[PATCH 3/3] drm/i915/bxt: edp1.4 Intermediate Freq support

Sonika Jindal
2015-05-07T04:31:16Z

BXT supports following intermediate link rates for edp:
2.16GHz, 2.43GHz, 3.24GHz, 4.32GHz.
Adding support for programming the intermediate rates.

Signed-off-by: Sonika Jindal <sonika.jindal@intel.com>
---
drivers/gpu/drm/i915/intel_ddi.c | 44 ++++++++++++++++++++++++++++++++++++--
drivers/gpu/drm/i915/intel_dp.c | 7 +++++-
2 files changed, 48 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_ddi.c b/drivers/gpu/drm/i915/intel_ddi.c
index 9c1e74a..c0cb5f7 100644
--- a/drivers/gpu/drm/i915/intel_ddi.c
+++ b/drivers/gpu/drm/i915/intel_ddi.c
@@ -1397,8 +1397,7 @@ bxt_ddi_pll_select(struct intel_crtc *intel_crtc,
clk_div.lanestagger = 0x04;
else
clk_div.lanestagger = 0x02;
- } else if (intel_encoder->type == INTEL_OUTPUT_DISPLAYPORT ||
- intel_encoder->type == INTEL_OUTPUT_EDP) {
+ } else if (intel_encoder->type == INTEL_OUTPUT_DISPLAYPORT) {
struct drm_encoder *encoder = &intel_encoder->base;
struct intel_dp *intel_dp = enc_to_intel_dp(encoder);

@@ -1416,8 +1415,49 @@ bxt_ddi_pll_select(struct intel_crtc *intel_crtc,
clk_div = bxt_dp_clk_val[0];
DRM_ERROR("Unknown link rate\n");
}
+ } else if (intel_encoder->type == INTEL_OUTPUT_EDP) {
+ struct drm_encoder *encoder = &intel_encoder->base;
+ struct intel_dp *intel_dp = enc_to_intel_dp(encoder);
+ int link_rate;
+
+ /*
+ * If edp1.4 intermediate frequency support is present, we set
+ * link_bw to 0 and a valid rate index in rate_select.
+ */
+ if (intel_dp->link_bw)
+ link_rate = drm_dp_bw_code_to_link_rate(intel_dp->link_bw);
+ else
+ link_rate = intel_dp->sink_rates[intel_dp->rate_select];
+
+ switch (link_rate) {
+ case 162000:
+ clk_div = bxt_dp_clk_val[0];
+ break;
+ case 216000:
+ clk_div = bxt_dp_clk_val[3];
+ break;
+ case 243000:
+ clk_div = bxt_dp_clk_val[4];
+ break;
+ case 270000:
+ clk_div = bxt_dp_clk_val[1];
+ break;
+ case 324000:
+ clk_div = bxt_dp_clk_val[5];
+ break;
+ case 432000:
+ clk_div = bxt_dp_clk_val[6];
+ break;
+ case 540000:
+ clk_div = bxt_dp_clk_val[2];
+ break;
+ default:
+ clk_div = bxt_dp_clk_val[0];
+ DRM_ERROR("Unknown link rate\n");
+ }
}

+
crtc_state->dpll_hw_state.ebb0 =
PORT_PLL_P1(clk_div.p1) | PORT_PLL_P2(clk_div.p2);
crtc_state->dpll_hw_state.pll0 = clk_div.m2_int;
diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index c9d50d1..e6ee7c6 100644
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -85,6 +85,8 @@ static const struct dp_link_dpll chv_dpll[] = {
{ .p1 = 2, .p2 = 1, .n = 1, .m1 = 2, .m2 = 0x6c00000 } }
};

+static const int bxt_rates[] = { 162000, 216000, 243000, 270000,
+ 324000, 432000, 540000 };
static const int skl_rates[] = { 162000, 216000, 270000,
324000, 432000, 540000 };
static const int chv_rates[] = { 162000, 202500, 210000, 216000,
@@ -1161,7 +1163,10 @@ intel_dp_sink_rates(struct intel_dp *intel_dp, const int **sink_rates)
static int
intel_dp_source_rates(struct drm_device *dev, const int **source_rates)
{
- if (IS_SKYLAKE(dev)) {
+ if (IS_BROXTON(dev)) {
+ *source_rates = bxt_rates;
+ return ARRAY_SIZE(bxt_rates);
+ } else if (IS_SKYLAKE(dev)) {
*source_rates = skl_rates;
return ARRAY_SIZE(skl_rates);
} else if (IS_CHERRYVIEW(dev)) {
--
1.7.10.4