drm/i915: Clean up PCI config register handling

Do not use magic numbers, do not prefix stuff with "PCI_", do not
declare registers in implementation files. Also move the PCI
registers under correct comment in i915_reg.h.

v2:
- Consistently use BSM (not BDSM or other variants from PRM) (Chris)
- Also include register address to help identify the register (Chris)
v3:
- Refer to register value as *_val instead of *_reg (Chris)
v4:
- Make style checker happy

Cc: Jani Nikula <jani.nikula@intel.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>

drivers/gpu/drm/i915/i915_dma.c

@@ -257,13 +257,6 @@ static int i915_get_bridge_dev(struct drm_device *dev)
 	return 0;
 }
 
-#define MCHBAR_I915 0x44
-#define MCHBAR_I965 0x48
-#define MCHBAR_SIZE (4*4096)
-
-#define DEVEN_REG 0x54
-#define   DEVEN_MCHBAR_EN (1 << 28)
-
 /* Allocate space for the MCH regs if needed, return nonzero on error */
 static int
 intel_alloc_mchbar_resource(struct drm_device *dev)
@@ -325,7 +318,7 @@ intel_setup_mchbar(struct drm_device *dev)
 	dev_priv->mchbar_need_disable = false;
 
 	if (IS_I915G(dev) || IS_I915GM(dev)) {
-		pci_read_config_dword(dev_priv->bridge_dev, DEVEN_REG, &temp);
+		pci_read_config_dword(dev_priv->bridge_dev, DEVEN, &temp);
 		enabled = !!(temp & DEVEN_MCHBAR_EN);
 	} else {
 		pci_read_config_dword(dev_priv->bridge_dev, mchbar_reg, &temp);
@@ -343,7 +336,7 @@ intel_setup_mchbar(struct drm_device *dev)
 
 	/* Space is allocated or reserved, so enable it. */
 	if (IS_I915G(dev) || IS_I915GM(dev)) {
-		pci_write_config_dword(dev_priv->bridge_dev, DEVEN_REG,
+		pci_write_config_dword(dev_priv->bridge_dev, DEVEN,
 				       temp | DEVEN_MCHBAR_EN);
 	} else {
 		pci_read_config_dword(dev_priv->bridge_dev, mchbar_reg, &temp);
@@ -356,17 +349,24 @@ intel_teardown_mchbar(struct drm_device *dev)
 {
 	struct drm_i915_private *dev_priv = dev->dev_private;
 	int mchbar_reg = INTEL_INFO(dev)->gen >= 4 ? MCHBAR_I965 : MCHBAR_I915;
-	u32 temp;
 
 	if (dev_priv->mchbar_need_disable) {
 		if (IS_I915G(dev) || IS_I915GM(dev)) {
-			pci_read_config_dword(dev_priv->bridge_dev, DEVEN_REG, &temp);
-			temp &= ~DEVEN_MCHBAR_EN;
-			pci_write_config_dword(dev_priv->bridge_dev, DEVEN_REG, temp);
+			u32 deven_val;
+
+			pci_read_config_dword(dev_priv->bridge_dev, DEVEN,
+					      &deven_val);
+			deven_val &= ~DEVEN_MCHBAR_EN;
+			pci_write_config_dword(dev_priv->bridge_dev, DEVEN,
+					       deven_val);
 		} else {
-			pci_read_config_dword(dev_priv->bridge_dev, mchbar_reg, &temp);
-			temp &= ~1;
-			pci_write_config_dword(dev_priv->bridge_dev, mchbar_reg, temp);
+			u32 mchbar_val;
+
+			pci_read_config_dword(dev_priv->bridge_dev, mchbar_reg,
+					      &mchbar_val);
+			mchbar_val &= ~1;
+			pci_write_config_dword(dev_priv->bridge_dev, mchbar_reg,
+					       mchbar_val);
 		}
 	}
 

drivers/gpu/drm/i915/i915_gem_stolen.c

@@ -95,9 +95,9 @@ static unsigned long i915_stolen_to_physical(struct drm_device *dev)
 	u32 base;
 
