drm/i915: Enable pixel replicated modes on BDW and HSW.

Haswell and later silicon has added a new pixel replication register
to the pipe timings for each transcoder. Now in addition to the
DPLL_A_MD register for the pixel clock double, we also need to write
to the TRANS_MULT_n (0x6002c) register to double the pixel data. Writing
to the DPLL only double the pixel clock.

ver2: Macro name change from MULTIPLY to PIPE_MULTI. (Daniel)
ver3: Do not set pixel multiplier if transcoder is eDP (Ville)
ver4: Macro name change to PIPE_MULT and default else pixel_multiplier

Cc: Ville =?iso-8859-1?Q?Syrj=E4l=E4?= <ville.syrjala@linux.intel.com>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: Jani Nikula <jani.nikula@intel.com>

Signed-off-by: Clint Taylor <clinton.a.taylor@intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
[danvet: Appease checkpatch and move one hunk back into the right
place that git am misplace!?]
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

2 files changed, 14 insertions, 1 deletions

diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index e887d4c13ca1..c01e5f31430e 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -2443,6 +2443,7 @@ enum punit_power_well {
 #define _PIPEASRC       0x6001c
 #define _BCLRPAT_A      0x60020
 #define _VSYNCSHIFT_A   0x60028
+#define _PIPE_MULT_A    0x6002c
 
 /* Pipe B timing regs */
 #define _HTOTAL_B       0x61000
@@ -2454,6 +2455,7 @@ enum punit_power_well {
 #define _PIPEBSRC       0x6101c
 #define _BCLRPAT_B      0x61020
 #define _VSYNCSHIFT_B   0x61028
+#define _PIPE_MULT_B    0x6102c
 
 #define TRANSCODER_A_OFFSET 0x60000
 #define TRANSCODER_B_OFFSET 0x61000
@@ -2474,6 +2476,7 @@ enum punit_power_well {
 #define BCLRPAT(trans) _TRANSCODER2(trans, _BCLRPAT_A)
 #define VSYNCSHIFT(trans) _TRANSCODER2(trans, _VSYNCSHIFT_A)
 #define PIPESRC(trans) _TRANSCODER2(trans, _PIPEASRC)
+#define PIPE_MULT(trans) _TRANSCODER2(trans, _PIPE_MULT_A)
 
 /* HSW+ eDP PSR registers */
 #define EDP_PSR_BASE(dev)                       (IS_HASWELL(dev) ? 0x64800 : 0x6f800)
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 2d4258038ef2..507370513f3d 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -4222,6 +4222,11 @@ static void haswell_crtc_enable(struct drm_crtc *crtc)
 
         intel_set_pipe_timings(intel_crtc);
 
+        if (intel_crtc->config.cpu_transcoder != TRANSCODER_EDP) {
+                I915_WRITE(PIPE_MULT(intel_crtc->config.cpu_transcoder),
+                           intel_crtc->config.pixel_multiplier - 1);
+        }
+
         if (intel_crtc->config.has_pch_encoder) {
                 intel_cpu_transcoder_set_m_n(intel_crtc,
                                      &intel_crtc->config.fdi_m_n, NULL);
@@ -7890,7 +7895,12 @@ static bool haswell_get_pipe_config(struct intel_crtc *crtc,
                 pipe_config->ips_enabled = hsw_crtc_supports_ips(crtc) &&
                         (I915_READ(IPS_CTL) & IPS_ENABLE);
 
-        pipe_config->pixel_multiplier = 1;
+        if (pipe_config->cpu_transcoder != TRANSCODER_EDP) {
+                pipe_config->pixel_multiplier =
+                        I915_READ(PIPE_MULT(pipe_config->cpu_transcoder)) + 1;
+        } else {
+                pipe_config->pixel_multiplier = 1;
+        }
 
         return true;
 }