From: Ville Syrjälä Date: Mon, 30 Nov 2015 14:23:46 +0000 (+0200) Subject: drm/i915: Round the AUX clock divider to closest on all platforms X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=fce18c4cf5fac09153dff8c8726d1eabd02e59ea;p=linux-beck.git drm/i915: Round the AUX clock divider to closest on all platforms Currently we round the AUX clock divider down on g4x, to closest on HSW/BDW port A, and up everywhere else. We are supposed to get as close to 2MHz as we can, so round to closest seems like the best option. Signed-off-by: Ville Syrjälä Link: http://patchwork.freedesktop.org/patch/msgid/1448893432-6978-6-git-send-email-ville.syrjala@linux.intel.com Reviewed-by: Jani Nikula --- diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c index 02bddb02e4da..7e3ffc30a00e 100644 --- a/drivers/gpu/drm/i915/intel_dp.c +++ b/drivers/gpu/drm/i915/intel_dp.c @@ -681,7 +681,7 @@ static uint32_t i9xx_get_aux_clock_divider(struct intel_dp *intel_dp, int index) * The clock divider is based off the hrawclk, and would like to run at * 2MHz. So, take the hrawclk value and divide by 2 and use that */ - return index ? 0 : intel_hrawclk(dev) / 2; + return index ? 0 : DIV_ROUND_CLOSEST(intel_hrawclk(dev), 2); } static uint32_t ilk_get_aux_clock_divider(struct intel_dp *intel_dp, int index) @@ -694,10 +694,10 @@ static uint32_t ilk_get_aux_clock_divider(struct intel_dp *intel_dp, int index) return 0; if (intel_dig_port->port == PORT_A) { - return DIV_ROUND_UP(dev_priv->cdclk_freq, 2000); + return DIV_ROUND_CLOSEST(dev_priv->cdclk_freq, 2000); } else { - return DIV_ROUND_UP(intel_pch_rawclk(dev), 2); + return DIV_ROUND_CLOSEST(intel_pch_rawclk(dev), 2); } } @@ -719,7 +719,7 @@ static uint32_t hsw_get_aux_clock_divider(struct intel_dp *intel_dp, int index) default: return 0; } } else { - return index ? 0 : DIV_ROUND_UP(intel_pch_rawclk(dev), 2); + return index ? 0 : DIV_ROUND_CLOSEST(intel_pch_rawclk(dev), 2); } }