drm/i915/vlv: Use power well CTL IDX instead of ID

Atm, we determine the control/status flag offsets within the PUNIT
control/status registers based on the power well's ID. Since the power
well ID enum is global across all platforms, the associated macros to
get the flag offsets involves some magic. This makes checking the
register/bit definitions against the specification more difficult than
necessary. Also the values in the power well ID enum must stay fixed,
making code maintenance of the enum cumbersome.

To solve the above define the control/status flag indices right after
the corresponding registers and use these to derive the control/status
flag values by storing the indices in the i915_power_well_desc struct.

Initializing anonymous union fields require the preceding field in the
struct to be explicitly initialized - even when using named
initializers - and the initialization to be done right before the union
initialization, hence the reordering of the .id fields.

v2:
- Clarify commit log message about anonymous union initializers. (Paulo)

Cc: Ville Syrjala <ville.syrjala@linux.intel.com>
Cc: Paulo Zanoni <paulo.r.zanoni@intel.com>
Cc: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Imre Deak <imre.deak@intel.com>
Reviewed-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180806095843.13294-6-imre.deak@intel.com

drivers/gpu/drm/i915/i915_drv.h

@@ -879,6 +879,13 @@ struct i915_power_well_desc {
 	 * well specific.
 	 */
 	union {
+		struct {
+			/*
+			 * request/status flag index in the PUNIT power well
+			 * control/status registers.
+			 */
+			u8 idx;
+		} vlv;
 		struct {
 			enum dpio_phy phy;
 		} bxt;

drivers/gpu/drm/i915/i915_reg.h

@@ -1144,11 +1144,23 @@ enum i915_power_well_id {
 
 #define PUNIT_REG_PWRGT_CTRL			0x60
 #define PUNIT_REG_PWRGT_STATUS			0x61
-#define   PUNIT_PWRGT_MASK(power_well)		(3 << ((power_well) * 2))
-#define   PUNIT_PWRGT_PWR_ON(power_well)	(0 << ((power_well) * 2))
-#define   PUNIT_PWRGT_CLK_GATE(power_well)	(1 << ((power_well) * 2))
-#define   PUNIT_PWRGT_RESET(power_well)		(2 << ((power_well) * 2))
-#define   PUNIT_PWRGT_PWR_GATE(power_well)	(3 << ((power_well) * 2))
+#define   PUNIT_PWRGT_MASK(pw_idx)		(3 << ((pw_idx) * 2))
+#define   PUNIT_PWRGT_PWR_ON(pw_idx)		(0 << ((pw_idx) * 2))
+#define   PUNIT_PWRGT_CLK_GATE(pw_idx)		(1 << ((pw_idx) * 2))
+#define   PUNIT_PWRGT_RESET(pw_idx)		(2 << ((pw_idx) * 2))
+#define   PUNIT_PWRGT_PWR_GATE(pw_idx)		(3 << ((pw_idx) * 2))
+
+#define PUNIT_PWGT_IDX_RENDER			0
+#define PUNIT_PWGT_IDX_MEDIA			1
+#define PUNIT_PWGT_IDX_DISP2D			3
+#define PUNIT_PWGT_IDX_DPIO_CMN_BC		5
+#define PUNIT_PWGT_IDX_DPIO_TX_B_LANES_01	6
+#define PUNIT_PWGT_IDX_DPIO_TX_B_LANES_23	7
+#define PUNIT_PWGT_IDX_DPIO_TX_C_LANES_01	8
+#define PUNIT_PWGT_IDX_DPIO_TX_C_LANES_23	9
+#define PUNIT_PWGT_IDX_DPIO_RX0			10
+#define PUNIT_PWGT_IDX_DPIO_RX1			11
+#define PUNIT_PWGT_IDX_DPIO_CMN_D		12
 
 #define PUNIT_REG_GPU_LFM			0xd3
 #define PUNIT_REG_GPU_FREQ_REQ			0xd4

drivers/gpu/drm/i915/intel_runtime_pm.c

@@ -872,14 +872,14 @@ static void i830_pipes_power_well_sync_hw(struct drm_i915_private *dev_priv,
 static void vlv_set_power_well(struct drm_i915_private *dev_priv,
 			       struct i915_power_well *power_well, bool enable)
 {
-	enum i915_power_well_id power_well_id = power_well->desc->id;
+	int pw_idx = power_well->desc->vlv.idx;
 	u32 mask;
 	u32 state;
 	u32 ctrl;
 
-	mask = PUNIT_PWRGT_MASK(power_well_id);
-	state = enable ? PUNIT_PWRGT_PWR_ON(power_well_id) :
-			 PUNIT_PWRGT_PWR_GATE(power_well_id);
+	mask = PUNIT_PWRGT_MASK(pw_idx);
+	state = enable ? PUNIT_PWRGT_PWR_ON(pw_idx) :
+			 PUNIT_PWRGT_PWR_GATE(pw_idx);
 
 	mutex_lock(&dev_priv->pcu_lock);
 
@@ -920,14 +920,14 @@ static void vlv_power_well_disable(struct drm_i915_private *dev_priv,
 static bool vlv_power_well_enabled(struct drm_i915_private *dev_priv,
 				   struct i915_power_well *power_well)
 {
-	enum i915_power_well_id power_well_id = power_well->desc->id;
+	int pw_idx = power_well->desc->vlv.idx;
 	bool enabled = false;
 	u32 mask;
 	u32 state;
 	u32 ctrl;
 
