drm/vc4: Add support for double-clocked modes.

Now that we have infoframes to report the pixel repeat flag, we can
start using it.  Fixes locking the 720x480i and 720x576i modes on my
Dell 2408WFP.  Like the 1920x1080i case, they don't fit properly on
the screen, though.

Signed-off-by: Eric Anholt <eric@anholt.net>

3 files changed, 24 insertions, 11 deletions

diff --git a/drivers/gpu/drm/vc4/vc4_crtc.c b/drivers/gpu/drm/vc4/vc4_crtc.c
index 83cafea03eff..7f08d681a74b 100644
--- a/drivers/gpu/drm/vc4/vc4_crtc.c
+++ b/drivers/gpu/drm/vc4/vc4_crtc.c
@@ -378,6 +378,7 @@ static void vc4_crtc_mode_set_nofb(struct drm_crtc *crtc)
         struct drm_crtc_state *state = crtc->state;
         struct drm_display_mode *mode = &state->adjusted_mode;
         bool interlace = mode->flags & DRM_MODE_FLAG_INTERLACE;
+        u32 pixel_rep = (mode->flags & DRM_MODE_FLAG_DBLCLK) ? 2 : 1;
         u32 format = PV_CONTROL_FORMAT_24;
         bool debug_dump_regs = false;
         int clock_select = vc4_get_clock_select(crtc);
@@ -393,14 +394,17 @@ static void vc4_crtc_mode_set_nofb(struct drm_crtc *crtc)
         CRTC_WRITE(PV_CONTROL, 0);
 
         CRTC_WRITE(PV_HORZA,
-                   VC4_SET_FIELD(mode->htotal - mode->hsync_end,
+                   VC4_SET_FIELD((mode->htotal -
+                                  mode->hsync_end) * pixel_rep,
                                  PV_HORZA_HBP) |
-                   VC4_SET_FIELD(mode->hsync_end - mode->hsync_start,
+                   VC4_SET_FIELD((mode->hsync_end -
+                                  mode->hsync_start) * pixel_rep,
                                  PV_HORZA_HSYNC));
         CRTC_WRITE(PV_HORZB,
-                   VC4_SET_FIELD(mode->hsync_start - mode->hdisplay,
+                   VC4_SET_FIELD((mode->hsync_start -
+                                  mode->hdisplay) * pixel_rep,
                                  PV_HORZB_HFP) |
-                   VC4_SET_FIELD(mode->hdisplay, PV_HORZB_HACTIVE));
+                   VC4_SET_FIELD(mode->hdisplay * pixel_rep, PV_HORZB_HACTIVE));
 
         CRTC_WRITE(PV_VERTA,
                    VC4_SET_FIELD(mode->crtc_vtotal - mode->crtc_vsync_end,
@@ -434,20 +438,21 @@ static void vc4_crtc_mode_set_nofb(struct drm_crtc *crtc)
                 CRTC_WRITE(PV_V_CONTROL,
                            PV_VCONTROL_CONTINUOUS |
                            PV_VCONTROL_INTERLACE |
-                           VC4_SET_FIELD(mode->htotal / 2,
+                           VC4_SET_FIELD(mode->htotal * pixel_rep / 2,
                                          PV_VCONTROL_ODD_DELAY));
                 CRTC_WRITE(PV_VSYNCD_EVEN, 0);
         } else {
                 CRTC_WRITE(PV_V_CONTROL, PV_VCONTROL_CONTINUOUS);
         }
 
-        CRTC_WRITE(PV_HACT_ACT, mode->hdisplay);
+        CRTC_WRITE(PV_HACT_ACT, mode->hdisplay * pixel_rep);
 
