drm/amdgpu/display: Add calcs code for DCN

Bandwidth and scaling calculations for DCN.
Signed-off-by: Harry Wentland <harry.wentland@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/dc/calcs/dcn_calc_auto.h

+/*
+ * Copyright 2017 Advanced Micro Devices, Inc.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
+ * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * Authors: AMD
+ *
+ */
+
+#ifndef _DCN_CALC_AUTO_H_
+#define _DCN_CALC_AUTO_H_
+
+#include "dcn_calcs.h"
+
+void scaler_settings_calculation(struct dcn_bw_internal_vars *v);
+void mode_support_and_system_configuration(struct dcn_bw_internal_vars *v);
+void display_pipe_configuration(struct dcn_bw_internal_vars *v);
+void dispclkdppclkdcfclk_deep_sleep_prefetch_parameters_watermarks_and_performance_calculation(
+		struct dcn_bw_internal_vars *v);
+
+#endif /* _DCN_CALC_AUTO_H_ */

drivers/gpu/drm/amd/display/dc/calcs/dcn_calc_math.c

+/*
+ * Copyright 2017 Advanced Micro Devices, Inc.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
+ * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * Authors: AMD
+ *
+ */
+
+#include "dcn_calc_math.h"
+
+float dcn_bw_mod(const float arg1, const float arg2)
+{
+	return arg1 - arg1 * ((int) (arg1 / arg2));
+}
+
+float dcn_bw_min2(const float arg1, const float arg2)
+{
+	return arg1 < arg2 ? arg1 : arg2;
+}
+
+unsigned int dcn_bw_max(const unsigned int arg1, const unsigned int arg2)
+{
+	return arg1 > arg2 ? arg1 : arg2;
+}
+float dcn_bw_max2(const float arg1, const float arg2)
+{
+	return arg1 > arg2 ? arg1 : arg2;
+}
+
+float dcn_bw_floor2(const float arg, const float significance)
+{
+	if (significance == 0)
+		return 0;
+	return ((int) (arg / significance)) * significance;
+}
+
+float dcn_bw_ceil2(const float arg, const float significance)
+{
+	float flr = dcn_bw_floor2(arg, significance);
+	if (significance == 0)
+		return 0;
+	return flr + 0.00001 >= arg ? arg : flr + significance;
+}
+
+float dcn_bw_max3(float v1, float v2, float v3)
+{
+	return v3 > dcn_bw_max2(v1, v2) ? v3 : dcn_bw_max2(v1, v2);
+}
+
+float dcn_bw_max5(float v1, float v2, float v3, float v4, float v5)
+{
+	return dcn_bw_max3(v1, v2, v3) > dcn_bw_max2(v4, v5) ? dcn_bw_max3(v1, v2, v3) : dcn_bw_max2(v4, v5);
+}
+
+float dcn_bw_pow(float a, float exp)
+{
+	float temp;
+	/*ASSERT(exp == (int)exp);*/
+	if ((int)exp == 0)
+		return 1;
+	temp = dcn_bw_pow(a, (int)(exp / 2));
+	if (((int)exp % 2) == 0) {
+		return temp * temp;
+	} else {
+		if ((int)exp > 0)
+			return a * temp * temp;
+		else
+			return (temp * temp) / a;
+	}
+}
+
+float dcn_bw_log(float a, float b)
+{
+	int * const exp_ptr = (int *)(&a);
+	int x = *exp_ptr;
+	const int log_2 = ((x >> 23) & 255) - 128;
+	x &= ~(255 << 23);
+	x += 127 << 23;
+	*exp_ptr = x;
+
+	a = ((-1.0f / 3) * a + 2) * a - 2.0f / 3;
+
+	if (b > 2.00001 || b < 1.99999)
+		return (a + log_2) / dcn_bw_log(b, 2);
+	else
+		return (a + log_2);
+}

drivers/gpu/drm/amd/display/dc/calcs/dcn_calc_math.h

+/*
+ * Copyright 2017 Advanced Micro Devices, Inc.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
+ * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * Authors: AMD
+ *
+ */
+
+#ifndef _DCN_CALC_MATH_H_
+#define _DCN_CALC_MATH_H_
+
+float dcn_bw_mod(const float arg1, const float arg2);
+float dcn_bw_min2(const float arg1, const float arg2);
+unsigned int dcn_bw_max(const unsigned int arg1, const unsigned int arg2);
+float dcn_bw_max2(const float arg1, const float arg2);
+float dcn_bw_floor2(const float arg, const float significance);
+float dcn_bw_ceil2(const float arg, const float significance);
+float dcn_bw_max3(float v1, float v2, float v3);
+float dcn_bw_max5(float v1, float v2, float v3, float v4, float v5);
+float dcn_bw_pow(float a, float exp);
+float dcn_bw_log(float a, float b);
+
+#endif /* _DCN_CALC_MATH_H_ */