-	mask = PUNIT_PWRGT_MASK(power_well_id);
-	ctrl = PUNIT_PWRGT_PWR_ON(power_well_id);
+	mask = PUNIT_PWRGT_MASK(pw_idx);
+	ctrl = PUNIT_PWRGT_PWR_ON(pw_idx);
 
 	mutex_lock(&dev_priv->pcu_lock);
 
@@ -936,8 +936,8 @@ static bool vlv_power_well_enabled(struct drm_i915_private *dev_priv,
 	 * We only ever set the power-on and power-gate states, anything
 	 * else is unexpected.
 	 */
-	WARN_ON(state != PUNIT_PWRGT_PWR_ON(power_well_id) &&
-		state != PUNIT_PWRGT_PWR_GATE(power_well_id));
+	WARN_ON(state != PUNIT_PWRGT_PWR_ON(pw_idx) &&
+		state != PUNIT_PWRGT_PWR_GATE(pw_idx));
 	if (state == ctrl)
 		enabled = true;
 
@@ -2179,8 +2179,11 @@ static const struct i915_power_well_desc vlv_power_wells[] = {
 	{
 		.name = "display",
 		.domains = VLV_DISPLAY_POWER_DOMAINS,
-		.id = PUNIT_POWER_WELL_DISP2D,
 		.ops = &vlv_display_power_well_ops,
+		.id = PUNIT_POWER_WELL_DISP2D,
+		{
+			.vlv.idx = PUNIT_PWGT_IDX_DISP2D,
+		},
 	},
 	{
 		.name = "dpio-tx-b-01",
@@ -2190,6 +2193,9 @@ static const struct i915_power_well_desc vlv_power_wells[] = {
 			   VLV_DPIO_TX_C_LANES_23_POWER_DOMAINS,
 		.ops = &vlv_dpio_power_well_ops,
 		.id = PUNIT_POWER_WELL_DPIO_TX_B_LANES_01,
+		{
+			.vlv.idx = PUNIT_PWGT_IDX_DPIO_TX_B_LANES_01,
+		},
 	},
 	{
 		.name = "dpio-tx-b-23",
@@ -2199,6 +2205,9 @@ static const struct i915_power_well_desc vlv_power_wells[] = {
 			   VLV_DPIO_TX_C_LANES_23_POWER_DOMAINS,
 		.ops = &vlv_dpio_power_well_ops,
 		.id = PUNIT_POWER_WELL_DPIO_TX_B_LANES_23,
+		{
+			.vlv.idx = PUNIT_PWGT_IDX_DPIO_TX_B_LANES_23,
+		},
 	},
 	{
 		.name = "dpio-tx-c-01",
@@ -2208,6 +2217,9 @@ static const struct i915_power_well_desc vlv_power_wells[] = {
 			   VLV_DPIO_TX_C_LANES_23_POWER_DOMAINS,
 		.ops = &vlv_dpio_power_well_ops,
 		.id = PUNIT_POWER_WELL_DPIO_TX_C_LANES_01,
+		{
+			.vlv.idx = PUNIT_PWGT_IDX_DPIO_TX_C_LANES_01,
+		},
 	},
 	{
 		.name = "dpio-tx-c-23",
@@ -2217,12 +2229,18 @@ static const struct i915_power_well_desc vlv_power_wells[] = {
 			   VLV_DPIO_TX_C_LANES_23_POWER_DOMAINS,
 		.ops = &vlv_dpio_power_well_ops,
 		.id = PUNIT_POWER_WELL_DPIO_TX_C_LANES_23,
+		{
+			.vlv.idx = PUNIT_PWGT_IDX_DPIO_TX_C_LANES_23,
+		},
 	},
 	{
 		.name = "dpio-common",
 		.domains = VLV_DPIO_CMN_BC_POWER_DOMAINS,
-		.id = PUNIT_POWER_WELL_DPIO_CMN_BC,
 		.ops = &vlv_dpio_cmn_power_well_ops,
+		.id = PUNIT_POWER_WELL_DPIO_CMN_BC,
+		{
+			.vlv.idx = PUNIT_PWGT_IDX_DPIO_CMN_BC,
+		},
 	},
 };
 
@@ -2242,20 +2260,26 @@ static const struct i915_power_well_desc chv_power_wells[] = {
 		 * required for any pipe to work.
 		 */
 		.domains = CHV_DISPLAY_POWER_DOMAINS,
-		.id = CHV_DISP_PW_PIPE_A,
 		.ops = &chv_pipe_power_well_ops,
+		.id = CHV_DISP_PW_PIPE_A,
 	},
 	{
 		.name = "dpio-common-bc",
 		.domains = CHV_DPIO_CMN_BC_POWER_DOMAINS,
-		.id = PUNIT_POWER_WELL_DPIO_CMN_BC,
 		.ops = &chv_dpio_cmn_power_well_ops,
+		.id = PUNIT_POWER_WELL_DPIO_CMN_BC,
+		{
+			.vlv.idx = PUNIT_PWGT_IDX_DPIO_CMN_BC,
+		},
 	},
 	{
 		.name = "dpio-common-d",
 		.domains = CHV_DPIO_CMN_D_POWER_DOMAINS,
-		.id = PUNIT_POWER_WELL_DPIO_CMN_D,
 		.ops = &chv_dpio_cmn_power_well_ops,
+		.id = PUNIT_POWER_WELL_DPIO_CMN_D,
+		{
+			.vlv.idx = PUNIT_PWGT_IDX_DPIO_CMN_D,
+		},
 	},
 };