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drm/i915: Fix 66 MHz LVDS SSC freq for gen2

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Store the SSC refclock frequency in kHz to get more accuracy. Currently
we're pretending that 66 MHz is ~66000 kHz, when in fact it is actually
~66667 kHz. By storing the less rounded kHz value we get a much better
accuracy for out pixel clock calculations.

Cc: Bruno Prémont <bonbons@linux-vserver.org>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Tested-by: Bruno Prémont <bonbons@linux-vserver.org>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Ville Syrjälä 2013-12-09 18:54:16 +02:00 committed by Daniel Vetter
parent c7721d3266
commit e91e941bd5
2 changed files with 10 additions and 11 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
drivers/gpu/drm/i915/intel_bios.c
View File

@ -327,12 +327,12 @@ static int intel_bios_ssc_frequency(struct drm_device *dev,
{
switch (INTEL_INFO(dev)->gen) {
case 2:
return alternate ? 66 : 48;
return alternate ? 66667 : 48000;
case 3:
case 4:
return alternate ? 100 : 96;
return alternate ? 100000 : 96000;
default:
return alternate ? 100 : 120;
return alternate ? 100000 : 120000;
}
}
@ -796,7 +796,7 @@ init_vbt_defaults(struct drm_i915_private *dev_priv)
*/
dev_priv->vbt.lvds_ssc_freq = intel_bios_ssc_frequency(dev,
!HAS_PCH_SPLIT(dev));
DRM_DEBUG_KMS("Set default to SSC at %dMHz\n", dev_priv->vbt.lvds_ssc_freq);
DRM_DEBUG_KMS("Set default to SSC at %d kHz\n", dev_priv->vbt.lvds_ssc_freq);
for (port = PORT_A; port < I915_MAX_PORTS; port++) {
struct ddi_vbt_port_info *info =

13
drivers/gpu/drm/i915/intel_display.c
View File

@ -4761,9 +4761,8 @@ static int i9xx_get_refclk(struct drm_crtc *crtc, int num_connectors)
refclk = 100000;
} else if (intel_pipe_has_type(crtc, INTEL_OUTPUT_LVDS) &&
intel_panel_use_ssc(dev_priv) && num_connectors < 2) {
refclk = dev_priv->vbt.lvds_ssc_freq * 1000;
DRM_DEBUG_KMS("using SSC reference clock of %d MHz\n",
refclk / 1000);
refclk = dev_priv->vbt.lvds_ssc_freq;
DRM_DEBUG_KMS("using SSC reference clock of %d kHz\n", refclk);
} else if (!IS_GEN2(dev)) {
refclk = 96000;
} else {
@ -5909,9 +5908,9 @@ static int ironlake_get_refclk(struct drm_crtc *crtc)
}
if (is_lvds && intel_panel_use_ssc(dev_priv) && num_connectors < 2) {
DRM_DEBUG_KMS("using SSC reference clock of %d MHz\n",
DRM_DEBUG_KMS("using SSC reference clock of %d kHz\n",
dev_priv->vbt.lvds_ssc_freq);
return dev_priv->vbt.lvds_ssc_freq * 1000;
return dev_priv->vbt.lvds_ssc_freq;
}
return 120000;
@ -6173,7 +6172,7 @@ static uint32_t ironlake_compute_dpll(struct intel_crtc *intel_crtc,
factor = 21;
if (is_lvds) {
if ((intel_panel_use_ssc(dev_priv) &&
dev_priv->vbt.lvds_ssc_freq == 100) ||
dev_priv->vbt.lvds_ssc_freq == 100000) ||
(HAS_PCH_IBX(dev) && intel_is_dual_link_lvds(dev)))
factor = 25;
} else if (intel_crtc->config.sdvo_tv_clock)
@ -7888,7 +7887,7 @@ static int i9xx_pll_refclk(struct drm_device *dev,
u32 dpll = pipe_config->dpll_hw_state.dpll;
if ((dpll & PLL_REF_INPUT_MASK) == PLLB_REF_INPUT_SPREADSPECTRUMIN)
return dev_priv->vbt.lvds_ssc_freq * 1000;
return dev_priv->vbt.lvds_ssc_freq;
else if (HAS_PCH_SPLIT(dev))
return 120000;
else if (!IS_GEN2(dev))