[PATCH i-g-t 1/2] lib/kms: Add a way to override an output's mode

[Ander Conselvan de Oliveira <ander.conselvan.de.oliveira@xxxxxxxxx>]

So that it is possible to use a custom mode with the simplified mode set API.

v2: Add documentation for igt_output_override_mode(). (Thomas)
---
 lib/igt_kms.c | 18 ++++++++++++++++++
 lib/igt_kms.h |  3 +++
 2 files changed, 21 insertions(+)

diff --git a/lib/igt_kms.c b/lib/igt_kms.c
index 6cb1f08..9cdb204 100644
--- a/lib/igt_kms.c
+++ b/lib/igt_kms.c
@@ -905,6 +905,9 @@ static void igt_output_refresh(igt_output_t *output)
 	if (!output->valid)
 		return;
 
+	if (output->use_override_mode)
+		output->config.default_mode = output->override_mode;
+
 	if (!output->name) {
 		drmModeConnector *c = output->config.connector;
 
@@ -1656,6 +1659,21 @@ drmModeModeInfo *igt_output_get_mode(igt_output_t *output)
 	return &output->config.default_mode;
 }
 
+/**
+ * igt_output_override_mode:
+ * @output: Output of which the mode will be overriden
+ * @mode: New mode
+ *
+ * Overrides the output's mode with @mode, so that it is used instead of the
+ * mode obtained with get connectors. Note that the mode is used without
+ * checking if the output supports it, so this might lead to unexpect results.
+ */
+void igt_output_override_mode(igt_output_t *output, drmModeModeInfo *mode)
+{
+	output->override_mode = *mode;
+	output->use_override_mode = true;
+}
+
 void igt_output_set_pipe(igt_output_t *output, enum pipe pipe)
 {
 	igt_display_t *display = output->display;
diff --git a/lib/igt_kms.h b/lib/igt_kms.h
index 565df14..067402c 100644
--- a/lib/igt_kms.h
+++ b/lib/igt_kms.h
@@ -217,6 +217,8 @@ typedef struct {
 	char *name;
 	bool valid;
 	unsigned long pending_crtc_idx_mask;
+	bool use_override_mode;
+	drmModeModeInfo override_mode;
 } igt_output_t;
 
 struct igt_display {
@@ -239,6 +241,7 @@ int  igt_display_get_n_pipes(igt_display_t *display);
 
 const char *igt_output_name(igt_output_t *output);
 drmModeModeInfo *igt_output_get_mode(igt_output_t *output);
+void igt_output_override_mode(igt_output_t *output, drmModeModeInfo *mode);
 void igt_output_set_pipe(igt_output_t *output, enum pipe pipe);
 igt_plane_t *igt_output_get_plane(igt_output_t *output, enum igt_plane plane);
 
-- 
2.1.0

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