For the scenario where user may require to modeset with a mode supporting a fractional value for vertical refresh-rate, appropriate mode can be selected by searching for mode having matching fractional vertical refresh rate using below equation.
vrefresh = (1000 * pixel clock) / (htotal * vtotal) Hz.
We do this way since driver doesn't return float value of vrefresh as it use int for vrefresh in struct drm_mode_info, but we can derive the actual value using pixel clock, horizontal total size and vertical total size values.
So for e.g. if user want to select mode having 59.94 Hz as refresh rate then with this patch it be can done as shown in below command, given there is an appropriate mode is available :
modetest -M xlnx -s 39:1920x1080-59.94@BG24 -v
NOTE: Above command was tested on xilinx DRM driver with DP monitor which was supporting mode having 59.94 Hz refresh rate.
Signed-off-by: Devarsh Thakkar devarsh.thakkar@xilinx.com --- V2: Update commit message --- tests/modetest/modetest.c | 32 ++++++++++++++++++++++++-------- 1 file changed, 24 insertions(+), 8 deletions(-)
diff --git a/tests/modetest/modetest.c b/tests/modetest/modetest.c index e66be66..9b3e410 100644 --- a/tests/modetest/modetest.c +++ b/tests/modetest/modetest.c @@ -795,7 +795,7 @@ struct pipe_arg { uint32_t crtc_id; char mode_str[64]; char format_str[5]; - unsigned int vrefresh; + float vrefresh; unsigned int fourcc; drmModeModeInfo *mode; struct crtc *crtc; @@ -822,11 +822,12 @@ struct plane_arg {
static drmModeModeInfo * connector_find_mode(struct device *dev, uint32_t con_id, const char *mode_str, - const unsigned int vrefresh) + const float vrefresh) { drmModeConnector *connector; drmModeModeInfo *mode; int i; + float mode_vrefresh;
connector = get_connector_by_id(dev, con_id); if (!connector || !connector->count_modes) @@ -839,9 +840,19 @@ connector_find_mode(struct device *dev, uint32_t con_id, const char *mode_str, * first mode that match with the name. Else, return the mode that match * the name and the specified vertical refresh frequency. */ + float temp; + + mode_vrefresh = ((float)(mode->clock) * 1000.00) + / ((float)(mode->htotal) + * (float)mode->vtotal); + /* Round off to 2 decimal places to match with user + * provided value + */ + temp = (int) (mode_vrefresh * 100 + 0.5); + mode_vrefresh = (float) temp / 100; if (vrefresh == 0) return mode; - else if (mode->vrefresh == vrefresh) + else if (mode_vrefresh == vrefresh) return mode; } } @@ -1393,8 +1404,8 @@ static void atomic_set_mode(struct device *dev, struct pipe_arg *pipes, unsigned if (pipe->mode == NULL) continue;
- printf("setting mode %s-%dHz on connectors ", - pipe->mode_str, pipe->mode->vrefresh); + printf("setting mode %s-%.2fHz on connectors ", + pipe->mode_str, pipe->vrefresh); for (j = 0; j < pipe->num_cons; ++j) { printf("%s, ", pipe->cons[j]); add_property(dev, pipe->con_ids[j], "CRTC_ID", pipe->crtc->crtc->crtc_id); @@ -1476,8 +1487,8 @@ static void set_mode(struct device *dev, struct pipe_arg *pipes, unsigned int co if (pipe->mode == NULL) continue;
- printf("setting mode %s-%dHz@%s on connectors ", - pipe->mode_str, pipe->mode->vrefresh, pipe->format_str); + printf("setting mode %s-%.2fHz@%s on connectors ", + pipe->mode_str, pipe->vrefresh, pipe->format_str); for (j = 0; j < pipe->num_cons; ++j) printf("%s, ", pipe->cons[j]); printf("crtc %d\n", pipe->crtc->crtc->crtc_id); @@ -1713,8 +1724,13 @@ static int parse_connector(struct pipe_arg *pipe, const char *arg) pipe->mode_str[len] = '\0';
if (*p == '-') { - pipe->vrefresh = strtoul(p + 1, &endp, 10); + float temp; + + pipe->vrefresh = strtof(p + 1, &endp); p = endp; + /* Round off to 2 decimal places */ + temp = (int) (pipe->vrefresh * 100 + 0.5); + pipe->vrefresh = (float) temp / 100; }
if (*p == '@') { -- 2.7.4
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