 	/* Almost universally we can find the Graphics Base of Stolen Memory
-	 * at offset 0x5c in the igfx configuration space. On a few (desktop)
-	 * machines this is also mirrored in the bridge device at different
-	 * locations, or in the MCHBAR.
+	 * at register BSM (0x5c) in the igfx configuration space. On a few
+	 * (desktop) machines this is also mirrored in the bridge device at
+	 * different locations, or in the MCHBAR.
 	 *
 	 * On 865 we just check the TOUD register.
 	 *
@@ -107,9 +107,11 @@ static unsigned long i915_stolen_to_physical(struct drm_device *dev)
 	 */
 	base = 0;
 	if (INTEL_INFO(dev)->gen >= 3) {
-		/* Read Graphics Base of Stolen Memory directly */
-		pci_read_config_dword(dev->pdev, 0x5c, &base);
-		base &= ~((1<<20) - 1);
+		u32 bsm;
+
+		pci_read_config_dword(dev->pdev, BSM, &bsm);
+
+		base = bsm & BSM_MASK;
 	} else if (IS_I865G(dev)) {
 		u16 toud = 0;
 

drivers/gpu/drm/i915/i915_reg.h

@@ -79,6 +79,16 @@ static inline bool i915_mmio_reg_valid(i915_reg_t reg)
 
 /* PCI config space */
 
+#define MCHBAR_I915 0x44
+#define MCHBAR_I965 0x48
+#define MCHBAR_SIZE (4 * 4096)
+
+#define DEVEN 0x54
+#define   DEVEN_MCHBAR_EN (1 << 28)
+
+#define BSM 0x5c
+#define   BSM_MASK (0xFFFF << 20)
+
 #define HPLLCC	0xc0 /* 85x only */
 #define   GC_CLOCK_CONTROL_MASK		(0x7 << 0)
 #define   GC_CLOCK_133_200		(0 << 0)
@@ -90,6 +100,16 @@ static inline bool i915_mmio_reg_valid(i915_reg_t reg)
 #define   GC_CLOCK_166_266		(6 << 0)
 #define   GC_CLOCK_166_250		(7 << 0)
 
+#define I915_GDRST 0xc0 /* PCI config register */
+#define   GRDOM_FULL		(0 << 2)
+#define   GRDOM_RENDER		(1 << 2)
+#define   GRDOM_MEDIA		(3 << 2)
+#define   GRDOM_MASK		(3 << 2)
+#define   GRDOM_RESET_STATUS	(1 << 1)
+#define   GRDOM_RESET_ENABLE	(1 << 0)
+
+#define GCDGMBUS 0xcc
+
 #define GCFGC2	0xda
 #define GCFGC	0xf0 /* 915+ only */
 #define   GC_LOW_FREQUENCY_ENABLE	(1 << 7)
@@ -121,18 +141,16 @@ static inline bool i915_mmio_reg_valid(i915_reg_t reg)
 #define   I915_GC_RENDER_CLOCK_166_MHZ	(0 << 0)
 #define   I915_GC_RENDER_CLOCK_200_MHZ	(1 << 0)
 #define   I915_GC_RENDER_CLOCK_333_MHZ	(4 << 0)
-#define GCDGMBUS 0xcc
-#define PCI_LBPC 0xf4 /* legacy/combination backlight modes, also called LBB */
 
+#define ASLE	0xe4
+#define ASLS	0xfc
+
+#define SWSCI	0xe8
+#define   SWSCI_SCISEL	(1 << 15)
+#define   SWSCI_GSSCIE	(1 << 0)
+
+#define LBPC 0xf4 /* legacy/combination backlight modes, also called LBB */
 
-/* Graphics reset regs */
-#define I915_GDRST 0xc0 /* PCI config register */
-#define  GRDOM_FULL	(0<<2)
-#define  GRDOM_RENDER	(1<<2)
-#define  GRDOM_MEDIA	(3<<2)
-#define  GRDOM_MASK	(3<<2)
-#define  GRDOM_RESET_STATUS (1<<1)
-#define  GRDOM_RESET_ENABLE (1<<0)
 
 #define ILK_GDSR _MMIO(MCHBAR_MIRROR_BASE + 0x2ca4)
 #define  ILK_GRDOM_FULL		(0<<1)

drivers/gpu/drm/i915/intel_opregion.c

@@ -34,12 +34,6 @@
 #include "i915_drv.h"
 #include "intel_drv.h"
 
