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authorEugeni Dodonov <eugeni.dodonov@intel.com>2012-05-09 15:37:26 -0300
committerDaniel Vetter <daniel.vetter@ffwll.ch>2012-05-19 22:39:49 +0200
commite615efe4b879de87ef6a4192d7e5b0bd0d2e1518 (patch)
treeae7ad10e862c93c940cf1c1dcb0470c64475288e
parent1f8eeabf2e6f4a6cb5afe9e90d2a705e9709f1a1 (diff)
drm/i915: program iCLKIP on Lynx Point
The iCLKIP clock is used to drive the VGA pixel clock on the PCH. In order to do so, it must be programmed to properly do the clock ticks according to the divisor, phase direction, phase increments and a special auxiliary divisor for 20MHz clock. v2: calculate divisor values directly instead of relying on a table. v3: merged a fix from Ben to properly check for invalid divider values. Reviewed-by: Ben Widawsky <ben@bwidawsk.net> Signed-off-by: Eugeni Dodonov <eugeni.dodonov@intel.com> Signed-off-by: Ben Widawsky <ben@bwidawsk.net> Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
-rw-r--r--drivers/gpu/drm/i915/intel_display.c100
1 files changed, 97 insertions, 3 deletions
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index fb3f4aaca2c..f1bb2e2ec17 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -2675,6 +2675,97 @@ static bool intel_crtc_driving_pch(struct drm_crtc *crtc)
return true;
}
+/* Program iCLKIP clock to the desired frequency */
+static void lpt_program_iclkip(struct drm_crtc *crtc)
+{
+ struct drm_device *dev = crtc->dev;
+ struct drm_i915_private *dev_priv = dev->dev_private;
+ u32 divsel, phaseinc, auxdiv, phasedir = 0;
+ u32 temp;
+
+ /* It is necessary to ungate the pixclk gate prior to programming
+ * the divisors, and gate it back when it is done.
+ */
+ I915_WRITE(PIXCLK_GATE, PIXCLK_GATE_GATE);
+
+ /* Disable SSCCTL */
+ intel_sbi_write(dev_priv, SBI_SSCCTL6,
+ intel_sbi_read(dev_priv, SBI_SSCCTL6) |
+ SBI_SSCCTL_DISABLE);
+
+ /* 20MHz is a corner case which is out of range for the 7-bit divisor */
+ if (crtc->mode.clock == 20000) {
+ auxdiv = 1;
+ divsel = 0x41;
+ phaseinc = 0x20;
+ } else {
+ /* The iCLK virtual clock root frequency is in MHz,
+ * but the crtc->mode.clock in in KHz. To get the divisors,
+ * it is necessary to divide one by another, so we
+ * convert the virtual clock precision to KHz here for higher
+ * precision.
+ */
+ u32 iclk_virtual_root_freq = 172800 * 1000;
+ u32 iclk_pi_range = 64;
+ u32 desired_divisor, msb_divisor_value, pi_value;
+
+ desired_divisor = (iclk_virtual_root_freq / crtc->mode.clock);
+ msb_divisor_value = desired_divisor / iclk_pi_range;
+ pi_value = desired_divisor % iclk_pi_range;
+
+ auxdiv = 0;
+ divsel = msb_divisor_value - 2;
+ phaseinc = pi_value;
+ }
+
+ /* This should not happen with any sane values */
+ WARN_ON(SBI_SSCDIVINTPHASE_DIVSEL(divsel) &
+ ~SBI_SSCDIVINTPHASE_DIVSEL_MASK);
+ WARN_ON(SBI_SSCDIVINTPHASE_DIR(phasedir) &
+ ~SBI_SSCDIVINTPHASE_INCVAL_MASK);
+
+ DRM_DEBUG_KMS("iCLKIP clock: found settings for %dKHz refresh rate: auxdiv=%x, divsel=%x, phasedir=%x, phaseinc=%x\n",
+ crtc->mode.clock,
+ auxdiv,
+ divsel,
+ phasedir,
+ phaseinc);
+
+ /* Program SSCDIVINTPHASE6 */
+ temp = intel_sbi_read(dev_priv, SBI_SSCDIVINTPHASE6);
+ temp &= ~SBI_SSCDIVINTPHASE_DIVSEL_MASK;
+ temp |= SBI_SSCDIVINTPHASE_DIVSEL(divsel);
+ temp &= ~SBI_SSCDIVINTPHASE_INCVAL_MASK;
+ temp |= SBI_SSCDIVINTPHASE_INCVAL(phaseinc);
+ temp |= SBI_SSCDIVINTPHASE_DIR(phasedir);
+ temp |= SBI_SSCDIVINTPHASE_PROPAGATE;
+
+ intel_sbi_write(dev_priv,
+ SBI_SSCDIVINTPHASE6,
+ temp);
+
+ /* Program SSCAUXDIV */
+ temp = intel_sbi_read(dev_priv, SBI_SSCAUXDIV6);
+ temp &= ~SBI_SSCAUXDIV_FINALDIV2SEL(1);
+ temp |= SBI_SSCAUXDIV_FINALDIV2SEL(auxdiv);
+ intel_sbi_write(dev_priv,
+ SBI_SSCAUXDIV6,
+ temp);
+
+
+ /* Enable modulator and associated divider */
+ temp = intel_sbi_read(dev_priv, SBI_SSCCTL6);
+ temp &= ~SBI_SSCCTL_DISABLE;
+ intel_sbi_write(dev_priv,
+ SBI_SSCCTL6,
+ temp);
+
+ /* Wait for initialization time */
+ udelay(24);
+
+ I915_WRITE(PIXCLK_GATE, PIXCLK_GATE_UNGATE);
+}
+
/*
* Enable PCH resources required for PCH ports:
* - PCH PLLs
@@ -2694,11 +2785,14 @@ static void ironlake_pch_enable(struct drm_crtc *crtc)
/* For PCH output, training FDI link */
dev_priv->display.fdi_link_train(crtc);
- intel_enable_pch_pll(intel_crtc);
-
- if (HAS_PCH_CPT(dev)) {
+ if (HAS_PCH_LPT(dev)) {
+ DRM_DEBUG_KMS("LPT detected: programming iCLKIP\n");
+ lpt_program_iclkip(crtc);
+ } else if (HAS_PCH_CPT(dev)) {
u32 sel;
+ intel_enable_pch_pll(intel_crtc);
+
temp = I915_READ(PCH_DPLL_SEL);
switch (pipe) {
default: