[PATCH v2] Disable CRTCs when disabling the outputs

[Piotr Redlewski]

When turning the outputs off (DPMSModeOff), CRTCs stayed enabled. This led
to higher gpu temperatures than with fglrx driver.

v2: when entering DPMS also disable active CRTCs

Signed-off-by: Piotr Redlewski <predlewski at gmail.com>
---
 src/drmmode_display.c | 40 +++++++++++++++++++++++++++++++++++++++-
 1 file changed, 39 insertions(+), 1 deletion(-)

diff --git a/src/drmmode_display.c b/src/drmmode_display.c
index 3564853..1ef7c50 100644
--- a/src/drmmode_display.c
+++ b/src/drmmode_display.c
@@ -342,7 +342,45 @@ drmmode_do_crtc_dpms(xf86CrtcPtr crtc, int mode)
 static void
 drmmode_crtc_dpms(xf86CrtcPtr crtc, int mode)
 {
-	/* Nothing to do. drmmode_do_crtc_dpms() is called as appropriate */
+	xf86CrtcConfigPtr xf86_config = XF86_CRTC_CONFIG_PTR(crtc->scrn);
+	drmmode_crtc_private_ptr drmmode_crtc = crtc->driver_private;
+	drmmode_ptr drmmode = drmmode_crtc->drmmode;
+	uint32_t *output_ids;
+	int output_count = 0;
+	drmModeModeInfo kmode;
+	int i;
+
+	/* Disable unused CRTCs */
+	if (!crtc->enabled || mode != DPMSModeOn) {
+		drmModeSetCrtc(drmmode->fd, drmmode_crtc->mode_crtc->crtc_id,
+			       0, 0, 0, NULL, 0, NULL);
+		return;
+	}
+
+	output_ids = calloc(sizeof(uint32_t), xf86_config->num_output);
+	if (!output_ids)
+		return;
+
+	for (i = 0; i < xf86_config->num_output; i++) {
+		xf86OutputPtr output = xf86_config->output[i];
+		drmmode_output_private_ptr drmmode_output;
+
+		if (output->crtc != crtc)
+			continue;
+
+		drmmode_output = output->driver_private;
+		output_ids[output_count]
+			= drmmode_output->mode_output->connector_id;
+		output_count++;
+	}
+
+	drmmode_ConvertToKMode(crtc->scrn, &kmode, &crtc->mode);
+
+	drmModeSetCrtc(drmmode->fd, drmmode_crtc->mode_crtc->crtc_id,
+		       drmmode->fb_id, crtc->x, crtc->y, output_ids,
+		       output_count, &kmode);
+
+	free(output_ids);
 }
 
 static PixmapPtr
-- 
2.4.4