radeon_ms: check for NULL fb

diff --git a/shared-core/radeon_ms_crtc.c b/shared-core/radeon_ms_crtc.c
index 63bd4a0..83dd077 100644 (file)
--- a/shared-core/radeon_ms_crtc.c
+++ b/shared-core/radeon_ms_crtc.c
@@ -537,6 +537,10 @@ static void radeon_ms_crtc1_mode_set(struct drm_crtc *crtc,
                  adjusted_mode->hsync_end, adjusted_mode->htotal,
                  adjusted_mode->vdisplay, adjusted_mode->vsync_start,
                  adjusted_mode->vsync_end, adjusted_mode->vtotal, adjusted_mode->type);
+       if (crtc->fb == NULL) {
+               DRM_INFO("[radeon_ms] no FB bound\n");
+               return;
+       }
 
        /* only support RGB555,RGB565,ARGB8888 should satisfy all users */
        switch (crtc->fb->bits_per_pixel) {
@@ -551,7 +555,7 @@ static void radeon_ms_crtc1_mode_set(struct drm_crtc *crtc,
                format = 6;
                break;
        default:
-               DRM_ERROR("Unknown color depth\n");
+               DRM_ERROR("Unknown color depth %d\n", crtc->fb->bits_per_pixel);
                return;
        }
        radeon_pll1_compute(crtc, adjusted_mode);
@@ -665,6 +669,7 @@ static void radeon_ms_crtc_gamma_set(struct drm_crtc *crtc, u16 r,
        if (regno >= 256) {
                return;
        }
+       DRM_INFO("[radeon_ms] gamma[%d]=(%d, %d, %d)\n", regno, r, g, b);
        switch(radeon_ms_crtc->crtc) {
        case 1:
                state->dac_cntl2 &= ~DAC_CNTL2__PALETTE_ACCESS_CNTL;