PLLs are the source clocks for the DDIs so in order
to determine the ddi clock we need to check the PLL
configuration.
v2: Mika pointed out that 24 was hardcoded while it
should consider ref clock that can be either 24KHz
or 19.2KHz on CNL.
Reviewed-by: Mika Kahola <mika.kahola@xxxxxxxxx>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@xxxxxxxxx>
---
drivers/gpu/drm/i915/i915_reg.h | 2 +
drivers/gpu/drm/i915/intel_ddi.c | 111 +++++++++++++++++++++++++++++++++++++++
2 files changed, 113 insertions(+)
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 55ffec7..51ffbee 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -8329,6 +8329,7 @@ enum {
#define DPLL_CFGCR0_LINK_RATE_3240 (6 << 25)
#define DPLL_CFGCR0_LINK_RATE_4050 (7 << 25)
#define DPLL_CFGCR0_DCO_FRACTION_MASK (0x7fff << 10)
+#define DPLL_CFGCR0_DCO_FRAC_SHIFT (10)
#define DPLL_CFGCR0_DCO_FRACTION(x) ((x) << 10)
#define DPLL_CFGCR0_DCO_INTEGER_MASK (0x3ff)
#define CNL_DPLL_CFGCR0(pll) _MMIO_PLL(pll, _CNL_DPLL0_CFGCR0, _CNL_DPLL1_CFGCR0)
@@ -8336,6 +8337,7 @@ enum {
#define _CNL_DPLL0_CFGCR1 0x6C004
#define _CNL_DPLL1_CFGCR1 0x6C084
#define DPLL_CFGCR1_QDIV_RATIO_MASK (0xff << 10)
+#define DPLL_CFGCR1_QDIV_RATIO_SHIFT (10)
#define DPLL_CFGCR1_QDIV_RATIO(x) ((x) << 10)
#define DPLL_CFGCR1_QDIV_MODE(x) ((x) << 9)
#define DPLL_CFGCR1_KDIV_MASK (7 << 6)
diff --git a/drivers/gpu/drm/i915/intel_ddi.c b/drivers/gpu/drm/i915/intel_ddi.c
index 3f461c3..dd804c0 100644
--- a/drivers/gpu/drm/i915/intel_ddi.c
+++ b/drivers/gpu/drm/i915/intel_ddi.c
@@ -1102,6 +1102,62 @@ static int skl_calc_wrpll_link(struct drm_i915_private *dev_priv,
return dco_freq / (p0 * p1 * p2 * 5);
}
+static int cnl_calc_wrpll_link(struct drm_i915_private *dev_priv,
+ uint32_t pll_id)
+{
+ uint32_t cfgcr0, cfgcr1;
+ uint32_t p0, p1, p2, dco_freq, ref_clock;
+
+ cfgcr0 = I915_READ(CNL_DPLL_CFGCR0(pll_id));
+ cfgcr1 = I915_READ(CNL_DPLL_CFGCR1(pll_id));
+
+ p0 = cfgcr1 & DPLL_CFGCR1_PDIV_MASK;
+ p2 = cfgcr1 & DPLL_CFGCR1_KDIV_MASK;
+
+ if (cfgcr1 & DPLL_CFGCR1_QDIV_MODE(1))
+ p1 = (cfgcr1 & DPLL_CFGCR1_QDIV_RATIO_MASK) >>
+ DPLL_CFGCR1_QDIV_RATIO_SHIFT;
+ else
+ p1 = 1;
+
+
+ switch (p0) {
+ case DPLL_CFGCR1_PDIV_2:
+ p0 = 2;
+ break;
+ case DPLL_CFGCR1_PDIV_3:
+ p0 = 3;
+ break;
+ case DPLL_CFGCR1_PDIV_5:
+ p0 = 5;
+ break;
+ case DPLL_CFGCR1_PDIV_7:
+ p0 = 7;
+ break;
+ }
+
+ switch (p2) {
+ case DPLL_CFGCR1_KDIV_1:
+ p2 = 1;
+ break;
+ case DPLL_CFGCR1_KDIV_2:
+ p2 = 2;
+ break;
+ case DPLL_CFGCR1_KDIV_4:
+ p2 = 4;
+ break;
+ }
+
+ ref_clock = dev_priv->cdclk.hw.ref;
+
+ dco_freq = (cfgcr0 & DPLL_CFGCR0_DCO_INTEGER_MASK) * ref_clock;
+
+ dco_freq += (((cfgcr0 & DPLL_CFGCR0_DCO_FRACTION_MASK) >>
+ DPLL_CFGCR0_DCO_FRAC_SHIFT) * ref_clock) / 0x8000;
+
+ return dco_freq / (p0 * p1 * p2 * 5);
+}
+
static void ddi_dotclock_get(struct intel_crtc_state *pipe_config)
{
int dotclock;
@@ -1123,6 +1179,59 @@ static void ddi_dotclock_get(struct intel_crtc_state *pipe_config)
pipe_config->base.adjusted_mode.crtc_clock = dotclock;
}
+static void cnl_ddi_clock_get(struct intel_encoder *encoder,
+ struct intel_crtc_state *pipe_config)
+{
+ struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
+ int link_clock = 0;
+ uint32_t cfgcr0, pll_id;
+
+ pll_id = intel_get_shared_dpll_id(dev_priv, pipe_config->shared_dpll);
+
+ cfgcr0 = I915_READ(CNL_DPLL_CFGCR0(pll_id));
+
+ if (cfgcr0 & DPLL_CFGCR0_HDMI_MODE) {
+ link_clock = cnl_calc_wrpll_link(dev_priv, pll_id);
+ } else {
+ link_clock = cfgcr0 & DPLL_CFGCR0_LINK_RATE_MASK;
+
+ switch (link_clock) {
+ case DPLL_CFGCR0_LINK_RATE_810:
+ link_clock = 81000;
+ break;
+ case DPLL_CFGCR0_LINK_RATE_1080:
+ link_clock = 108000;
+ break;
+ case DPLL_CFGCR0_LINK_RATE_1350:
+ link_clock = 135000;
+ break;
+ case DPLL_CFGCR0_LINK_RATE_1620:
+ link_clock = 162000;
+ break;
+ case DPLL_CFGCR0_LINK_RATE_2160:
+ link_clock = 216000;
+ break;
+ case DPLL_CFGCR0_LINK_RATE_2700:
+ link_clock = 270000;
+ break;
+ case DPLL_CFGCR0_LINK_RATE_3240:
+ link_clock = 324000;
+ break;
+ case DPLL_CFGCR0_LINK_RATE_4050:
+ link_clock = 405000;
+ break;
+ default:
+ WARN(1, "Unsupported link rate\n");
+ break;
+ }
+ link_clock *= 2;
+ }
+
+ pipe_config->port_clock = link_clock;
+
+ ddi_dotclock_get(pipe_config);
+}
+
static void skl_ddi_clock_get(struct intel_encoder *encoder,
struct intel_crtc_state *pipe_config)
{
@@ -1266,6 +1375,8 @@ void intel_ddi_clock_get(struct intel_encoder *encoder,
skl_ddi_clock_get(encoder, pipe_config);
else if (IS_GEN9_LP(dev_priv))
bxt_ddi_clock_get(encoder, pipe_config);
+ else if (IS_CANNONLAKE(dev_priv))
+ cnl_ddi_clock_get(encoder, pipe_config);
}
void intel_ddi_set_pipe_settings(const struct intel_crtc_state *crtc_state)
--
1.9.1
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