From: Nicholas Mc Guire Date: Fri, 16 Dec 2016 01:59:38 +0000 (+0100) Subject: drm/i915: relax uncritical udelay_range() X-Git-Tag: v4.11-rc1~83^2~47^2~93 X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=15a43cbf4736a3932e6259fa7d6e47558f6222b0;p=karo-tx-linux.git drm/i915: relax uncritical udelay_range() udelay_range(1, 2) is inefficient and as discussions with Jani Nikula unnecessary here. This replaces this tight setting with a relaxed delay of min=20 and max=50 which helps the hrtimer subsystem optimize timer handling. Fixes: commit be4fc046bed3 ("drm/i915: add VLV DSI PLL Calculations") Link: http://lkml.org/lkml/2016/12/15/147 Signed-off-by: Nicholas Mc Guire Reviewed-by: Jani Nikula Signed-off-by: Jani Nikula Link: http://patchwork.freedesktop.org/patch/msgid/1481853578-19834-1-git-send-email-hofrat@osadl.org --- diff --git a/drivers/gpu/drm/i915/intel_dsi_pll.c b/drivers/gpu/drm/i915/intel_dsi_pll.c index cf8c1b0c30d6..61440e5c2563 100644 --- a/drivers/gpu/drm/i915/intel_dsi_pll.c +++ b/drivers/gpu/drm/i915/intel_dsi_pll.c @@ -156,8 +156,10 @@ static void vlv_enable_dsi_pll(struct intel_encoder *encoder, vlv_cck_write(dev_priv, CCK_REG_DSI_PLL_CONTROL, config->dsi_pll.ctrl & ~DSI_PLL_VCO_EN); - /* wait at least 0.5 us after ungating before enabling VCO */ - usleep_range(1, 10); + /* wait at least 0.5 us after ungating before enabling VCO, + * allow hrtimer subsystem optimization by relaxing timing + */ + usleep_range(10, 50); vlv_cck_write(dev_priv, CCK_REG_DSI_PLL_CONTROL, config->dsi_pll.ctrl);