[PATCH 2/2] drm/nouveau: increase max pixel clock to 225 MHZ for HDMI

[Hauke Mehrtens]

The Nvidia blob allows a pixel clock up to 225 MHz in version 346.59,
but only allowed 165MHz in version 295 for HDMI connections. This was
tested with a GF114 (Nvidia GTX 560 TI) and a HDMI monitor which used
225 MHz pixel clock and a signal link DVI monitor with a pixel clock of
less than 165 MHz. This should also be tested with some other device,
but I only have this one graphics card.

The HDMI standard <= 1.2 allowed a maximal pixel clock of 165 MHz and
the HDMI standard >= 1.3 allows a maximal pixel clock of 340 MHz. One
DVI link only allows a maximum clock of 165 MHz, so this should only be
changed for HDMI.

My assumption is that all Nvidia cards with HDMI support a Pixel clock
of 225 MHz, but I haven't tested this

Signed-off-by: Hauke Mehrtens <hauke at hauke-m.de>
---
 drivers/gpu/drm/nouveau/nouveau_connector.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/nouveau/nouveau_connector.c b/drivers/gpu/drm/nouveau/nouveau_connector.c
index 3162040..9191545b 100644
--- a/drivers/gpu/drm/nouveau/nouveau_connector.c
+++ b/drivers/gpu/drm/nouveau/nouveau_connector.c
@@ -815,8 +815,10 @@ get_tmds_link_bandwidth(struct drm_connector *connector)
 	struct nouveau_drm *drm = nouveau_drm(connector->dev);
 	struct dcb_output *dcb = nv_connector->detected_encoder->dcb;
 
-	if (dcb->location != DCB_LOC_ON_CHIP ||
-	    drm->device.info.chipset >= 0x46)
+	if (drm_detect_hdmi_monitor(nv_connector->edid))
+		return 225000;
+	else if (dcb->location != DCB_LOC_ON_CHIP ||
+		 drm->device.info.chipset >= 0x46)
 		return 165000;
 	else if (drm->device.info.chipset >= 0x40)
 		return 155000;
-- 
2.1.4