drm/i915: don't recheck for invalid pipe bpp

As noticed by Daniel Vetter, intel_pipe_choose_bpp_dither should
already check for invalid bpp values and set a valid value, so remove
the recheck inside ironlake_crtc_mode_set and also replace a "default"
switch case inside ironlake_set_pipeconf with a BUG().

Signed-off-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Reviewed-by: Rodrigo Vivi <rodrigo.vivi@gmail.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 6f5aafa..1458563 100644 (file)
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -4626,8 +4626,8 @@ static void ironlake_set_pipeconf(struct drm_crtc *crtc,
                val |= PIPE_12BPC;
                break;
        default:
-               val |= PIPE_8BPC;
-               break;
+               /* Case prevented by intel_choose_pipe_bpp_dither. */
+               BUG();
        }
 
        val &= ~(PIPECONF_DITHER_EN | PIPECONF_DITHER_TYPE_MASK);
@@ -4728,7 +4728,6 @@ static int ironlake_crtc_mode_set(struct drm_crtc *crtc,
        struct fdi_m_n m_n = {0};
        u32 temp;
        int target_clock, pixel_multiplier, lane, link_bw, factor;
-       unsigned int pipe_bpp;
        bool dither;
        bool is_cpu_edp = false, is_pch_edp = false;
 
@@ -4802,18 +4801,10 @@ static int ironlake_crtc_mode_set(struct drm_crtc *crtc,
                target_clock = adjusted_mode->clock;
 
        /* determine panel color depth */
-       dither = intel_choose_pipe_bpp_dither(crtc, fb, &pipe_bpp, mode);
+       dither = intel_choose_pipe_bpp_dither(crtc, fb, &intel_crtc->bpp, mode);
        if (is_lvds && dev_priv->lvds_dither)
                dither = true;
 
-       if (pipe_bpp != 18 && pipe_bpp != 24 && pipe_bpp != 30 &&
-           pipe_bpp != 36) {
-               WARN(1, "intel_choose_pipe_bpp returned invalid value %d\n",
-                    pipe_bpp);
-               pipe_bpp = 24;
-       }
-       intel_crtc->bpp = pipe_bpp;
-
        if (!lane) {
                /*
                 * Account for spread spectrum to avoid