From cee991cb9323995b5c1e5f39540b6055ca5e73e4 Mon Sep 17 00:00:00 2001 From: Akash Goel Date: Fri, 6 Mar 2015 11:07:16 +0530 Subject: [PATCH] drm/i915/skl: Updated the gen6_init_rps_frequencies function MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit On SKL the frequency is specified in units of 16.66 MHZ, barring the RP_STATE_CAP(0x5998) register, which still reports frequency in units of 50 MHZ. So an extra conversion is required in gen6_init_rps_frequencies function for SKL, to store the frequency values as per the actual hardware unit. v2: Corrected the conversion from 50 to 16.66 MHZ (Ville) Signed-off-by: Akash Goel Reviewed-by: Ville Syrjälä Signed-off-by: Daniel Vetter --- drivers/gpu/drm/i915/intel_pm.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c index c0901ec47bcf..f240e8578e00 100644 --- a/drivers/gpu/drm/i915/intel_pm.c +++ b/drivers/gpu/drm/i915/intel_pm.c @@ -4181,6 +4181,13 @@ static void gen6_init_rps_frequencies(struct drm_device *dev) dev_priv->rps.rp0_freq = (rp_state_cap >> 0) & 0xff; dev_priv->rps.rp1_freq = (rp_state_cap >> 8) & 0xff; dev_priv->rps.min_freq = (rp_state_cap >> 16) & 0xff; + if (IS_SKYLAKE(dev)) { + /* Store the frequency values in 16.66 MHZ units, which is + the natural hardware unit for SKL */ + dev_priv->rps.rp0_freq *= GEN9_FREQ_SCALER; + dev_priv->rps.rp1_freq *= GEN9_FREQ_SCALER; + dev_priv->rps.min_freq *= GEN9_FREQ_SCALER; + } /* hw_max = RP0 until we check for overclocking */ dev_priv->rps.max_freq = dev_priv->rps.rp0_freq; -- 2.39.2