[Intel-gfx] [PATCH v2 13/18] drm/i915/hsw, bdw: Add irq_pipe_mask, has_vga power well attributes

[Imre Deak]

The pattern of a power well backing a set of pipe IRQ or VGA
functionality applies to all HSW+ platforms. Using power well attributes
instead of platform checks to decide whether to init/reset pipe IRQs and
VGA correspondingly is cleaner and it allows us to unify the HSW/BDW and
GEN9+ power well code in follow-up patches.

v2:
- Use u8 instead of u32 for irq_pipe_mask. (Ville)

Signed-off-by: Imre Deak <imre.deak at intel.com>
---
 drivers/gpu/drm/i915/i915_drv.h         |  6 ++++++
 drivers/gpu/drm/i915/intel_runtime_pm.c | 34 ++++++++++++++++++++-------------
 2 files changed, 27 insertions(+), 13 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index b27f2fcc0ad3..6f28fbe1de0f 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -1391,6 +1391,12 @@ struct i915_power_well {
 		struct {
 			enum dpio_phy phy;
 		} bxt;
+		struct {
+			/* Mask of pipes whose IRQ logic is backed by the pw */
+			u8 irq_pipe_mask;
+			/* The pw is backing the VGA functionality */
+			bool has_vga:1;
+		} hsw;
 	};
 	const struct i915_power_well_ops *ops;
 };
diff --git a/drivers/gpu/drm/i915/intel_runtime_pm.c b/drivers/gpu/drm/i915/intel_runtime_pm.c
index 5143a7302d54..aac697dcb87b 100644
--- a/drivers/gpu/drm/i915/intel_runtime_pm.c
+++ b/drivers/gpu/drm/i915/intel_runtime_pm.c
@@ -281,7 +281,8 @@ void intel_display_set_init_power(struct drm_i915_private *dev_priv,
  * to be enabled, and it will only be disabled if none of the registers is
  * requesting it to be enabled.
  */
-static void hsw_power_well_post_enable(struct drm_i915_private *dev_priv)
+static void hsw_power_well_post_enable(struct drm_i915_private *dev_priv,
+				       u32 irq_pipe_mask, bool has_vga)
 {
 	struct pci_dev *pdev = dev_priv->drm.pdev;
 
@@ -295,20 +296,21 @@ static void hsw_power_well_post_enable(struct drm_i915_private *dev_priv)
 	 * sure vgacon can keep working normally without triggering interrupts
 	 * and error messages.
 	 */
-	vga_get_uninterruptible(pdev, VGA_RSRC_LEGACY_IO);
-	outb(inb(VGA_MSR_READ), VGA_MSR_WRITE);
-	vga_put(pdev, VGA_RSRC_LEGACY_IO);
+	if (has_vga) {
+		vga_get_uninterruptible(pdev, VGA_RSRC_LEGACY_IO);
+		outb(inb(VGA_MSR_READ), VGA_MSR_WRITE);
+		vga_put(pdev, VGA_RSRC_LEGACY_IO);
+	}
 
-	if (IS_BROADWELL(dev_priv))
-		gen8_irq_power_well_post_enable(dev_priv,
-						1 << PIPE_C | 1 << PIPE_B);
+	if (irq_pipe_mask)
+		gen8_irq_power_well_post_enable(dev_priv, irq_pipe_mask);
 }
 
-static void hsw_power_well_pre_disable(struct drm_i915_private *dev_priv)
+static void hsw_power_well_pre_disable(struct drm_i915_private *dev_priv,
+				       u32 irq_pipe_mask)
 {
-	if (IS_BROADWELL(dev_priv))
-		gen8_irq_power_well_pre_disable(dev_priv,
-						1 << PIPE_C | 1 << PIPE_B);
+	if (irq_pipe_mask)
+		gen8_irq_power_well_pre_disable(dev_priv, irq_pipe_mask);
 }
 
 static void skl_power_well_post_enable(struct drm_i915_private *dev_priv,
@@ -413,7 +415,9 @@ static void hsw_power_well_enable(struct drm_i915_private *dev_priv,
 				    HSW_PWR_WELL_CTL_STATE(id),
 				    20))
 		DRM_ERROR("Timeout enabling power well\n");
-	hsw_power_well_post_enable(dev_priv);
+
+	hsw_power_well_post_enable(dev_priv, power_well->hsw.irq_pipe_mask,
+				   power_well->hsw.has_vga);
 }
 
 static void hsw_power_well_disable(struct drm_i915_private *dev_priv,
@@ -422,7 +426,8 @@ static void hsw_power_well_disable(struct drm_i915_private *dev_priv,
 	enum i915_power_well_id id = power_well->id;
 	u32 val;
 
-	hsw_power_well_pre_disable(dev_priv);
+	hsw_power_well_pre_disable(dev_priv, power_well->hsw.irq_pipe_mask);
+
 	val = I915_READ(HSW_PWR_WELL_DRIVER);
 	I915_WRITE(HSW_PWR_WELL_DRIVER, val & ~HSW_PWR_WELL_CTL_REQ(id));
 	POSTING_READ(HSW_PWR_WELL_DRIVER);
@@ -2057,6 +2062,7 @@ static struct i915_power_well hsw_power_wells[] = {
 		.domains = HSW_DISPLAY_POWER_DOMAINS,
 		.ops = &hsw_power_well_ops,
 		.id = HSW_DISP_PW_GLOBAL,
+		.hsw.has_vga = true,
 	},
 };
 
@@ -2073,6 +2079,8 @@ static struct i915_power_well bdw_power_wells[] = {
 		.domains = BDW_DISPLAY_POWER_DOMAINS,
 		.ops = &hsw_power_well_ops,
 		.id = HSW_DISP_PW_GLOBAL,
+		.hsw.irq_pipe_mask = BIT(PIPE_B) | BIT(PIPE_C),
+		.hsw.has_vga = true,
 	},
 };
 
-- 
2.11.0