-#define PCI_ASLE		0xe4
-#define PCI_ASLS		0xfc
-#define PCI_SWSCI		0xe8
-#define PCI_SWSCI_SCISEL	(1 << 15)
-#define PCI_SWSCI_GSSCIE	(1 << 0)
-
 #define OPREGION_HEADER_OFFSET 0
 #define OPREGION_ACPI_OFFSET   0x100
 #define   ACPI_CLID 0x01ac /* current lid state indicator */
@@ -251,7 +245,7 @@ static int swsci(struct drm_device *dev, u32 function, u32 parm, u32 *parm_out)
 	struct drm_i915_private *dev_priv = dev->dev_private;
 	struct opregion_swsci *swsci = dev_priv->opregion.swsci;
 	u32 main_function, sub_function, scic;
-	u16 pci_swsci;
+	u16 swsci_val;
 	u32 dslp;
 
 	if (!swsci)
@@ -299,16 +293,16 @@ static int swsci(struct drm_device *dev, u32 function, u32 parm, u32 *parm_out)
 	swsci->scic = scic;
 
 	/* Ensure SCI event is selected and event trigger is cleared. */
-	pci_read_config_word(dev->pdev, PCI_SWSCI, &pci_swsci);
-	if (!(pci_swsci & PCI_SWSCI_SCISEL) || (pci_swsci & PCI_SWSCI_GSSCIE)) {
-		pci_swsci |= PCI_SWSCI_SCISEL;
-		pci_swsci &= ~PCI_SWSCI_GSSCIE;
-		pci_write_config_word(dev->pdev, PCI_SWSCI, pci_swsci);
+	pci_read_config_word(dev->pdev, SWSCI, &swsci_val);
+	if (!(swsci_val & SWSCI_SCISEL) || (swsci_val & SWSCI_GSSCIE)) {
+		swsci_val |= SWSCI_SCISEL;
+		swsci_val &= ~SWSCI_GSSCIE;
+		pci_write_config_word(dev->pdev, SWSCI, swsci_val);
 	}
 
 	/* Use event trigger to tell bios to check the mail. */
-	pci_swsci |= PCI_SWSCI_GSSCIE;
-	pci_write_config_word(dev->pdev, PCI_SWSCI, pci_swsci);
+	swsci_val |= SWSCI_GSSCIE;
+	pci_write_config_word(dev->pdev, SWSCI, swsci_val);
 
 	/* Poll for the result. */
 #define C (((scic = swsci->scic) & SWSCI_SCIC_INDICATOR) == 0)
@@ -939,7 +933,7 @@ int intel_opregion_setup(struct drm_device *dev)
 	BUILD_BUG_ON(sizeof(struct opregion_asle) != 0x100);
 	BUILD_BUG_ON(sizeof(struct opregion_asle_ext) != 0x400);
 
-	pci_read_config_dword(dev->pdev, PCI_ASLS, &asls);
+	pci_read_config_dword(dev->pdev, ASLS, &asls);
 	DRM_DEBUG_DRIVER("graphic opregion physical addr: 0x%x\n", asls);
 	if (asls == 0) {
 		DRM_DEBUG_DRIVER("ACPI OpRegion not supported!\n");

drivers/gpu/drm/i915/intel_panel.c

@@ -504,7 +504,7 @@ static u32 i9xx_get_backlight(struct intel_connector *connector)
 	if (panel->backlight.combination_mode) {
 		u8 lbpc;
 
-		pci_read_config_byte(dev_priv->dev->pdev, PCI_LBPC, &lbpc);
+		pci_read_config_byte(dev_priv->dev->pdev, LBPC, &lbpc);
 		val *= lbpc;
 	}
 
@@ -592,7 +592,7 @@ static void i9xx_set_backlight(struct intel_connector *connector, u32 level)
 
 		lbpc = level * 0xfe / panel->backlight.max + 1;
 		level /= lbpc;
-		pci_write_config_byte(dev_priv->dev->pdev, PCI_LBPC, lbpc);
+		pci_write_config_byte(dev_priv->dev->pdev, LBPC, lbpc);
 	}
 
 	if (IS_GEN4(dev_priv)) {