drm/radeon: gcc fixes for kb/kv dpm

Newer versions of gcc seem to wander off into the
weeds when dealing with variable sizes arrays in
structs.  Rather than indexing the arrays, use
pointer arithmetic.

See bugs:
https://bugs.freedesktop.org/show_bug.cgi?id=66932
https://bugs.freedesktop.org/show_bug.cgi?id=66972
https://bugs.freedesktop.org/show_bug.cgi?id=66945

Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

1 files changed, 5 insertions, 2 deletions

diff --git a/drivers/gpu/drm/radeon/kv_dpm.c b/drivers/gpu/drm/radeon/kv_dpm.c
index 15a6f67813d7..ecd60809db4e 100644
--- a/drivers/gpu/drm/radeon/kv_dpm.c
+++ b/drivers/gpu/drm/radeon/kv_dpm.c
@@ -2466,6 +2466,7 @@ static int kv_parse_power_table(struct radeon_device *rdev)
         rdev->pm.dpm.backbias_response_time = le16_to_cpu(power_info->pplib.usBackbiasTime);
         rdev->pm.dpm.voltage_response_time = le16_to_cpu(power_info->pplib.usVoltageTime);
         for (i = 0; i < state_array->ucNumEntries; i++) {
+                u8 *idx;
                 power_state = (union pplib_power_state *)power_state_offset;
                 non_clock_array_index = power_state->v2.nonClockInfoIndex;
                 non_clock_info = (struct _ATOM_PPLIB_NONCLOCK_INFO *)
@@ -2479,14 +2480,16 @@ static int kv_parse_power_table(struct radeon_device *rdev)
                 }
                 rdev->pm.dpm.ps[i].ps_priv = ps;
                 k = 0;
+                idx = (u8 *)&power_state->v2.clockInfoIndex[0];
                 for (j = 0; j < power_state->v2.ucNumDPMLevels; j++) {
-                        clock_array_index = power_state->v2.clockInfoIndex[j];
+                        clock_array_index = idx[j];
                         if (clock_array_index >= clock_info_array->ucNumEntries)
                                 continue;
                         if (k >= SUMO_MAX_HARDWARE_POWERLEVELS)
                                 break;
                         clock_info = (union pplib_clock_info *)
-                                &clock_info_array->clockInfo[clock_array_index * clock_info_array->ucEntrySize];
+                                ((u8 *)&clock_info_array->clockInfo[0] +
+                                 (clock_array_index * clock_info_array->ucEntrySize));
                         kv_parse_pplib_clock_info(rdev,
                                                   &rdev->pm.dpm.ps[i], k,
                                                   clock_info);