drm/radeon/kms: pull power mode info from bios tables (v3)

The general idea is to validate the current hw state
against the set of power states and select a power
state based on that.  This patch just pulls the power
states from the bios and prints the information.  It
is not currently hooked up in the actual power management
code.  Hooking it up will require reworking the the current
power state selection code and will be handled in a future
patch.

Additionally, we'd need to decide on some default lower
power states for cards without power tables.

v2 - increment state_index after checking for default state
v3 - fix typo in pm init on pre-atom cards, handle pre-atom
cards without x86 bioses

Signed-off-by: Alex Deucher <alexdeucher@gmail.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

1 files changed, 108 insertions, 0 deletions

diff --git a/drivers/gpu/drm/radeon/radeon_combios.c b/drivers/gpu/drm/radeon/radeon_combios.c
index 257ce1774e4..eac2174abc5 100644
--- a/drivers/gpu/drm/radeon/radeon_combios.c
+++ b/drivers/gpu/drm/radeon/radeon_combios.c
@@ -2374,6 +2374,114 @@ bool radeon_get_legacy_connector_info_from_bios(struct drm_device *dev)
 	return true;
 }
 
+void radeon_combios_get_power_modes(struct radeon_device *rdev)
+{
+	struct drm_device *dev = rdev->ddev;
+	u16 offset, misc, misc2 = 0;
+	u8 rev, blocks, tmp;
+	int state_index = 0;
+
+	rdev->pm.default_power_state = NULL;
+	rdev->pm.current_power_state = NULL;
+
+	/* XXX mac/sparc cards */
+	if (rdev->bios == NULL)
+		goto default_mode;
+
+	if (rdev->flags & RADEON_IS_MOBILITY) {
+		offset = combios_get_table_offset(dev, COMBIOS_POWERPLAY_INFO_TABLE);
+		if (offset) {
+			rev = RBIOS8(offset);
+			blocks = RBIOS8(offset + 0x2);
+			/* power mode 0 tends to be the only valid one */
+			rdev->pm.power_state[state_index].num_clock_modes = 1;
+			rdev->pm.power_state[state_index].clock_info[0].mclk = RBIOS32(offset + 0x5 + 0x2);
+			rdev->pm.power_state[state_index].clock_info[0].sclk = RBIOS32(offset + 0x5 + 0x6);
+			if ((rdev->pm.power_state[state_index].clock_info[0].mclk == 0) ||
+			    (rdev->pm.power_state[state_index].clock_info[0].sclk == 0))
+				goto default_mode;
+			/* skip overclock modes for now */
+			if ((rdev->pm.power_state[state_index].clock_info[0].mclk >
+			     rdev->clock.default_mclk) ||
+			    (rdev->pm.power_state[state_index].clock_info[0].sclk >
+			     rdev->clock.default_sclk))
+				goto default_mode;
+			misc = RBIOS16(offset + 0x5 + 0x0);
+			if (rev > 4)
+				misc2 = RBIOS16(offset + 0x5 + 0xe);
+			if (misc & 0x4) {
+				rdev->pm.power_state[state_index].clock_info[0].voltage.type = VOLTAGE_GPIO;
+				if (misc & 0x8)
+					rdev->pm.power_state[state_index].clock_info[0].voltage.active_high =
+						true;
+				else
+					rdev->pm.power_state[state_index].clock_info[0].voltage.active_high =
+						false;
+				rdev->pm.power_state[state_index].clock_info[0].voltage.gpio.valid = true;
+				if (rev < 6) {
+					rdev->pm.power_state[state_index].clock_info[0].voltage.gpio.reg =
+						RBIOS16(offset + 0x5 + 0xb) * 4;
+					tmp = RBIOS8(offset + 0x5 + 0xd);
+					rdev->pm.power_state[state_index].clock_info[0].voltage.gpio.mask = (1 << tmp);
+				} else {
+					u8 entries = RBIOS8(offset + 0x5 + 0xb);
+					u16 voltage_table_offset = RBIOS16(offset + 0x5 + 0xc);
+					if (entries && voltage_table_offset) {
+						rdev->pm.power_state[state_index].clock_info[0].voltage.gpio.reg =
+							RBIOS16(voltage_table_offset) * 4;
+						tmp = RBIOS8(voltage_table_offset + 0x2);
+						rdev->pm.power_state[state_index].clock_info[0].voltage.gpio.mask = (1 << tmp);
+					} else
+						rdev->pm.power_state[state_index].clock_info[0].voltage.gpio.valid = false;
+				}
+				switch ((misc2 & 0x700) >> 8) {
+				case 0:
+				default:
+					rdev->pm.power_state[state_index].clock_info[0].voltage.delay = 0;
+					break;
+				case 1:
+					rdev->pm.power_state[state_index].clock_info[0].voltage.delay = 33;
+					break;
+				case 2:
+					rdev->pm.power_state[state_index].clock_info[0].voltage.delay = 66;
+					break;
+				case 3:
+					rdev->pm.power_state[state_index].clock_info[0].voltage.delay = 99;
+					break;
+				case 4:
+					rdev->pm.power_state[state_index].clock_info[0].voltage.delay = 132;
+					break;
+				}
+			} else
+				rdev->pm.power_state[state_index].clock_info[0].voltage.type = VOLTAGE_NONE;
+			if (rev > 6)
+				rdev->pm.power_state[state_index].non_clock_info.pcie_lanes =
+					RBIOS8(offset + 0x5 + 0x10);
+			state_index++;
+		} else {
+			/* XXX figure out some good default low power mode for mobility cards w/out power tables */
+		}
+	} else {
+		/* XXX figure out some good default low power mode for desktop cards */
+	}
+
+default_mode:
+	/* add the default mode */
+	rdev->pm.power_state[state_index].num_clock_modes = 1;
+	rdev->pm.power_state[state_index].clock_info[0].mclk = rdev->clock.default_mclk;
+	rdev->pm.power_state[state_index].clock_info[0].sclk = rdev->clock.default_sclk;
+	rdev->pm.power_state[state_index].default_clock_mode = &rdev->pm.power_state[state_index].clock_info[0];
+	rdev->pm.power_state[state_index].current_clock_mode = &rdev->pm.power_state[state_index].clock_info[0];
+	rdev->pm.power_state[state_index].clock_info[0].voltage.type = VOLTAGE_NONE;
+	if (rdev->asic->get_pcie_lanes)
+		rdev->pm.power_state[state_index].non_clock_info.pcie_lanes = radeon_get_pcie_lanes(rdev);
+	else
+		rdev->pm.power_state[state_index].non_clock_info.pcie_lanes = 16;
+	rdev->pm.default_power_state = &rdev->pm.power_state[state_index];
+	rdev->pm.current_power_state = &rdev->pm.power_state[state_index];
+	rdev->pm.num_power_states = state_index + 1;
+}
+
 void radeon_external_tmds_setup(struct drm_encoder *encoder)
 {
 	struct radeon_encoder *radeon_encoder = to_radeon_encoder(encoder);