 
         CRTC_WRITE(PV_CONTROL,
                    VC4_SET_FIELD(format, PV_CONTROL_FORMAT) |
                    VC4_SET_FIELD(vc4_get_fifo_full_level(format),
                                  PV_CONTROL_FIFO_LEVEL) |
+                   VC4_SET_FIELD(pixel_rep - 1, PV_CONTROL_PIXEL_REP) |
                    PV_CONTROL_CLR_AT_START |
                    PV_CONTROL_TRIGGER_UNDERFLOW |
                    PV_CONTROL_WAIT_HSTART |
diff --git a/drivers/gpu/drm/vc4/vc4_hdmi.c b/drivers/gpu/drm/vc4/vc4_hdmi.c
index d6b54b905bee..c4cb2e26de32 100644
--- a/drivers/gpu/drm/vc4/vc4_hdmi.c
+++ b/drivers/gpu/drm/vc4/vc4_hdmi.c
@@ -402,6 +402,7 @@ static void vc4_hdmi_encoder_mode_set(struct drm_encoder *encoder,
         bool hsync_pos = mode->flags & DRM_MODE_FLAG_PHSYNC;
         bool vsync_pos = mode->flags & DRM_MODE_FLAG_PVSYNC;
         bool interlaced = mode->flags & DRM_MODE_FLAG_INTERLACE;
+        u32 pixel_rep = (mode->flags & DRM_MODE_FLAG_DBLCLK) ? 2 : 1;
         u32 verta = (VC4_SET_FIELD(mode->crtc_vsync_end - mode->crtc_vsync_start,
                                    VC4_HDMI_VERTA_VSP) |
                      VC4_SET_FIELD(mode->crtc_vsync_start - mode->crtc_vdisplay,
@@ -424,7 +425,8 @@ static void vc4_hdmi_encoder_mode_set(struct drm_encoder *encoder,
 
         HD_WRITE(VC4_HD_VID_CTL, 0);
 
-        clk_set_rate(vc4->hdmi->pixel_clock, mode->clock * 1000);
+        clk_set_rate(vc4->hdmi->pixel_clock, mode->clock * 1000 *
+                     ((mode->flags & DRM_MODE_FLAG_DBLCLK) ? 2 : 1));
 
         HDMI_WRITE(VC4_HDMI_SCHEDULER_CONTROL,
                    HDMI_READ(VC4_HDMI_SCHEDULER_CONTROL) |
@@ -434,14 +436,18 @@ static void vc4_hdmi_encoder_mode_set(struct drm_encoder *encoder,
         HDMI_WRITE(VC4_HDMI_HORZA,
                    (vsync_pos ? VC4_HDMI_HORZA_VPOS : 0) |
                    (hsync_pos ? VC4_HDMI_HORZA_HPOS : 0) |
-                   VC4_SET_FIELD(mode->hdisplay, VC4_HDMI_HORZA_HAP));
+                   VC4_SET_FIELD(mode->hdisplay * pixel_rep,
+                                 VC4_HDMI_HORZA_HAP));
 
         HDMI_WRITE(VC4_HDMI_HORZB,
-                   VC4_SET_FIELD(mode->htotal - mode->hsync_end,
+                   VC4_SET_FIELD((mode->htotal -
+                                  mode->hsync_end) * pixel_rep,
                                  VC4_HDMI_HORZB_HBP) |
-                   VC4_SET_FIELD(mode->hsync_end - mode->hsync_start,
+                   VC4_SET_FIELD((mode->hsync_end -
+                                  mode->hsync_start) * pixel_rep,
                                  VC4_HDMI_HORZB_HSP) |
-                   VC4_SET_FIELD(mode->hsync_start - mode->hdisplay,
+                   VC4_SET_FIELD((mode->hsync_start -
+                                  mode->hdisplay) * pixel_rep,
                                  VC4_HDMI_HORZB_HFP));
 
         HDMI_WRITE(VC4_HDMI_VERTA0, verta);
diff --git a/drivers/gpu/drm/vc4/vc4_regs.h b/drivers/gpu/drm/vc4/vc4_regs.h
index 0b868aafa8db..1aa44c2db556 100644
--- a/drivers/gpu/drm/vc4/vc4_regs.h
+++ b/drivers/gpu/drm/vc4/vc4_regs.h
@@ -175,6 +175,8 @@
 # define PV_CONTROL_CLR_AT_START                BIT(14)
 # define PV_CONTROL_TRIGGER_UNDERFLOW           BIT(13)
 # define PV_CONTROL_WAIT_HSTART                 BIT(12)
+# define PV_CONTROL_PIXEL_REP_MASK              VC4_MASK(5, 4)
+# define PV_CONTROL_PIXEL_REP_SHIFT             4
 # define PV_CONTROL_CLK_SELECT_DSI_VEC          0
 # define PV_CONTROL_CLK_SELECT_DPI_SMI_HDMI     1
 # define PV_CONTROL_CLK_SELECT_MASK             VC4_MASK(3, 2)