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drm/nouveau/kms: allow 225/297MHz pixel clocks for HDMI on Fermi/Kepler

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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 <imirkin@alum.mit.edu>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
This commit is contained in:
Ilia Mirkin 2015-11-03 21:00:11 -05:00 committed by Ben Skeggs
parent 16ef53a93c
commit 1a0c96c075
1 changed files with 21 additions and 3 deletions
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24
drivers/gpu/drm/nouveau/nouveau_connector.c
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@ -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: