From a9419e846bd8c8e00c1d28282de936523229eff7 Mon Sep 17 00:00:00 2001 From: Damien Lespiau Date: Thu, 4 Jun 2015 18:21:30 +0100 Subject: [PATCH] drm/i915/skl: Derive the max CDCLK from DFSM MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit Signed-off-by: Damien Lespiau Reviewed-by: Ville Syrjälä Signed-off-by: Jani Nikula --- drivers/gpu/drm/i915/i915_reg.h | 7 +++++++ drivers/gpu/drm/i915/intel_display.c | 13 ++++++++++++- 2 files changed, 19 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h index 89fd7c8a1525..760dbebc1aef 100644 --- a/drivers/gpu/drm/i915/i915_reg.h +++ b/drivers/gpu/drm/i915/i915_reg.h @@ -5761,6 +5761,13 @@ enum skl_disp_power_wells { #define HSW_NDE_RSTWRN_OPT 0x46408 #define RESET_PCH_HANDSHAKE_ENABLE (1<<4) +#define SKL_DFSM 0x51000 +#define SKL_DFSM_CDCLK_LIMIT_MASK (3 << 23) +#define SKL_DFSM_CDCLK_LIMIT_675 (0 << 23) +#define SKL_DFSM_CDCLK_LIMIT_540 (1 << 23) +#define SKL_DFSM_CDCLK_LIMIT_450 (2 << 23) +#define SKL_DFSM_CDCLK_LIMIT_337_5 (3 << 23) + #define FF_SLICE_CS_CHICKEN2 0x20e4 #define GEN9_TSG_BARRIER_ACK_DISABLE (1<<8) diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c index 7e8b583527e9..9280e76505fc 100644 --- a/drivers/gpu/drm/i915/intel_display.c +++ b/drivers/gpu/drm/i915/intel_display.c @@ -5751,7 +5751,18 @@ static void intel_update_max_cdclk(struct drm_device *dev) { struct drm_i915_private *dev_priv = dev->dev_private; - if (IS_BROADWELL(dev)) { + if (IS_SKYLAKE(dev)) { + u32 limit = I915_READ(SKL_DFSM) & SKL_DFSM_CDCLK_LIMIT_MASK; + + if (limit == SKL_DFSM_CDCLK_LIMIT_675) + dev_priv->max_cdclk_freq = 675000; + else if (limit == SKL_DFSM_CDCLK_LIMIT_540) + dev_priv->max_cdclk_freq = 540000; + else if (limit == SKL_DFSM_CDCLK_LIMIT_450) + dev_priv->max_cdclk_freq = 450000; + else + dev_priv->max_cdclk_freq = 337500; + } else if (IS_BROADWELL(dev)) { /* * FIXME with extra cooling we can allow * 540 MHz for ULX and 675 Mhz for ULT. -- 2.20.1