drm/i915: Move the dg2 fixed_enable_delay power well param to a common bitfield

The DG2 fixed delay duration is always 600usec, so save some space in
the power well descriptors by converting the parameter to a flag. While
at it also use a bitfield for both the always_on and fixed_enable_delay
flag.

This change also lets simplifying the definiton of power wells sharing
the same flags in an upcoming patch.
Signed-off-by: Imre Deak <imre.deak@intel.com>
Reviewed-by: Jouni Högander <jouni.hogander@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220414210657.1785773-4-imre.deak@intel.com

drivers/gpu/drm/i915/display/intel_display_power_map.c

@@ -1920,37 +1920,37 @@ static const struct i915_power_well_desc xelpd_power_wells[] = {
 		.name = "AUX A",
 		.domains = ICL_AUX_A_IO_POWER_DOMAINS,
 		.ops = &icl_aux_power_well_ops,
+		.fixed_enable_delay = true,
 		.id = DISP_PW_ID_NONE,
 		{
 			.hsw.idx = ICL_PW_CTL_IDX_AUX_A,
-			.hsw.fixed_enable_delay = 600,
 		},
 	}, {
 		.name = "AUX B",
 		.domains = ICL_AUX_B_IO_POWER_DOMAINS,
 		.ops = &icl_aux_power_well_ops,
+		.fixed_enable_delay = true,
 		.id = DISP_PW_ID_NONE,
 		{
 			.hsw.idx = ICL_PW_CTL_IDX_AUX_B,
-			.hsw.fixed_enable_delay = 600,
 		},
 	}, {
 		.name = "AUX C",
 		.domains = TGL_AUX_C_IO_POWER_DOMAINS,
 		.ops = &icl_aux_power_well_ops,
+		.fixed_enable_delay = true,
 		.id = DISP_PW_ID_NONE,
 		{
 			.hsw.idx = ICL_PW_CTL_IDX_AUX_C,
-			.hsw.fixed_enable_delay = 600,
 		},
 	}, {
 		.name = "AUX D_XELPD",
 		.domains = XELPD_AUX_IO_D_XELPD_POWER_DOMAINS,
 		.ops = &icl_aux_power_well_ops,
+		.fixed_enable_delay = true,
 		.id = DISP_PW_ID_NONE,
 		{
 			.hsw.idx = XELPD_PW_CTL_IDX_AUX_D,
-			.hsw.fixed_enable_delay = 600,
 		},
 	}, {
 		.name = "AUX E_XELPD",
@@ -1964,10 +1964,10 @@ static const struct i915_power_well_desc xelpd_power_wells[] = {
 		.name = "AUX USBC1",
 		.domains = XELPD_AUX_IO_USBC1_POWER_DOMAINS,
 		.ops = &icl_aux_power_well_ops,
+		.fixed_enable_delay = true,
 		.id = DISP_PW_ID_NONE,
 		{
 			.hsw.idx = TGL_PW_CTL_IDX_AUX_TC1,
-			.hsw.fixed_enable_delay = 600,
 		},
 	}, {
 		.name = "AUX USBC2",

drivers/gpu/drm/i915/display/intel_display_power_well.c

@@ -243,15 +243,14 @@ static void hsw_wait_for_power_well_enable(struct drm_i915_private *dev_priv,
 {
 	const struct i915_power_well_regs *regs = power_well->desc->ops->regs;
 	int pw_idx = power_well->desc->hsw.idx;
-	int enable_delay = power_well->desc->hsw.fixed_enable_delay;
 
 	/*
 	 * For some power wells we're not supposed to watch the status bit for
 	 * an ack, but rather just wait a fixed amount of time and then
 	 * proceed.  This is only used on DG2.
 	 */
-	if (IS_DG2(dev_priv) && enable_delay) {
-		usleep_range(enable_delay, 2 * enable_delay);
+	if (IS_DG2(dev_priv) && power_well->desc->fixed_enable_delay) {
+		usleep_range(600, 1200);
 		return;
 	}
 

drivers/gpu/drm/i915/display/intel_display_power_well.h

@@ -50,8 +50,14 @@ enum i915_power_well_id {
 
 struct i915_power_well_desc {
 	const char *name;
-	bool always_on;
 	u64 domains;
+	u8 always_on:1;
+	/*
+	 * Instead of waiting for the status bit to ack enables,
+	 * just wait a specific amount of time and then consider
+	 * the well enabled.
+	 */
+	u8 fixed_enable_delay:1;
 	/* unique identifier for this power well */
 	enum i915_power_well_id id;
 	/*
@@ -77,12 +83,6 @@ struct i915_power_well_desc {
 			u8 idx;
 			/* Mask of pipes whose IRQ logic is backed by the pw */
 			u8 irq_pipe_mask;
-			/*
-			 * Instead of waiting for the status bit to ack enables,
-			 * just wait a specific amount of time and then consider
-			 * the well enabled.
-			 */
-			u16 fixed_enable_delay;
 			/* The pw is backing the VGA functionality */
 			bool has_vga:1;
 			bool has_fuses:1;