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drm/radeon/kms/atom: add support for spread spectrum (v2)

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Spread spectrum is a periodic disturbance added
to the feedback divider to change the pixel clock
periodically to reduce interference.

Only enabled on LVDS.

v2: add support for r4xx and fix DCE 3

Signed-off-by: Alex Deucher <alexdeucher@gmail.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
This commit is contained in:
Alex Deucher
2009-10-16 11:15:25 -04:00
committed by Dave Airlie
parent c290dadf4c
commit ebbe1cb936
4 changed files with 111 additions and 12 deletions
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42
drivers/gpu/drm/radeon/radeon_atombios.c
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@@ -771,6 +771,46 @@ bool radeon_atombios_get_tmds_info(struct radeon_encoder *encoder,
return false;
}
static struct radeon_atom_ss *radeon_atombios_get_ss_info(struct
radeon_encoder
*encoder,
int id)
{
struct drm_device *dev = encoder->base.dev;
struct radeon_device *rdev = dev->dev_private;
struct radeon_mode_info *mode_info = &rdev->mode_info;
int index = GetIndexIntoMasterTable(DATA, PPLL_SS_Info);
uint16_t data_offset;
struct _ATOM_SPREAD_SPECTRUM_INFO *ss_info;
uint8_t frev, crev;
struct radeon_atom_ss *ss = NULL;
if (id > ATOM_MAX_SS_ENTRY)
return NULL;
atom_parse_data_header(mode_info->atom_context, index, NULL, &frev,
&crev, &data_offset);
ss_info =
(struct _ATOM_SPREAD_SPECTRUM_INFO *)(mode_info->atom_context->bios + data_offset);
if (ss_info) {
ss =
kzalloc(sizeof(struct radeon_atom_ss), GFP_KERNEL);
if (!ss)
return NULL;
ss->percentage = le16_to_cpu(ss_info->asSS_Info[id].usSpreadSpectrumPercentage);
ss->type = ss_info->asSS_Info[id].ucSpreadSpectrumType;
ss->step = ss_info->asSS_Info[id].ucSS_Step;
ss->delay = ss_info->asSS_Info[id].ucSS_Delay;
ss->range = ss_info->asSS_Info[id].ucSS_Range;
ss->refdiv = ss_info->asSS_Info[id].ucRecommendedRef_Div;
}
return ss;
}
union lvds_info {
struct _ATOM_LVDS_INFO info;
struct _ATOM_LVDS_INFO_V12 info_12;
@@ -826,6 +866,8 @@ struct radeon_encoder_atom_dig *radeon_atombios_get_lvds_info(struct
/* set crtc values */
drm_mode_set_crtcinfo(&lvds->native_mode, CRTC_INTERLACE_HALVE_V);
lvds->ss = radeon_atombios_get_ss_info(encoder, lvds_info->info.ucSS_Id);
encoder->native_mode = lvds->native_mode;
}
return lvds;