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drm/i915/cnl: Add allowed DP rates for Cannonlake.

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"Frequencies over 5.4 GHz only supported on certain
DDI ports and SKUs, and requires Vccio >= 0.95V."

More specifically, for current CNL SKUs available
(CNL-U and CNL-Y) we have:

DDI A - 5.4G eDP
DDI B - 8.1G DP
DDI C - 8.1G DP
DDI D - 5.4G DP

v2: Rebase on top of source_rates changes.
v3: Address the max 5.4 x 8.1 per DDI and also consider vccio.

Cc: Mika Kahola <mika.kahola@intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Reviewed-by: Manasi Navare <manasi.d.navare@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20170810224008.15571-1-rodrigo.vivi@intel.com
This commit is contained in:
Rodrigo Vivi 2017-08-10 15:40:08 -07:00
parent 50946c8985
commit d907b6658a
1 changed files with 12 additions and 0 deletions
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12
drivers/gpu/drm/i915/intel_dp.c
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@ -97,6 +97,9 @@ 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 cnl_rates[] = { 162000, 216000, 270000,
324000, 432000, 540000,
648000, 810000 };
static const int default_rates[] = { 162000, 270000, 540000 };
/**
@ -229,8 +232,10 @@ intel_dp_set_source_rates(struct intel_dp *intel_dp)
{
struct intel_digital_port *dig_port = dp_to_dig_port(intel_dp);
struct drm_i915_private *dev_priv = to_i915(dig_port->base.base.dev);
enum port port = dig_port->port;
const int *source_rates;
int size;
u32 voltage;
/* This should only be done once */
WARN_ON(intel_dp->source_rates || intel_dp->num_source_rates);
@ -238,6 +243,13 @@ intel_dp_set_source_rates(struct intel_dp *intel_dp)
if (IS_GEN9_LP(dev_priv)) {
source_rates = bxt_rates;
size = ARRAY_SIZE(bxt_rates);
} else if (IS_CANNONLAKE(dev_priv)) {
source_rates = cnl_rates;
size = ARRAY_SIZE(cnl_rates);
voltage = I915_READ(CNL_PORT_COMP_DW3) & VOLTAGE_INFO_MASK;
if (port == PORT_A || port == PORT_D ||
voltage == VOLTAGE_INFO_0_85V)
size -= 2;
} else if (IS_GEN9_BC(dev_priv)) {
source_rates = skl_rates;
size = ARRAY_SIZE(skl_rates);