[Nouveau] [PATCH v3 2/2] connector: allow 225/297MHz pixel clocks for HDMI on Fermi/Kepler

[Ilia Mirkin]

Some Fermi's apparently alow allow 297MHz clocks, so create a parameter
which allows end-users to set it themselves until we have a reliable way
to determine the board's maximum pixel clocks.

Signed-off-by: Ilia Mirkin <imir...@alum.mit.edu>
---
 drm/nouveau/nouveau_connector.c | 24 +++++++++++++++++++++---
 1 file changed, 21 insertions(+), 3 deletions(-)

diff --git a/drm/nouveau/nouveau_connector.c b/drm/nouveau/nouveau_connector.c
index 4c8f6ef..8dd384b 100644
--- a/drm/nouveau/nouveau_connector.c
+++ b/drm/nouveau/nouveau_connector.c
@@ -56,6 +56,10 @@ MODULE_PARM_DESC(duallink, "Allow dual-link TMDS (default: 
enabled)");
 int nouveau_duallink = 1;
 module_param_named(duallink, nouveau_duallink, int, 0400);
 
+MODULE_PARM_DESC(hdmimhz, "Force a maximum HDMI pixel clock (in MHz)");
+int nouveau_hdmimhz = 0;
+module_param_named(hdmimhz, nouveau_hdmimhz, int, 0400);
+
 struct nouveau_encoder *
 find_encoder(struct drm_connector *connector, int type)
 {
@@ -809,12 +813,23 @@ nouveau_connector_get_modes(struct drm_connector 
*connector)
 }
 
 static unsigned
-get_tmds_link_bandwidth(struct drm_connector *connector)
+get_tmds_link_bandwidth(struct drm_connector *connector, bool hdmi)
 {
        struct nouveau_connector *nv_connector = nouveau_connector(connector);
        struct nouveau_drm *drm = nouveau_drm(connector->dev);
        struct dcb_output *dcb = nv_connector->detected_encoder->dcb;
 
+       if (hdmi) {
+               if (nouveau_hdmimhz > 0)
+                       return nouveau_hdmimhz * 1000;
+               /* Note: these limits are conservative, some Fermi's
+                * can do 297 MHz. Unclear how this can be determined.
+                */
+               if (drm->device.info.family >= NV_DEVICE_INFO_V0_KEPLER)
+                       return 297000;
+               if (drm->device.info.family >= NV_DEVICE_INFO_V0_FERMI)
+                       return 225000;
+       }
        if (dcb->location != DCB_LOC_ON_CHIP ||
            drm->device.info.chipset >= 0x46)
                return 165000;
@@ -835,6 +850,7 @@ nouveau_connector_mode_valid(struct drm_connector 
*connector,
        struct drm_encoder *encoder = to_drm_encoder(nv_encoder);
        unsigned min_clock = 25000, max_clock = min_clock;
        unsigned clock = mode->clock;
+       bool hdmi;
 
        switch (nv_encoder->dcb->type) {
        case DCB_OUTPUT_LVDS:
@@ -847,8 +863,10 @@ nouveau_connector_mode_valid(struct drm_connector 
*connector,
                max_clock = 400000;
                break;
        case DCB_OUTPUT_TMDS:
-               max_clock = get_tmds_link_bandwidth(connector);
-               if (nouveau_duallink && nv_encoder->dcb->duallink_possible)
+               hdmi = drm_detect_hdmi_monitor(nv_connector->edid);
+               max_clock = get_tmds_link_bandwidth(connector, hdmi);
+               if (!hdmi && nouveau_duallink &&
+                   nv_encoder->dcb->duallink_possible)
                        max_clock *= 2;
                break;
        case DCB_OUTPUT_ANALOG:
-- 
2.4.10

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