drm/i915: rewrite the LCPLL code
Right now, we're trying to enable LCPLL at every mode set, but we're
never disabling it. Also, we really don't want to be disabling LCPLL
since it requires a very complex disable/enable sequence. This
register should really be set by the BIOS and we shouldn't be touching
it. Still, let's try to check its value and print some errors in case
we find something wrong. We're also adding intel_ddi_get_cdclk_freq
which will be used later in other places.
Signed-off-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Reviewed-by: Damien Lespiau <damien.lespiau@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 f3a06b4..5107cee 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -3456,6 +3456,9 @@
#define GEN7_SQ_CHICKEN_MBCUNIT_CONFIG 0x9030
#define GEN7_SQ_CHICKEN_MBCUNIT_SQINTMOB (1<<11)
+#define HSW_FUSE_STRAP 0x42014
+#define HSW_CDCLK_LIMIT (1 << 24)
+
/* PCH */
/* south display engine interrupt: IBX */
@@ -4531,8 +4534,11 @@
#define LCPLL_CTL 0x130040
#define LCPLL_PLL_DISABLE (1<<31)
#define LCPLL_PLL_LOCK (1<<30)
+#define LCPLL_CLK_FREQ_MASK (3<<26)
+#define LCPLL_CLK_FREQ_450 (0<<26)
#define LCPLL_CD_CLOCK_DISABLE (1<<25)
#define LCPLL_CD2X_CLOCK_DISABLE (1<<23)
+#define LCPLL_CD_SOURCE_FCLK (1<<21)
/* Pipe WM_LINETIME - watermark line time */
#define PIPE_WM_LINETIME_A 0x45270