[Intel-gfx] [PATCH 39/67] drm/i915/cnl: Implement voltage swing sequence.
Manasi Navare
manasi.d.navare at intel.com
Thu May 18 01:13:33 UTC 2017
On Thu, Apr 06, 2017 at 12:15:35PM -0700, Rodrigo Vivi wrote:
> This is an important part of the DDI initalization as well as
> for changing the voltage during DisplayPort link training.
>
> This new sequence for Cannonlake is more like Broxton style
> but still with different registers, different table and
> different steps.
>
> v2: Do not write to DW4_GRP to avoid overwrite individual loadgen.
> Fix PORT_CL_DW5 SUS Clock Config set.
> v3: As previous platforms use only eDP table if low voltage was
> requested.
> v4: fix Werror:maybe uninitialized (Paulo)
> v5: Rebase on top of dw2_swing_sel changes
> on previous patches.
>
> Cc: Ville Syrjälä <ville.syrjala at linux.intel.com>
> Signed-off-by: Rodrigo Vivi <rodrigo.vivi at intel.com>
> ---
> drivers/gpu/drm/i915/i915_reg.h | 1 +
> drivers/gpu/drm/i915/intel_ddi.c | 176 ++++++++++++++++++++++++++++++++++++++-
> drivers/gpu/drm/i915/intel_dp.c | 2 +-
> 3 files changed, 177 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
> index d4f7460..55ffec7 100644
> --- a/drivers/gpu/drm/i915/i915_reg.h
> +++ b/drivers/gpu/drm/i915/i915_reg.h
> @@ -1663,6 +1663,7 @@ enum skl_disp_power_wells {
>
> #define CNL_PORT_CL1CM_DW5 _MMIO(0x162014)
> #define CL_POWER_DOWN_ENABLE (1 << 4)
> +#define SUS_CLOCK_CONFIG (3 << 0)
>
> #define _PORT_CL1CM_DW9_A 0x162024
> #define _PORT_CL1CM_DW9_BC 0x6C024
> diff --git a/drivers/gpu/drm/i915/intel_ddi.c b/drivers/gpu/drm/i915/intel_ddi.c
> index 3c31a22..a4d7061 100644
> --- a/drivers/gpu/drm/i915/intel_ddi.c
> +++ b/drivers/gpu/drm/i915/intel_ddi.c
> @@ -1720,6 +1720,173 @@ u8 intel_ddi_dp_voltage_max(struct intel_encoder *encoder)
> DP_TRAIN_VOLTAGE_SWING_MASK;
> }
>
> +static const struct cnl_ddi_buf_trans *
> +cnl_get_buf_trans_hdmi(struct drm_i915_private *dev_priv,
> + u32 voltage, int *n_entries)
> +{
> + if (voltage == VOLTAGE_INFO_0_85V) {
> + *n_entries = ARRAY_SIZE(cnl_ddi_translations_hdmi_0_85V);
> + return cnl_ddi_translations_hdmi_0_85V;
> + } else if (voltage == VOLTAGE_INFO_0_95V) {
> + *n_entries = ARRAY_SIZE(cnl_ddi_translations_hdmi_0_95V);
> + return cnl_ddi_translations_hdmi_0_95V;
> + } else if (voltage == VOLTAGE_INFO_1_05V) {
> + *n_entries = ARRAY_SIZE(cnl_ddi_translations_hdmi_1_05V);
> + return cnl_ddi_translations_hdmi_1_05V;
> + }
> + return NULL;
> +}
> +
> +static const struct cnl_ddi_buf_trans *
> +cnl_get_buf_trans_dp(struct drm_i915_private *dev_priv,
> + u32 voltage, int *n_entries)
> +{
> + if (voltage == VOLTAGE_INFO_0_85V) {
> + *n_entries = ARRAY_SIZE(cnl_ddi_translations_dp_0_85V);
> + return cnl_ddi_translations_dp_0_85V;
> + } else if (voltage == VOLTAGE_INFO_0_95V) {
> + *n_entries = ARRAY_SIZE(cnl_ddi_translations_dp_0_95V);
> + return cnl_ddi_translations_dp_0_95V;
> + } else if (voltage == VOLTAGE_INFO_1_05V) {
> + *n_entries = ARRAY_SIZE(cnl_ddi_translations_dp_1_05V);
> + return cnl_ddi_translations_dp_1_05V;
> + }
> + return NULL;
> +}
> +
> +static const struct cnl_ddi_buf_trans *
> +cnl_get_buf_trans_edp(struct drm_i915_private *dev_priv,
> + u32 voltage, int *n_entries)
> +{
> + if (dev_priv->vbt.edp.low_vswing) {
> + if (voltage == VOLTAGE_INFO_0_85V) {
> + *n_entries = ARRAY_SIZE(cnl_ddi_translations_edp_0_85V);
