.4/0295-drm-vc4-Respect-GPIO_ACTIVE_LOW-on-HDMI-HPD-if-set-i.patch @@ -0,0 +1,57 @@ +From 2e6c1ee022829aa063838c244dbb94e2a8df04d2 Mon Sep 17 00:00:00 2001 +From: Eric Anholt <eric@anholt.net> +Date: Mon, 29 Feb 2016 17:53:01 -0800 +Subject: [PATCH 295/381] drm/vc4: Respect GPIO_ACTIVE_LOW on HDMI HPD if set + in the devicetree. + +The original Raspberry Pi had the GPIO active high, but the later +models are active low. The DT GPIO bindings allow specifying the +active flag, except that it doesn't get propagated to the gpiodesc, so +you have to handle it yourself. + +Signed-off-by: Eric Anholt <eric@anholt.net> +Tested-by: Daniel Stone <daniels@collabora.com> +(cherry picked from commit 0b06e0a7945130e6a187f7959529cba7725f573a) +--- + drivers/gpu/drm/vc4/vc4_hdmi.c | 12 ++++++++++-- + 1 file changed, 10 insertions(+), 2 deletions(-) + +--- a/drivers/gpu/drm/vc4/vc4_hdmi.c ++++ b/drivers/gpu/drm/vc4/vc4_hdmi.c +@@ -47,6 +47,7 @@ struct vc4_hdmi { + void __iomem *hdmicore_regs; + void __iomem *hd_regs; + int hpd_gpio; ++ bool hpd_active_low; + + struct clk *pixel_clock; + struct clk *hsm_clock; +@@ -168,7 +169,8 @@ vc4_hdmi_connector_detect(struct drm_con + return connector_status_connected; + + if (vc4->hdmi->hpd_gpio) { +- if (gpio_get_value_cansleep(vc4->hdmi->hpd_gpio)) ++ if (gpio_get_value_cansleep(vc4->hdmi->hpd_gpio) ^ ++ vc4->hdmi->hpd_active_low) + return connector_status_connected; + else + return connector_status_disconnected; +@@ -519,11 +521,17 @@ static int vc4_hdmi_bind(struct device * + * we'll use the HDMI core's register. + */ + if (of_find_property(dev->of_node, "hpd-gpios", &value)) { +- hdmi->hpd_gpio = of_get_named_gpio(dev->of_node, "hpd-gpios", 0); ++ enum of_gpio_flags hpd_gpio_flags; ++ ++ hdmi->hpd_gpio = of_get_named_gpio_flags(dev->of_node, ++ "hpd-gpios", 0, ++ &hpd_gpio_flags); + if (hdmi->hpd_gpio < 0) { + ret = hdmi->hpd_gpio; + goto err_unprepare_hsm; + } ++ ++ hdmi->hpd_active_low = hpd_gpio_flags & OF_GPIO_ACTIVE_LOW; + } + + vc4->hdmi = hdmi; |