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

Browse source 
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
Show stats Download patch file Download diff file Expand all files Collapse all files

2
drivers/gpu/drm/radeon/atombios.h
View file

@ -2314,7 +2314,7 @@ typedef struct _ATOM_SPREAD_SPECTRUM_ASSIGNMENT {
UCHAR ucSS_Step;
UCHAR ucSS_Delay;
UCHAR ucSS_Id;
UCHAR ucRecommandedRef_Div;
UCHAR ucRecommendedRef_Div;
UCHAR ucSS_Range; /* it was reserved for V11 */
} ATOM_SPREAD_SPECTRUM_ASSIGNMENT;

68
drivers/gpu/drm/radeon/atombios_crtc.c
View file

@ -351,6 +351,61 @@ static void atombios_crtc_set_timing(struct drm_crtc *crtc,
atom_execute_table(rdev->mode_info.atom_context, index, (uint32_t *)&args);
}
static void atombios_set_ss(struct drm_crtc *crtc, int enable)
{
struct radeon_crtc *radeon_crtc = to_radeon_crtc(crtc);
struct drm_device *dev = crtc->dev;
struct radeon_device *rdev = dev->dev_private;
struct drm_encoder *encoder = NULL;
struct radeon_encoder *radeon_encoder = NULL;
struct radeon_encoder_atom_dig *dig = NULL;
int index = GetIndexIntoMasterTable(COMMAND, EnableSpreadSpectrumOnPPLL);
ENABLE_SPREAD_SPECTRUM_ON_PPLL_PS_ALLOCATION args;
ENABLE_LVDS_SS_PARAMETERS legacy_args;
uint16_t percentage = 0;
uint8_t type = 0, step = 0, delay = 0, range = 0;
list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
if (encoder->crtc == crtc) {
radeon_encoder = to_radeon_encoder(encoder);
dig = radeon_encoder->enc_priv;
/* only enable spread spectrum on LVDS */
if (dig && dig->ss) {
percentage = dig->ss->percentage;
type = dig->ss->type;
step = dig->ss->step;
delay = dig->ss->delay;
range = dig->ss->range;
} else if (enable)
return;
break;
}
}
if (!radeon_encoder)
return;
if (ASIC_IS_AVIVO(rdev)) {
memset(&args, 0, sizeof(args));
args.usSpreadSpectrumPercentage = percentage;
args.ucSpreadSpectrumType = type;
args.ucSpreadSpectrumStep = step;
args.ucSpreadSpectrumDelay = delay;
args.ucSpreadSpectrumRange = range;
args.ucPpll = radeon_crtc->crtc_id ? ATOM_PPLL2 : ATOM_PPLL1;
args.ucEnable = enable;
atom_execute_table(rdev->mode_info.atom_context, index, (uint32_t *)&args);
} else {
memset(&legacy_args, 0, sizeof(legacy_args));
legacy_args.usSpreadSpectrumPercentage = percentage;
legacy_args.ucSpreadSpectrumType = type;
legacy_args.ucSpreadSpectrumStepSize_Delay = (step & 3) << 2;
legacy_args.ucSpreadSpectrumStepSize_Delay |= (delay & 7) << 4;
legacy_args.ucEnable = enable;
atom_execute_table(rdev->mode_info.atom_context, index, (uint32_t *)&legacy_args);
}
}
void atombios_crtc_set_pll(struct drm_crtc *crtc, struct drm_display_mode *mode)
{
struct radeon_crtc *radeon_crtc = to_radeon_crtc(crtc);
@ -373,8 +428,6 @@ void atombios_crtc_set_pll(struct drm_crtc *crtc, struct drm_display_mode *mode)
memset(&args, 0, sizeof(args));
if (ASIC_IS_AVIVO(rdev)) {
uint32_t ss_cntl;
if ((rdev->family == CHIP_RS600) ||
(rdev->family == CHIP_RS690) ||
(rdev->family == CHIP_RS740))
@ -385,15 +438,6 @@ void atombios_crtc_set_pll(struct drm_crtc *crtc, struct drm_display_mode *mode)
pll_flags |= RADEON_PLL_PREFER_HIGH_FB_DIV;
else
pll_flags |= RADEON_PLL_PREFER_LOW_REF_DIV;
/* disable spread spectrum clocking for now -- thanks Hedy Lamarr */
if (radeon_crtc->crtc_id == 0) {
ss_cntl = RREG32(AVIVO_P1PLL_INT_SS_CNTL);
WREG32(AVIVO_P1PLL_INT_SS_CNTL, ss_cntl & ~1);
} else {
ss_cntl = RREG32(AVIVO_P2PLL_INT_SS_CNTL);
WREG32(AVIVO_P2PLL_INT_SS_CNTL, ss_cntl & ~1);
}
} else {
pll_flags |= RADEON_PLL_LEGACY;
@ -641,7 +685,9 @@ int atombios_crtc_mode_set(struct drm_crtc *crtc,
/* TODO color tiling */
atombios_set_ss(crtc, 0);
atombios_crtc_set_pll(crtc, adjusted_mode);
atombios_set_ss(crtc, 1);
atombios_crtc_set_timing(crtc, adjusted_mode);
if (ASIC_IS_AVIVO(rdev))

42
drivers/gpu/drm/radeon/radeon_atombios.c
View file

@ -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;

11
drivers/gpu/drm/radeon/radeon_mode.h
View file

@ -260,6 +260,16 @@ struct radeon_encoder_int_tmds {
struct radeon_tmds_pll tmds_pll[4];
};
/* spread spectrum */
struct radeon_atom_ss {
uint16_t percentage;
uint8_t type;
uint8_t step;
uint8_t delay;
uint8_t range;
uint8_t refdiv;
};
struct radeon_encoder_atom_dig {
/* atom dig */
bool coherent_mode;
@ -267,6 +277,7 @@ struct radeon_encoder_atom_dig {
/* atom lvds */
uint32_t lvds_misc;
uint16_t panel_pwr_delay;
struct radeon_atom_ss *ss;
/* panel mode */
struct drm_display_mode native_mode;
};