[Intel-gfx] [PATCH] drm/i915: Read CHV_PLL_DW8 from the correct offset

[shuang.he at intel.com]

Tested-By: PRC QA PRTS (Patch Regression Test System Contact: shuang.he at intel.com)
Task id: 5936
-------------------------------------Summary-------------------------------------
Platform          Delta          drm-intel-nightly          Series Applied
PNV                 -15              281/281              266/281
ILK                 -1              308/308              307/308
SNB                 -1              284/284              283/284
IVB                                  375/375              375/375
BYT                                  294/294              294/294
HSW                 -1              384/384              383/384
BDW                                  315/315              315/315
-------------------------------------Detailed-------------------------------------
Platform  Test                                drm-intel-nightly          Series Applied
*PNV  igt_gem_fence_thrash_bo-write-verify-none      PASS(3)      FAIL(1)
*PNV  igt_gem_fence_thrash_bo-write-verify-x      PASS(3)      FAIL(1)
*PNV  igt_gem_fence_thrash_bo-write-verify-y      PASS(3)      FAIL(1)
 PNV  igt_gem_userptr_blits_coherency-sync      CRASH(5)PASS(2)      CRASH(1)
 PNV  igt_gen3_render_linear_blits      FAIL(3)PASS(1)      FAIL(1)
 PNV  igt_gen3_render_mixed_blits      FAIL(2)PASS(2)      FAIL(1)
 PNV  igt_gen3_render_tiledx_blits      FAIL(4)PASS(1)      FAIL(1)
 PNV  igt_gem_fence_thrash_bo-write-verify-threaded-none      CRASH(2)PASS(4)      CRASH(1)
*PNV  igt_gem_partial_pwrite_pread_reads      PASS(2)      NRUN(1)
*PNV  igt_gem_partial_pwrite_pread_reads-display      PASS(2)      NRUN(1)
*PNV  igt_gem_pwrite_pread_display-pwrite-blt-gtt_mmap-performance      PASS(2)      NRUN(1)
*PNV  igt_gem_ringfill_blitter      PASS(2)      NRUN(1)
*PNV  igt_gem_ringfill_blitter-interruptible      PASS(2)      NRUN(1)
*PNV  igt_gem_tiled_pread_pwrite      FAIL(1)PASS(2)      NRUN(1)
*PNV  igt_gem_userptr_blits_forked-sync-mempressure-interruptible      PASS(2)      NRUN(1)
*ILK  igt_gem_unfence_active_buffers      PASS(3)      DMESG_WARN(1)PASS(1)
*SNB  igt_gem_flink_bad-open      PASS(2)      DMESG_WARN(1)PASS(1)
*HSW  igt_pm_rpm_reg-read-ioctl      PASS(2)      DMESG_FAIL(1)PASS(1)
Note: You need to pay more attention to line start with '*'