When hooking up to an HDMI analyzer noticed some timings were off by one. Referring to the hardware technical reference manual for the lcd controller some of the timing registers use 0 to represent 1. This patch addresses that issue.
Signed-off-by: Darren Etheridge detheridge@ti.com --- drivers/gpu/drm/tilcdc/tilcdc_crtc.c | 19 ++++++++++++------- 1 files changed, 12 insertions(+), 7 deletions(-)
diff --git a/drivers/gpu/drm/tilcdc/tilcdc_crtc.c b/drivers/gpu/drm/tilcdc/tilcdc_crtc.c index 05f2b14..4455a41 100644 --- a/drivers/gpu/drm/tilcdc/tilcdc_crtc.c +++ b/drivers/gpu/drm/tilcdc/tilcdc_crtc.c @@ -289,17 +289,22 @@ static int tilcdc_crtc_mode_set(struct drm_crtc *crtc, reg = tilcdc_read(dev, LCDC_RASTER_TIMING_2_REG) & ~0x000fff00; reg |= LCDC_AC_BIAS_FREQUENCY(info->ac_bias) | LCDC_AC_BIAS_TRANSITIONS_PER_INT(info->ac_bias_intrpt); + + /* + * subtract one from hfp, hbp, hsw because the hardware uses + * a value of 0 as 1 + */ if (priv->rev == 2) { - reg |= (hfp & 0x300) >> 8; - reg |= (hbp & 0x300) >> 4; - reg |= (hsw & 0x3c0) << 21; + reg |= ((hfp-1) & 0x300) >> 8; + reg |= ((hbp-1) & 0x300) >> 4; + reg |= ((hsw-1) & 0x3c0) << 21; } tilcdc_write(dev, LCDC_RASTER_TIMING_2_REG, reg);
reg = (((mode->hdisplay >> 4) - 1) << 4) | - ((hbp & 0xff) << 24) | - ((hfp & 0xff) << 16) | - ((hsw & 0x3f) << 10); + (((hbp-1) & 0xff) << 24) | + (((hfp-1) & 0xff) << 16) | + (((hsw-1) & 0x3f) << 10); if (priv->rev == 2) reg |= (((mode->hdisplay >> 4) - 1) & 0x40) >> 3; tilcdc_write(dev, LCDC_RASTER_TIMING_0_REG, reg); @@ -307,7 +312,7 @@ static int tilcdc_crtc_mode_set(struct drm_crtc *crtc, reg = ((mode->vdisplay - 1) & 0x3ff) | ((vbp & 0xff) << 24) | ((vfp & 0xff) << 16) | - ((vsw & 0x3f) << 10); + (((vsw-1) & 0x3f) << 10); tilcdc_write(dev, LCDC_RASTER_TIMING_1_REG, reg);
/*