From: Ville Syrjälä Date: Tue, 28 May 2024 18:56:46 +0000 (+0300) Subject: drm/i915: Switch intel_usecs_to_scanlines() to 64bit maths X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=d3e80f2dcf8c2aae09eca6b394eb253505e37dda;p=linux.git drm/i915: Switch intel_usecs_to_scanlines() to 64bit maths Dotclocks can reach ~1GHz these days, so intel_usecs_to_scanlines(), with its 32bit maths, is currently limited to a few milliseconds. I want bigger numbers in DSB selftests, so switch over to 64bit maths. Signed-off-by: Ville Syrjälä Link: https://patchwork.freedesktop.org/patch/msgid/20240528185647.7765-7-ville.syrjala@linux.intel.com Reviewed-by: Jani Nikula --- diff --git a/drivers/gpu/drm/i915/display/intel_crtc.c b/drivers/gpu/drm/i915/display/intel_crtc.c index bf6e74e99f5c..54b529bfc935 100644 --- a/drivers/gpu/drm/i915/display/intel_crtc.c +++ b/drivers/gpu/drm/i915/display/intel_crtc.c @@ -454,8 +454,8 @@ int intel_usecs_to_scanlines(const struct drm_display_mode *adjusted_mode, if (!adjusted_mode->crtc_htotal) return 1; - return DIV_ROUND_UP(usecs * adjusted_mode->crtc_clock, - 1000 * adjusted_mode->crtc_htotal); + return DIV_ROUND_UP_ULL(mul_u32_u32(usecs, adjusted_mode->crtc_clock), + 1000 * adjusted_mode->crtc_htotal); } /**