[PATCH 08/16] drm/amd/display: Correct unit conversion for vstartup

[Wayne Lin]

From: Reza Amini <reza.am...@amd.com>

[why]
vstartup is calculated to be a large number. it works because
it is within vertical blank, but it reduces region of blank that
can be used for power gating.

[how]
Calculation needs to convert micro seconds to number of
vertical lines.

Reviewed-by: Kazlauskas Nicholas <nicholas.kazlaus...@amd.com>
Acked-by: Wayne Lin <wayne....@amd.com>
Signed-off-by: Reza Amini <reza.am...@amd.com>
---
 .../amd/display/dc/dml/dcn314/dcn314_fpu.c    | 25 ++++++++++++++++++-
 1 file changed, 24 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/display/dc/dml/dcn314/dcn314_fpu.c 
b/drivers/gpu/drm/amd/display/dc/dml/dcn314/dcn314_fpu.c
index ed8ddb75b333..07adb614366e 100644
--- a/drivers/gpu/drm/amd/display/dc/dml/dcn314/dcn314_fpu.c
+++ b/drivers/gpu/drm/amd/display/dc/dml/dcn314/dcn314_fpu.c
@@ -31,6 +31,7 @@
 #include "dml/dcn20/dcn20_fpu.h"
 #include "dml/dcn31/dcn31_fpu.h"
 #include "dml/display_mode_vba.h"
+#include "dml/dml_inline_defs.h"
 
 struct _vcs_dpi_ip_params_st dcn3_14_ip = {
        .VBlankNomDefaultUS = 668,
@@ -273,6 +274,25 @@ static bool is_dual_plane(enum surface_pixel_format format)
        return format >= SURFACE_PIXEL_FORMAT_VIDEO_BEGIN || format == 
SURFACE_PIXEL_FORMAT_GRPH_RGBE_ALPHA;
 }
 
+/*
+ * micro_sec_to_vert_lines () - converts time to number of vertical lines for 
a given timing
+ *
+ * @param: num_us: number of microseconds
+ * @return: number of vertical lines. If exact number of vertical lines is not 
found then
+ *          it will round up to next number of lines to guarantee num_us
+ */
+static unsigned int micro_sec_to_vert_lines(unsigned int num_us, struct 
dc_crtc_timing *timing)
+{
+       unsigned int num_lines = 0;
+       unsigned int lines_time_in_ns = 1000.0 *
+                       (((float)timing->h_total * 1000.0) /
+                        ((float)timing->pix_clk_100hz / 10.0));
+
+       num_lines = dml_ceil(1000.0 * num_us / lines_time_in_ns, 1.0);
+
+       return num_lines;
+}
+
 int dcn314_populate_dml_pipes_from_context_fpu(struct dc *dc, struct dc_state 
*context,
                                               display_e2e_pipe_params_st 
*pipes,
                                               bool fast_validate)
@@ -289,19 +309,22 @@ int dcn314_populate_dml_pipes_from_context_fpu(struct dc 
*dc, struct dc_state *c
 
        for (i = 0, pipe_cnt = 0; i < dc->res_pool->pipe_count; i++) {
                struct dc_crtc_timing *timing;
+               unsigned int num_lines = 0;
 
                if (!res_ctx->pipe_ctx[i].stream)
                        continue;
                pipe = &res_ctx->pipe_ctx[i];
                timing = &pipe->stream->timing;
 
+               num_lines = 
micro_sec_to_vert_lines(dcn3_14_ip.VBlankNomDefaultUS, timing);
+
                if (pipe->stream->adjust.v_total_min != 0)
                        pipes[pipe_cnt].pipe.dest.vtotal = 
pipe->stream->adjust.v_total_min;
                else
                        pipes[pipe_cnt].pipe.dest.vtotal = timing->v_total;
 
                pipes[pipe_cnt].pipe.dest.vblank_nom = timing->v_total - 
pipes[pipe_cnt].pipe.dest.vactive;
-               pipes[pipe_cnt].pipe.dest.vblank_nom = 
min(pipes[pipe_cnt].pipe.dest.vblank_nom, dcn3_14_ip.VBlankNomDefaultUS);
+               pipes[pipe_cnt].pipe.dest.vblank_nom = 
min(pipes[pipe_cnt].pipe.dest.vblank_nom, num_lines);
                pipes[pipe_cnt].pipe.dest.vblank_nom = 
max(pipes[pipe_cnt].pipe.dest.vblank_nom, timing->v_sync_width);
                pipes[pipe_cnt].pipe.dest.vblank_nom = 
min(pipes[pipe_cnt].pipe.dest.vblank_nom, max_allowed_vblank_nom);
 
-- 
2.37.3