drm/radeon: gcc fixes for ci 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/ci_dpm.c b/drivers/gpu/drm/radeon/ci_dpm.c
index 7a6068968b70..dd2a07c44c3a 100644
--- a/drivers/gpu/drm/radeon/ci_dpm.c
+++ b/drivers/gpu/drm/radeon/ci_dpm.c
@@ -4931,6 +4931,7 @@ static int ci_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 *)
@@ -4947,14 +4948,16 @@ static int ci_parse_power_table(struct radeon_device *rdev)
                                               non_clock_info,
                                               non_clock_info_array->ucEntrySize);
                 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 >= CISLANDS_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));
                         ci_parse_pplib_clock_info(rdev,
                                                   &rdev->pm.dpm.ps[i], k,
                                                   clock_info);