1 files changed, 72 insertions, 0 deletions
diff --git a/meta-amd-bsp/recipes-kernel/linux/linux-yocto-4.14.71/2912-drm-amd-display-Use-macro-for-isnan-check.patch b/meta-amd-bsp/recipes-kernel/linux/linux-yocto-4.14.71/2912-drm-amd-display-Use-macro-for-isnan-check.patch
new file mode 100644
index 00000000..13cc9041
--- /dev/null
+++ b/meta-amd-bsp/recipes-kernel/linux/linux-yocto-4.14.71/2912-drm-amd-display-Use-macro-for-isnan-check.patch
@@ -0,0 +1,72 @@
+From 595cb55c7f03860e304e6c2782f72da042ccdc09 Mon Sep 17 00:00:00 2001
+From: Harry Wentland <harry.wentland@amd.com>
+Date: Wed, 29 Nov 2017 10:16:51 -0500
+Subject: [PATCH 2912/4131] drm/amd/display: Use macro for isnan check
+
+In code provided by HW teams we do a NaN check on floats
+by comparing the number against itself. This confuses most
+people including myself. Macro it out to make it self-explanatory.
+
+Don't do a NaN check for int.
+
+v2: parantheses around 'number' expression
+
+Signed-off-by: Harry Wentland <harry.wentland@amd.com>
+Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
+---
+ drivers/gpu/drm/amd/display/dc/calcs/dcn_calc_math.c | 18 ++++++++----------
+ 1 file changed, 8 insertions(+), 10 deletions(-)
+
+diff --git a/drivers/gpu/drm/amd/display/dc/calcs/dcn_calc_math.c b/drivers/gpu/drm/amd/display/dc/calcs/dcn_calc_math.c
+index b6abe0f..ae38cdb 100644
+--- a/drivers/gpu/drm/amd/display/dc/calcs/dcn_calc_math.c
++++ b/drivers/gpu/drm/amd/display/dc/calcs/dcn_calc_math.c
+@@ -25,37 +25,35 @@
+ 
+ #include "dcn_calc_math.h"
+ 
++#define isNaN(number) ((number) != (number))
++
+ float dcn_bw_mod(const float arg1, const float arg2)
+ {
+-	if (arg1 != arg1)
++	if (isNaN(arg1))
+ 		return arg2;
+-	if (arg2 != arg2)
++	if (isNaN(arg2))
+ 		return arg1;
+ 	return arg1 - arg1 * ((int) (arg1 / arg2));
+ }
+ 
+ float dcn_bw_min2(const float arg1, const float arg2)
+ {
+-	if (arg1 != arg1)
++	if (isNaN(arg1))
+ 		return arg2;
+-	if (arg2 != arg2)
++	if (isNaN(arg2))
+ 		return arg1;
+ 	return arg1 < arg2 ? arg1 : arg2;
+ }
+ 
+ unsigned int dcn_bw_max(const unsigned int arg1, const unsigned int arg2)
+ {
+-	if (arg1 != arg1)
+-		return arg2;
+-	if (arg2 != arg2)
+-		return arg1;
+ 	return arg1 > arg2 ? arg1 : arg2;
+ }
+ float dcn_bw_max2(const float arg1, const float arg2)
+ {
+-	if (arg1 != arg1)
++	if (isNaN(arg1))
+ 		return arg2;
+-	if (arg2 != arg2)
++	if (isNaN(arg2))
+ 		return arg1;
+ 	return arg1 > arg2 ? arg1 : arg2;
+ }
+-- 
+2.7.4
+