drm/i915/skl: Implementation of SKL display power well support

This patch implements core logic of SKL display power well.

v2: Addressed Imre's comments
	- Added respective DDIs under power well #1 and #2
	- Simplified repetitive code in power well programming

v3: Implemented Imre's comments
	- Further simplified power well programming
	- Made sure that PW 1 is enabled prior to PW 2

v4: Fix minor conflict with the the cherryview support (Damien)

v5: Add the PLL power domain to the always on power well (Damien)

v6: Disable BIOS power well (Imre)
    Use power well data for comparison (Imre)
    Put the PLL power domain into PW1 as its needed for CDCLK (Satheesh,
    Damien)

v7: Addressed Imre's comments
  - Lowered the time out to 1ms
  - Added parantheses in macro
  - Moved debug message and fixed wait_for interval

v8:
  - Add a WARN() when swiching on an unknown power well (Imre, done by Damien)
  - Whitespace fixes (spaces instead of tabs) (Damien)

v9: (Imre, done by Damien)
  - Merge the register definitions with this patch
  - Merge the MISC IO power well in this patch

v10: (Imre, done by Damien)

  - Define the Misc I/O power domains to be the power well 1 ones as Misc I/O
    needs to be enabled with PW1
  - Added Transcoder A and VGA domains to PW 2
  - Remove the MISC_IO power domains as well in the the always on
    domains definition
  - Move Misc I/O power well at the top of the power well list so it's turned
    on right after PW1.

Reviewed-by: Imre Deak <imre.deak@intel.com>
Signed-off-by: Satheeshakrishna M <satheeshakrishna.m@intel.com> (v3,v6,v7)
Signed-off-by: Damien Lespiau <damien.lespiau@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

1 files changed, 20 insertions, 0 deletions

diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 33b3d0a24071..cd3430f931ed 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -586,6 +586,19 @@ enum punit_power_well {
         PUNIT_POWER_WELL_NUM,
 };
 
+enum skl_disp_power_wells {
+        SKL_DISP_PW_MISC_IO,
+        SKL_DISP_PW_DDI_A_E,
+        SKL_DISP_PW_DDI_B,
+        SKL_DISP_PW_DDI_C,
+        SKL_DISP_PW_DDI_D,
+        SKL_DISP_PW_1 = 14,
+        SKL_DISP_PW_2,
+};
+
+#define SKL_POWER_WELL_STATE(pw) (1 << ((pw) * 2))
+#define SKL_POWER_WELL_REQ(pw) (1 << (((pw) * 2) + 1))
+
 #define PUNIT_REG_PWRGT_CTRL                    0x60
 #define PUNIT_REG_PWRGT_STATUS                  0x61
 #define   PUNIT_PWRGT_MASK(power_well)          (3 << ((power_well) * 2))
@@ -6351,6 +6364,13 @@ enum punit_power_well {
 #define   HSW_PWR_WELL_FORCE_ON                 (1<<19)
 #define HSW_PWR_WELL_CTL6                       0x45414
 
+/* SKL Fuse Status */
+#define SKL_FUSE_STATUS                         0x42000
+#define  SKL_FUSE_DOWNLOAD_STATUS              (1<<31)
+#define  SKL_FUSE_PG0_DIST_STATUS              (1<<27)
+#define  SKL_FUSE_PG1_DIST_STATUS              (1<<26)
+#define  SKL_FUSE_PG2_DIST_STATUS              (1<<25)
+
 /* Per-pipe DDI Function Control */
 #define TRANS_DDI_FUNC_CTL_A            0x60400
 #define TRANS_DDI_FUNC_CTL_B            0x61400