From ebbe1cb936dfc96d809ccf4d64a9755f8ba0c0ff Mon Sep 17 00:00:00 2001 From: Alex Deucher Date: Fri, 16 Oct 2009 11:15:25 -0400 Subject: drm/radeon/kms/atom: add support for spread spectrum (v2) 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 Signed-off-by: Dave Airlie --- drivers/gpu/drm/radeon/radeon_atombios.c | 42 ++++++++++++++++++++++++++++++++ 1 file changed, 42 insertions(+) (limited to 'drivers/gpu/drm/radeon/radeon_atombios.c') diff --git a/drivers/gpu/drm/radeon/radeon_atombios.c b/drivers/gpu/drm/radeon/radeon_atombios.c index cec67917179..18729259c2f 100644 --- a/drivers/gpu/drm/radeon/radeon_atombios.c +++ b/drivers/gpu/drm/radeon/radeon_atombios.c @@ -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; -- cgit v1.2.3