drm/nouveau/gpio: expose the PWM/TOGGLE parameter found in the gpio vbios table

Signed-off-by: Martin Peres <martin.peres@labri.fr>
Reviewed-by: Ben Skeggs <bskeggs@redhat.com>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

drivers/gpu/drm/nouveau/core/include/subdev/bios/gpio.h

@@ -16,6 +16,13 @@ struct dcb_gpio_func {
 	u8 func;
 	u8 line;
 	u8 log[2];
+
+	/* so far, "param" seems to only have an influence on PWM-related
+	 * GPIOs such as FAN_CONTROL and PANEL_BACKLIGHT_LEVEL.
+	 * if param equals 1, hardware PWM is available
+	 * if param equals 0, the host should toggle the GPIO itself
+	 */
+	u8 param;
 };
 
 u16 dcb_gpio_table(struct nouveau_bios *);

drivers/gpu/drm/nouveau/core/subdev/bios/gpio.c

@@ -71,6 +71,7 @@ dcb_gpio_parse(struct nouveau_bios *bios, int idx, u8 func, u8 line,
 				.func = (data & 0x07e0) >> 5,
 				.log[0] = (data & 0x1800) >> 11,
 				.log[1] = (data & 0x6000) >> 13,
+				.param = !!(data & 0x8000),
 			};
 		} else
 		if (ver < 0x41) {
@@ -80,6 +81,7 @@ dcb_gpio_parse(struct nouveau_bios *bios, int idx, u8 func, u8 line,
 				.func = (data & 0x0000ff00) >> 8,
 				.log[0] = (data & 0x18000000) >> 27,
 				.log[1] = (data & 0x60000000) >> 29,
+				.param = !!(data & 0x80000000),
 			};
 		} else {
 			u32 data = nv_ro32(bios, entry + 0);
@@ -89,6 +91,7 @@ dcb_gpio_parse(struct nouveau_bios *bios, int idx, u8 func, u8 line,
 				.func = (data & 0x0000ff00) >> 8,
 				.log[0] = (data1 & 0x30) >> 4,
 				.log[1] = (data1 & 0xc0) >> 6,
+				.param = !!(data & 0x80000000),
 			};
 		}