gpu: nvgpu: adapt pwrpolicy code to vbios changes

VBIOS might change size of the power policy table and add new fields.
So driver should validate a minimum size,  not absolute size.
Also driver should use header size from data read from vbios
to parse the table further.

bug 200287822

Change-Id: Ica60de444c3f81cbf61af8684ce4e32ae288188d
Signed-off-by: Vijayakumar <vsubbu@nvidia.com>
Reviewed-on: http://git-master/r/1322242
Reviewed-by: svccoveritychecker <svccoveritychecker@nvidia.com>
Reviewed-by: Thomas Fleury <tfleury@nvidia.com>
GVS: Gerrit_Virtual_Submit
Reviewed-by: Terje Bergstrom <tbergstrom@nvidia.com>
Tested-by: Terje Bergstrom <tbergstrom@nvidia.com>

1 files changed, 2 insertions, 2 deletions

diff --git a/drivers/gpu/nvgpu/pmgr/pwrpolicy.c b/drivers/gpu/nvgpu/pmgr/pwrpolicy.c
index 4c007337..c2053469 100644
--- a/drivers/gpu/nvgpu/pmgr/pwrpolicy.c
+++ b/drivers/gpu/nvgpu/pmgr/pwrpolicy.c
@@ -543,7 +543,7 @@ static u32 devinit_get_pwr_policy_table(struct gk20a *g,
                 goto done;
         }
 
-        if (packed_hdr->table_entry_size !=
+        if (packed_hdr->table_entry_size <
                         VBIOS_POWER_POLICY_3X_ENTRY_SIZE_2E) {
                 status = -EINVAL;
                 goto done;
@@ -552,7 +552,7 @@ static u32 devinit_get_pwr_policy_table(struct gk20a *g,
         /* unpack power policy table header */
         devinit_unpack_pwr_policy_header(&hdr, packed_hdr);
 
-        ptr += VBIOS_POWER_POLICY_3X_HEADER_SIZE_25;
+        ptr += (u32)hdr.header_size;
 
         for (index = 0; index < hdr.num_table_entries;
                 index++, ptr += (u32)hdr.table_entry_size) {