Hi Shawn, [auto build test WARNING on drm-intel/for-linux-next] [also build test WARNING on v4.8-rc7 next-20160916] [if your patch is applied to the wrong git tree, please drop us a note to help improve the system] [Suggest to use git(>=2.9.0) format-patch --base=<commit> (or --base=auto for convenience) to record what (public, well-known) commit your patch series was built on] [Check https://git-scm.com/docs/git-format-patch for more information]
url: https://github.com/0day-ci/linux/commits/Lee-Shawn-C/drm-i915-Restore-PWM_GRANULARITY-after-resume/20160919-180644 base: git://anongit.freedesktop.org/drm-intel for-linux-next config: x86_64-randconfig-x008-201638 (attached as .config) compiler: gcc-6 (Debian 6.2.0-3) 6.2.0 20160901 reproduce: # save the attached .config to linux build tree make ARCH=x86_64 All warnings (new ones prefixed by >>): In file included from drivers/gpu/drm/i915/intel_drv.h:32:0, from drivers/gpu/drm/i915/intel_panel.c:36: drivers/gpu/drm/i915/intel_panel.c: In function 'lpt_enable_backlight': >> drivers/gpu/drm/i915/intel_panel.c:874:78: warning: left shift count >= >> width of type [-Wshift-count-overflow] I915_WRITE(SOUTH_CHICKEN2, mul | (panel->backlight.pwm_alternate_increment << LPT_PWM_GRANULARITY)); ^ drivers/gpu/drm/i915/i915_drv.h:3735:83: note: in definition of macro 'I915_WRITE' #define I915_WRITE(reg, val) dev_priv->uncore.funcs.mmio_writel(dev_priv, (reg), (val), true) ^~~ vim +874 drivers/gpu/drm/i915/intel_panel.c 858 pch_ctl1 |= BLM_PCH_POLARITY; 859 860 /* After LPT, override is the default. */ 861 if (HAS_PCH_LPT(dev_priv)) 862 pch_ctl1 |= BLM_PCH_OVERRIDE_ENABLE; 863 864 I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1); 865 POSTING_READ(BLC_PWM_PCH_CTL1); 866 I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1 | BLM_PCH_PWM_ENABLE); 867 868 /* This won't stick until the above enable. */ 869 intel_panel_actually_set_backlight(connector, panel->backlight.level); 870 871 if (HAS_PCH_LPT(dev_priv)) { 872 mul = I915_READ(SOUTH_CHICKEN2); 873 mul &= ~LPT_PWM_GRANULARITY; > 874 I915_WRITE(SOUTH_CHICKEN2, mul | > (panel->backlight.pwm_alternate_increment << LPT_PWM_GRANULARITY)); 875 } else { 876 mul = I915_READ(SOUTH_CHICKEN1); 877 mul &= ~SPT_PWM_GRANULARITY; 878 I915_WRITE(SOUTH_CHICKEN1, mul | (panel->backlight.pwm_alternate_increment << SPT_PWM_GRANULARITY)); 879 } 880 } 881 882 static void pch_enable_backlight(struct intel_connector *connector) --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation
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