Disable MIP mapping on PowerVR 54x. This GPU spews a lot of errors when using GenerateMipMaps.

src/gpu/gl/GrGLCaps.cpp

 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 
 #include "GrGLCaps.h"
 
@@ skipping 340 matching lines @@
         // ES3 has no limitations.
         fNPOTTextureTileSupport = ctxInfo.version() >= GR_GL_VER(3,0) ||
                                   ctxInfo.hasExtension("GL_OES_texture_npot");
         // ES2 supports MIP mapping for POT textures but our caps don't allow for limited MIP
         // support. The OES extension or ES 3.0 allow for MIPS on NPOT textures. So, apparently,
         // does the undocumented GL_IMG_texture_npot extension. This extension does not seem to
         // to alllow arbitrary wrap modes, however.
         fMipMapSupport = fNPOTTextureTileSupport || ctxInfo.hasExtension("GL_IMG_texture_npot");
     }
 
+    // Using MIPs on this GPU seems to be a source of trouble.
+    if (kPowerVR54x_GrGLRenderer == ctxInfo.renderer()) {
+        fMipMapSupport = false;
+    }
+
     GR_GL_GetIntegerv(gli, GR_GL_MAX_TEXTURE_SIZE, &fMaxTextureSize);
     GR_GL_GetIntegerv(gli, GR_GL_MAX_RENDERBUFFER_SIZE, &fMaxRenderTargetSize);
     // Our render targets are always created with textures as the color
     // attachment, hence this min:
     fMaxRenderTargetSize = SkTMin(fMaxTextureSize, fMaxRenderTargetSize);
 
     // This GPU seems to have problems when tiling small textures
     if (kPowerVR54x_GrGLRenderer == ctxInfo.renderer()) {
         fMinTextureSize = 16;
     }
@@ skipping 895 matching lines @@
         for (int p = 0; p < kGrSLPrecisionCount; ++p) {
             glslCaps->fFloatPrecisions[kGeometry_GrShaderType][p] = 
                                                glslCaps->fFloatPrecisions[kVertex_GrShaderType][p];
         }
     }
 }