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

Sonika Jindal
2015-05-26T09:31:06Z

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

v2: Adding clock in bxt_clk_div struct and then look for the entry with
required rate (Ville)
v3: 'clock' has the selected value, no need to use link_bw or rate_select
for selecting pll(Ville)
v4: Make bxt_dp_clk_val const and remove size (Ville)
v5: Rebased

Signed-off-by: Sonika Jindal <sonika.jindal@intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
---
drivers/gpu/drm/i915/intel_ddi.c | 40 +++++++++++++++-----------------------
drivers/gpu/drm/i915/intel_dp.c | 7 ++++++-
2 files changed, 22 insertions(+), 25 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_ddi.c b/drivers/gpu/drm/i915/intel_ddi.c
index cacb07b..eb3238a 100644
--- a/drivers/gpu/drm/i915/intel_ddi.c
+++ b/drivers/gpu/drm/i915/intel_ddi.c
@@ -1334,6 +1334,7 @@ skl_ddi_pll_select(struct intel_crtc *intel_crtc,

/* bxt clock parameters */
struct bxt_clk_div {
+ int clock;
uint32_t p1;
uint32_t p2;
uint32_t m2_int;
@@ -1343,14 +1344,14 @@ struct bxt_clk_div {
};

/* pre-calculated values for DP linkrates */
-static struct bxt_clk_div bxt_dp_clk_val[7] = {
- /* 162 */ {4, 2, 32, 1677722, 1, 1},
- /* 270 */ {4, 1, 27, 0, 0, 1},
- /* 540 */ {2, 1, 27, 0, 0, 1},
- /* 216 */ {3, 2, 32, 1677722, 1, 1},
- /* 243 */ {4, 1, 24, 1258291, 1, 1},
- /* 324 */ {4, 1, 32, 1677722, 1, 1},
- /* 432 */ {3, 1, 32, 1677722, 1, 1}
+static const struct bxt_clk_div bxt_dp_clk_val[] = {
+ {162000, 4, 2, 32, 1677722, 1, 1, 5, 11, 2, 9, 0xd},
+ {270000, 4, 1, 27, 0, 0, 1, 3, 8, 1, 9, 0xd},
+ {540000, 2, 1, 27, 0, 0, 1, 3, 8, 1, 9, 0x18},
+ {216000, 3, 2, 32, 1677722, 1, 1, 5, 11, 2, 9, 0xd},
+ {243000, 4, 1, 24, 1258291, 1, 1, 5, 11, 2, 9, 0xd},
+ {324000, 4, 1, 32, 1677722, 1, 1, 5, 11, 2, 9, 0xd},
+ {432000, 3, 1, 32, 1677722, 1, 1, 5, 11, 2, 9, 0x18}
};

static bool
@@ -1390,24 +1391,15 @@ bxt_ddi_pll_select(struct intel_crtc *intel_crtc,
vco = best_clock.vco;
} else if (intel_encoder->type == INTEL_OUTPUT_DISPLAYPORT ||
intel_encoder->type == INTEL_OUTPUT_EDP) {
- struct drm_encoder *encoder = &intel_encoder->base;
- struct intel_dp *intel_dp = enc_to_intel_dp(encoder);
+ int i;

- switch (intel_dp->link_bw) {
- case DP_LINK_BW_1_62:
- clk_div = bxt_dp_clk_val[0];
- break;
- case DP_LINK_BW_2_7:
- clk_div = bxt_dp_clk_val[1];
- break;
- case DP_LINK_BW_5_4:
- clk_div = bxt_dp_clk_val[2];
- break;
- default:
- clk_div = bxt_dp_clk_val[0];
- DRM_ERROR("Unknown link rate\n");
+ clk_div = bxt_dp_clk_val[0];
+ for (i = 0; i < ARRAY_SIZE(bxt_dp_clk_val); ++i) {
+ if (bxt_dp_clk_val[i].clock == clock) {
+ clk_div = bxt_dp_clk_val[i];
+ break;
+ }
}
- vco = clock * 10 / 2 * clk_div.p1 * clk_div.p2;
}

dco_amp = 15;
diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index abd442a..bd0f958 100644
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -91,6 +91,8 @@ 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,
@@ -1170,7 +1172,10 @@ 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