From c4756baa4a8ba75b812506818cbc81178650d3c1 Mon Sep 17 00:00:00 2001 From: Alex Deucher Date: Wed, 15 Jan 2014 13:59:47 -0500 Subject: [PATCH] drm/radeon: bail early from enable ss in certain cases If the ss percentage is 0 or we are using external ss, just bail when enabling ss. We disable it explicitly earlier in the modeset already. Signed-off-by: Alex Deucher --- drivers/gpu/drm/radeon/atombios_crtc.c | 19 ++++++++++++------- 1 file changed, 12 insertions(+), 7 deletions(-) diff --git a/drivers/gpu/drm/radeon/atombios_crtc.c b/drivers/gpu/drm/radeon/atombios_crtc.c index fd9daf4022a1..4cf678306c9c 100644 --- a/drivers/gpu/drm/radeon/atombios_crtc.c +++ b/drivers/gpu/drm/radeon/atombios_crtc.c @@ -423,7 +423,17 @@ static void atombios_crtc_program_ss(struct radeon_device *rdev, int index = GetIndexIntoMasterTable(COMMAND, EnableSpreadSpectrumOnPPLL); union atom_enable_ss args; - if (!enable) { + if (enable) { + /* Don't mess with SS if percentage is 0 or external ss. + * SS is already disabled previously, and disabling it + * again can cause display problems if the pll is already + * programmed. + */ + if (ss->percentage == 0) + return; + if (ss->type & ATOM_EXTERNAL_SS_MASK) + return; + } else { for (i = 0; i < rdev->num_crtc; i++) { if (rdev->mode_info.crtcs[i] && rdev->mode_info.crtcs[i]->enabled && @@ -459,8 +469,6 @@ static void atombios_crtc_program_ss(struct radeon_device *rdev, args.v3.usSpreadSpectrumAmount = cpu_to_le16(ss->amount); args.v3.usSpreadSpectrumStep = cpu_to_le16(ss->step); args.v3.ucEnable = enable; - if ((ss->percentage == 0) || (ss->type & ATOM_EXTERNAL_SS_MASK) || ASIC_IS_DCE61(rdev)) - args.v3.ucEnable = ATOM_DISABLE; } else if (ASIC_IS_DCE4(rdev)) { args.v2.usSpreadSpectrumPercentage = cpu_to_le16(ss->percentage); args.v2.ucSpreadSpectrumType = ss->type & ATOM_SS_CENTRE_SPREAD_MODE_MASK; @@ -480,8 +488,6 @@ static void atombios_crtc_program_ss(struct radeon_device *rdev, args.v2.usSpreadSpectrumAmount = cpu_to_le16(ss->amount); args.v2.usSpreadSpectrumStep = cpu_to_le16(ss->step); args.v2.ucEnable = enable; - if ((ss->percentage == 0) || (ss->type & ATOM_EXTERNAL_SS_MASK) || ASIC_IS_DCE41(rdev)) - args.v2.ucEnable = ATOM_DISABLE; } else if (ASIC_IS_DCE3(rdev)) { args.v1.usSpreadSpectrumPercentage = cpu_to_le16(ss->percentage); args.v1.ucSpreadSpectrumType = ss->type & ATOM_SS_CENTRE_SPREAD_MODE_MASK; @@ -503,8 +509,7 @@ static void atombios_crtc_program_ss(struct radeon_device *rdev, args.lvds_ss_2.ucSpreadSpectrumRange = ss->range; args.lvds_ss_2.ucEnable = enable; } else { - if ((enable == ATOM_DISABLE) || (ss->percentage == 0) || - (ss->type & ATOM_EXTERNAL_SS_MASK)) { + if (enable == ATOM_DISABLE) { atombios_disable_ss(rdev, pll_id); return; } -- 2.34.1