> + return cnl_ddi_translations_dp_0_85V;
> + } else if (voltage == VOLTAGE_INFO_0_95V) {
> + *n_entries = ARRAY_SIZE(cnl_ddi_translations_edp_0_95V);
> + return cnl_ddi_translations_edp_0_95V;
> + } else if (voltage == VOLTAGE_INFO_1_05V) {
> + *n_entries = ARRAY_SIZE(cnl_ddi_translations_edp_1_05V);
> + return cnl_ddi_translations_edp_1_05V;
> + }
> + return NULL;
> + } else {
> + return cnl_get_buf_trans_dp(dev_priv, voltage, n_entries);
> + }
> +}
> +
> +static void cnl_ddi_vswing_program(struct drm_i915_private *dev_priv,
> + u32 level, enum port port, int type)
> +{
> + const struct cnl_ddi_buf_trans *ddi_translations = NULL;
> + u32 n_entries, val, voltage;
> + int ln;
> +
> + /*
> + * Values for each port type are listed in
> + * voltage swing programming tables.
> + * Vccio voltage found in PORT_COMP_DW3.
> + */
> + voltage = I915_READ(CNL_PORT_COMP_DW3) & VOLTAGE_INFO_MASK;
> +
> + if (type == INTEL_OUTPUT_HDMI) {
> + ddi_translations = cnl_get_buf_trans_hdmi(dev_priv,
> + voltage, &n_entries);
> + } else if (type == INTEL_OUTPUT_DP) {
> + ddi_translations = cnl_get_buf_trans_dp(dev_priv,
> + voltage, &n_entries);
> + } else if (type == INTEL_OUTPUT_EDP) {
> + ddi_translations = cnl_get_buf_trans_edp(dev_priv,
> + voltage, &n_entries);
> + }
> +
> + if (ddi_translations == NULL) {
> + MISSING_CASE(voltage);
> + return;
> + }
> +
> + if (level >= n_entries) {
> + DRM_DEBUG_KMS("DDI translation not found for level %d. Using %d instead.", level, n_entries - 1);
> + level = n_entries - 1;
> + }
> +
> + /* Set PORT_TX_DW5 Scaling Mode Sel to 010b. */
> + val = I915_READ(CNL_PORT_TX_DW5_LN0(port));
> + val |= SCALING_MODE_SEL;
Make the change based on new macro for SCALING_MODE_SEL
So it will be val |= SCALING_MODE_SEL(0x2);
Manasi
> + I915_WRITE(CNL_PORT_TX_DW5_GRP(port), val);
> +
> + /* Program PORT_TX_DW2 */
> + val = I915_READ(CNL_PORT_TX_DW2_LN0(port));
> + val |= SWING_SEL_UPPER(ddi_translations[level].dw2_swing_sel);
> + val |= SWING_SEL_LOWER(ddi_translations[level].dw2_swing_sel);
> + /* Rcomp scalar is fixed as 0x98 for every table entry */
> + val |= RCOMP_SCALAR(0x98);
> + I915_WRITE(CNL_PORT_TX_DW2_GRP(port), val);
> +
> + /* Program PORT_TX_DW4 */
> + /* We cannot write to GRP. It would overrite individual loadgen */
> + for (ln = 0; ln < 4; ln++) {
> + val = I915_READ(CNL_PORT_TX_DW4_LN(port, ln));
> + val |= POST_CURSOR_1(ddi_translations[level].dw4_post_cursor_1);
> + val |= POST_CURSOR_2(ddi_translations[level].dw4_post_cursor_2);
> + val |= CURSOR_COEFF(ddi_translations[level].dw4_cursor_coeff);
> + I915_WRITE(CNL_PORT_TX_DW4_LN(port, ln), val);
> + }
> +
> + /* Program PORT_TX_DW5 */
> + /* All DW5 values are fixed for every table entry */
> + val = I915_READ(CNL_PORT_TX_DW5_LN0(port));
> + val |= RTERM_SELECT(6);
> + val |= TAP3_DISABLE;
> + I915_WRITE(CNL_PORT_TX_DW5_GRP(port), val);
> +
> + /* Program PORT_TX_DW7 */
> + val = I915_READ(CNL_PORT_TX_DW7_LN0(port));
> + val |= N_SCALAR(ddi_translations[level].dw7_n_scalar);
> + I915_WRITE(CNL_PORT_TX_DW7_GRP(port), val);
> +}
> +
> +static void cnl_ddi_vswing_sequence(struct drm_i915_private *dev_priv,
> + u32 level, enum port port, int type)
> +{
> + u32 val;
> +
> + /*
> + * 1. If port type is eDP or DP,
> + * set PORT_PCS_DW1 cmnkeeper_enable to 1b,
> + * else clear to 0b.
