[Intel-gfx] [PATCH] drm/i915: Correct the base value while updating LP_OUTPUT_HOLD in MIPI_PORT_CTRL

[shuang.he at intel.com]

Tested-By: PRC QA PRTS (Patch Regression Test System Contact: shuang.he at intel.com)
Task id: 5718
-------------------------------------Summary-------------------------------------
Platform          Delta          drm-intel-nightly          Series Applied
PNV                 -8              282/283              274/283
ILK              +1                 316/319              317/319
SNB                                  322/346              322/346
IVB                 -1              382/384              381/384
BYT                                  296/296              296/296
HSW                                  425/428              425/428
BDW                                  318/333              318/333
-------------------------------------Detailed-------------------------------------
Platform  Test                                drm-intel-nightly          Series Applied
*PNV  igt_gem_fence_thrash_bo-write-verify-y      PASS(2, M23M7)      FAIL(1, M7)
 PNV  igt_gem_userptr_blits_coherency-sync      CRASH(2, M7)PASS(1, M23)      CRASH(1, M7)
 PNV  igt_gem_userptr_blits_coherency-unsync      CRASH(2, M7)PASS(1, M23)      CRASH(1, M7)
*PNV  igt_gem_userptr_blits_forked-sync-interruptible      PASS(2, M23M7)      DMESG_WARN(1, M7)
*PNV  igt_gem_userptr_blits_forked-sync-multifd-interruptible      PASS(2, M23M7)      NO_RESULT(1, M7)
 PNV  igt_gen3_render_linear_blits      FAIL(3, M7)CRASH(1, M23)PASS(4, M25M23)      FAIL(1, M7)
 PNV  igt_gen3_render_mixed_blits      FAIL(3, M7)PASS(1, M23)      FAIL(1, M7)
 PNV  igt_gen3_render_tiledx_blits      FAIL(2, M7)PASS(1, M23)      FAIL(1, M7)
 PNV  igt_gem_tiled_pread_pwrite      FAIL(2, M7)PASS(1, M23)      FAIL(1, M7)
*ILK  igt_drv_suspend_forcewake      DMESG_WARN(5, M26M37)      PASS(1, M26)
 IVB  igt_gem_pwrite_pread_snooped-pwrite-blt-cpu_mmap-performance      DMESG_WARN(2, M34)PASS(5, M21M34)      DMESG_WARN(1, M21)
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