disable FB

hc

2024-01-04 1543e317f1da31b75942316931e8f491a8920811

 kernel/drivers/gpu/drm/nouveau/nvkm/subdev/gpio/base.c
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@@ -23,6 +23,7 @@
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  */
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 #include "priv.h"
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+#include <core/option.h>
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 #include <core/notify.h>
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 static int
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@@ -182,12 +183,43 @@
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 	{ }
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 };
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+static enum dcb_gpio_func_name power_checks[] = {
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+	DCB_GPIO_THERM_EXT_POWER_EVENT,
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+	DCB_GPIO_POWER_ALERT,
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+	DCB_GPIO_EXT_POWER_LOW,
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+};
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+
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 static int
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 nvkm_gpio_init(struct nvkm_subdev *subdev)
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 {
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 	struct nvkm_gpio *gpio = nvkm_gpio(subdev);
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+	struct dcb_gpio_func func;
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+	int ret;
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+	int i;
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+
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 	if (dmi_check_system(gpio_reset_ids))
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 		nvkm_gpio_reset(gpio, DCB_GPIO_UNUSED);
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+
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+	if (nvkm_boolopt(subdev->device->cfgopt, "NvPowerChecks", true)) {
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+		for (i = 0; i < ARRAY_SIZE(power_checks); ++i) {
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+			ret = nvkm_gpio_find(gpio, 0, power_checks[i],
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+					     DCB_GPIO_UNUSED, &func);
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+			if (ret)
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+				continue;
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+
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+			ret = nvkm_gpio_get(gpio, 0, func.func, func.line);
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+			if (!ret)
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+				continue;
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+
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+			nvkm_error(&gpio->subdev,
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+				   "GPU is missing power, check its power "
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+				   "cables.  Boot with "
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+				   "nouveau.config=NvPowerChecks=0 to "
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+				   "disable.\n");
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+			return -EINVAL;
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+		}
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+	}
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+
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 	return 0;
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 }
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