> + */
> + val = I915_READ(CNL_PORT_PCS_DW1_LN0(port));
> + if (type == INTEL_OUTPUT_EDP || type == INTEL_OUTPUT_DP)
> + val |= COMMON_KEEPER_EN;
> + else
> + val &= ~COMMON_KEEPER_EN;
> + I915_WRITE(CNL_PORT_PCS_DW1_GRP(port), val);
> +
> + /* 2. Program loadgen select */
> + /*
> + * FIXME: Program PORT_TX_DW4_LN depending on Bit rate and used lanes
> + */
> +
> + /* 3. Set PORT_CL_DW5 SUS Clock Config to 11b */
> + val = I915_READ(CNL_PORT_CL1CM_DW5);
> + val |= SUS_CLOCK_CONFIG;
> + I915_WRITE(CNL_PORT_CL1CM_DW5, val);
> +
> + /* 4. Clear training enable to change swing values */
> + val = I915_READ(CNL_PORT_TX_DW5_LN0(port));
> + val &= ~TX_TRAINING_EN;
> + I915_WRITE(CNL_PORT_TX_DW5_GRP(port), val);
> +
> + /* 5. Program swing and de-emphasis */
> + cnl_ddi_vswing_program(dev_priv, level, port, type);
> +
> + /* 6. Set training enable to trigger update */
> + val = I915_READ(CNL_PORT_TX_DW5_LN0(port));
> + val |= TX_TRAINING_EN;
> + I915_WRITE(CNL_PORT_TX_DW5_GRP(port), val);
> +}
> +
> static uint32_t translate_signal_level(int signal_levels)
> {
> int i;
> @@ -1752,7 +1919,11 @@ uint32_t ddi_signal_levels(struct intel_dp *intel_dp)
> skl_ddi_set_iboost(encoder, level);
> else if (IS_GEN9_LP(dev_priv))
> bxt_ddi_vswing_sequence(dev_priv, level, port, encoder->type);
> -
> + else if (IS_CANNONLAKE(dev_priv)) {
> + cnl_ddi_vswing_sequence(dev_priv, level, port, encoder->type);
> + /* DDI_BUF_CTL bits 27:24 are reserved on CNL */
> + return 0;
> + }
> return DDI_BUF_TRANS_SELECT(level);
> }
>
> @@ -1850,6 +2021,9 @@ static void intel_ddi_pre_enable_hdmi(struct intel_encoder *encoder,
> else if (IS_GEN9_LP(dev_priv))
> bxt_ddi_vswing_sequence(dev_priv, level, port,
> INTEL_OUTPUT_HDMI);
> + else if (IS_CANNONLAKE(dev_priv))
> + cnl_ddi_vswing_sequence(dev_priv, level, port,
> + INTEL_OUTPUT_HDMI);
>
> intel_hdmi->set_infoframes(drm_encoder,
> has_hdmi_sink,
> diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
> index da111cb..b7adf0a 100644
> --- a/drivers/gpu/drm/i915/intel_dp.c
> +++ b/drivers/gpu/drm/i915/intel_dp.c
> @@ -3471,7 +3471,7 @@ static uint32_t chv_signal_levels(struct intel_dp *intel_dp)
> if (HAS_DDI(dev_priv)) {
> signal_levels = ddi_signal_levels(intel_dp);
>
> - if (IS_GEN9_LP(dev_priv))
> + if (IS_GEN9_LP(dev_priv) || IS_CANNONLAKE(dev_priv))
> signal_levels = 0;
> else
> mask = DDI_BUF_EMP_MASK;
> --
> 1.9.1
>
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