1 files changed, 39 insertions, 0 deletions

diff --git a/drivers/gpu/drm/radeon/radeon_atombios.c b/drivers/gpu/drm/radeon/radeon_atombios.c
index 87ead090c7d5..4d37b2d1ba74 100644
--- a/drivers/gpu/drm/radeon/radeon_atombios.c
+++ b/drivers/gpu/drm/radeon/radeon_atombios.c
@@ -1321,6 +1321,43 @@ bool radeon_atombios_get_ppll_ss_info(struct radeon_device *rdev,
         return false;
 }
 
+static void radeon_atombios_get_igp_ss_overrides(struct radeon_device *rdev,
+                                                 struct radeon_atom_ss *ss,
+                                                 int id)
+{
+        struct radeon_mode_info *mode_info = &rdev->mode_info;
+        int index = GetIndexIntoMasterTable(DATA, IntegratedSystemInfo);
+        u16 data_offset, size;
+        struct _ATOM_INTEGRATED_SYSTEM_INFO_V6 *igp_info;
+        u8 frev, crev;
+        u16 percentage = 0, rate = 0;
+
+        /* get any igp specific overrides */
+        if (atom_parse_data_header(mode_info->atom_context, index, &size,
+                                   &frev, &crev, &data_offset)) {
+                igp_info = (struct _ATOM_INTEGRATED_SYSTEM_INFO_V6 *)
+                        (mode_info->atom_context->bios + data_offset);
+                switch (id) {
+                case ASIC_INTERNAL_SS_ON_TMDS:
+                        percentage = le16_to_cpu(igp_info->usDVISSPercentage);
+                        rate = le16_to_cpu(igp_info->usDVISSpreadRateIn10Hz);
+                        break;
+                case ASIC_INTERNAL_SS_ON_HDMI:
+                        percentage = le16_to_cpu(igp_info->usHDMISSPercentage);
+                        rate = le16_to_cpu(igp_info->usHDMISSpreadRateIn10Hz);
+                        break;
+                case ASIC_INTERNAL_SS_ON_LVDS:
+                        percentage = le16_to_cpu(igp_info->usLvdsSSPercentage);
+                        rate = le16_to_cpu(igp_info->usLvdsSSpreadRateIn10Hz);
+                        break;
+                }
+                if (percentage)
+                        ss->percentage = percentage;
+                if (rate)
+                        ss->rate = rate;
+        }
+}
+
 union asic_ss_info {
         struct _ATOM_ASIC_INTERNAL_SS_INFO info;
         struct _ATOM_ASIC_INTERNAL_SS_INFO_V2 info_2;
@@ -1385,6 +1422,8 @@ bool radeon_atombios_get_asic_ss_info(struct radeon_device *rdev,
                                                 le16_to_cpu(ss_info->info_3.asSpreadSpectrum[i].usSpreadSpectrumPercentage);
                                         ss->type = ss_info->info_3.asSpreadSpectrum[i].ucSpreadSpectrumMode;
                                         ss->rate = le16_to_cpu(ss_info->info_3.asSpreadSpectrum[i].usSpreadRateIn10Hz);
+                                        if (rdev->flags & RADEON_IS_IGP)
+                                                radeon_atombios_get_igp_ss_overrides(rdev, ss, id);
                                         return true;
                                 }
                         }