drm/i915: Program GMBUS Frequency based on the CDCLK for VLV.
CDCLK is used to generate the gmbus clock. This is normally done by
BIOS. Program the value if the BIOS-less system doesn't do it.
v2: Move this to intel_i2c_reset to allow reprogram the gmbus frequency
during resume. (Daniel)
v3: Change GMBUS_FREQ to GMBUSFREQ_VLV, and use VLV_DISPLAY_BASE.
(Ville).
Remove cdclk_ratio[] table, and calculate the cdclk ratio instead.
(Ville).
Change the shift then mask for reg read, to mask first, then shift.
(Ville).
Remove the gmbus frequency calculation = cdclk/1.01. Based on BIOS
programming, gmbus frequency = cdclk frequency. (Ville)
Add get_disp_clk_div, which can use to get cdclk/czclk divide.
v4: Fix the mmio_offset base for CZCLK_CDCLK_FREQ_RATIO, gmbus_freq
calculation, and duplicate check for gmbus_freq. (Ville)
In VLV, the spec is wrong about 4Mhz reference frequency for GMBUS. It
should be 1Mhz.
Signed-off-by: Chon Ming Lee <chon.ming.lee@intel.com>
[danvet: Add the comment Ville suggested. Also appease checkpatch a
bit.]
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 00fda45..33bb475 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -382,6 +382,8 @@
#define FB_FMAX_VMIN_FREQ_LO_MASK 0xf8000000
/* vlv2 north clock has */
+#define CCK_FUSE_REG 0x8
+#define CCK_FUSE_HPLL_FREQ_MASK 0x3
#define CCK_REG_DSI_PLL_FUSE 0x44
#define CCK_REG_DSI_PLL_CONTROL 0x48
#define DSI_PLL_VCO_EN (1 << 31)
@@ -1429,6 +1431,12 @@
#define MI_ARB_VLV (VLV_DISPLAY_BASE + 0x6504)
+#define CZCLK_CDCLK_FREQ_RATIO (VLV_DISPLAY_BASE + 0x6508)
+#define CDCLK_FREQ_SHIFT 4
+#define CDCLK_FREQ_MASK (0x1f << CDCLK_FREQ_SHIFT)
+#define CZCLK_FREQ_MASK 0xf
+#define GMBUSFREQ_VLV (VLV_DISPLAY_BASE + 0x6510)
+
/*
* Palette regs
*/
