drm/tilcdc: support pixel widths greater than 1024

TI LCD controller version 2 has an extended eleventh
bit that enables horizontal resolutions greater than
1024 pixels to be specified (upto 2048).  This patch
adds support for setting this bit on LCDC V2.

Signed-off-by: Darren Etheridge <detheridge@ti.com>
Acked-by: Rob Clark <robdclark@gmail.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

diff --git a/drivers/gpu/drm/tilcdc/tilcdc_crtc.c b/drivers/gpu/drm/tilcdc/tilcdc_crtc.c
index 4de3fb4..5b68fe5 100644 (file)
--- a/drivers/gpu/drm/tilcdc/tilcdc_crtc.c
+++ b/drivers/gpu/drm/tilcdc/tilcdc_crtc.c
@@ -310,6 +310,21 @@ static int tilcdc_crtc_mode_set(struct drm_crtc *crtc,
                ((vsw & 0x3f) << 10);
        tilcdc_write(dev, LCDC_RASTER_TIMING_1_REG, reg);
 
+       /*
+        * be sure to set Bit 10 for the V2 LCDC controller,
+        * otherwise limited to 1024 pixels width, stopping
+        * 1920x1080 being suppoted.
+        */
+       if (priv->rev == 2) {
+               if ((mode->vdisplay - 1) & 0x400) {
+                       tilcdc_set(dev, LCDC_RASTER_TIMING_2_REG,
+                               LCDC_LPP_B10);
+               } else {
+                       tilcdc_clear(dev, LCDC_RASTER_TIMING_2_REG,
+                               LCDC_LPP_B10);
+               }
+       }
+
        /* Configure display type: */
        reg = tilcdc_read(dev, LCDC_RASTER_CTRL_REG) &
                ~(LCDC_TFT_MODE | LCDC_MONO_8BIT_MODE | LCDC_MONOCHROME_MODE |

diff --git a/drivers/gpu/drm/tilcdc/tilcdc_regs.h b/drivers/gpu/drm/tilcdc/tilcdc_regs.h
index 17fd1b4..1bf5e25 100644 (file)
--- a/drivers/gpu/drm/tilcdc/tilcdc_regs.h
+++ b/drivers/gpu/drm/tilcdc/tilcdc_regs.h
@@ -80,6 +80,7 @@
 #define LCDC_INVERT_PIXEL_CLOCK                  BIT(22)
 #define LCDC_INVERT_HSYNC                        BIT(21)
 #define LCDC_INVERT_VSYNC                        BIT(20)
+#define LCDC_LPP_B10                             BIT(26)
 
 /* LCDC Block */
 #define LCDC_PID_REG                             0x0