From 92891e45c313e22095c90eb36b283a3b39e90bd4 Mon Sep 17 00:00:00 2001 From: =?utf8?q?Ville=20Syrj=C3=A4l=C3=A4?= Date: Wed, 11 May 2016 22:44:45 +0300 Subject: [PATCH] drm/i915: Use skl_cdclk_decimal() on bxt MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit Both SKL and BXT need to fill in the "decimal" cdclk frequency into the CDCLK_CTL register. SKL uses a small helper to do the kHz->"decimal" conversion, whereas BXT has it open-coded. Use the helper on BXT too. While at it, change it to round to closest rather than down. It doesn't actually matter with the frequencies we have to deal with, but it seems like the right thing to do. Signed-off-by: Ville Syrjälä Link: http://patchwork.freedesktop.org/patch/msgid/1462995892-32416-7-git-send-email-ville.syrjala@linux.intel.com Reviewed-by: Jani Nikula --- drivers/gpu/drm/i915/intel_display.c | 14 +++++++------- 1 file changed, 7 insertions(+), 7 deletions(-) diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c index c111ebcff36b..d837bc4a7e39 100644 --- a/drivers/gpu/drm/i915/intel_display.c +++ b/drivers/gpu/drm/i915/intel_display.c @@ -5336,6 +5336,12 @@ static void intel_update_cdclk(struct drm_device *dev) intel_update_max_cdclk(dev); } +/* convert from kHz to .1 fixpoint MHz with -1MHz offset */ +static int skl_cdclk_decimal(int cdclk) +{ + return DIV_ROUND_CLOSEST(cdclk - 1000, 500); +} + static void broxton_set_cdclk(struct drm_i915_private *dev_priv, int frequency) { uint32_t divider; @@ -5435,8 +5441,7 @@ static void broxton_set_cdclk(struct drm_i915_private *dev_priv, int frequency) val |= BXT_CDCLK_SSA_PRECHARGE_ENABLE; val &= ~CDCLK_FREQ_DECIMAL_MASK; - /* convert from kHz to .1 fixpoint MHz with -1MHz offset */ - val |= (frequency - 1000) / 500; + val |= skl_cdclk_decimal(frequency); I915_WRITE(CDCLK_CTL, val); } @@ -5536,11 +5541,6 @@ static const struct skl_cdclk_entry { { .freq = 675000, .vco = 8100 }, }; -static unsigned int skl_cdclk_decimal(unsigned int freq) -{ - return (freq - 1000) / 500; -} - static unsigned int skl_cdclk_get_vco(unsigned int freq) { unsigned int i; -- 2.20.1