[Intel-gfx] [PATCH 19/20] drm/i915/dp: program VSwing and Preemphasis control settings on VLV
Daniel Vetter
daniel at ffwll.ch
Tue Mar 19 20:30:18 CET 2013
On Fri, Mar 08, 2013 at 10:46:02AM -0800, Jesse Barnes wrote:
> From: Pallavi G <pallavi.g at intel.com>
>
> Program few Tx buffer Swing control settings through DPIO.
>
> Signed-off-by: Pallavi G <pallavi.g at intel.com>
> Signed-off-by: Yogesh M <yogesh.mohan.marimuthu at intel.com>
> Signed-off-by: Gajanan Bhat <gajanan.bhat at intel.com>
Two comments below.
> ---
> drivers/gpu/drm/i915/intel_display.c | 3 +-
> drivers/gpu/drm/i915/intel_dp.c | 114 +++++++++++++++++++++++++++++++++-
> drivers/gpu/drm/i915/intel_drv.h | 2 +
> 3 files changed, 115 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
> index 5e338c6..3b085bb 100644
> --- a/drivers/gpu/drm/i915/intel_display.c
> +++ b/drivers/gpu/drm/i915/intel_display.c
> @@ -451,8 +451,7 @@ u32 intel_dpio_read(struct drm_i915_private *dev_priv, int reg)
> return I915_READ(DPIO_DATA);
> }
>
> -static void intel_dpio_write(struct drm_i915_private *dev_priv, int reg,
> - u32 val)
> +void intel_dpio_write(struct drm_i915_private *dev_priv, int reg, u32 val)
> {
> WARN_ON(!mutex_is_locked(&dev_priv->dpio_lock));
>
> diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
> index 6a2c606..b2dbd31 100644
> --- a/drivers/gpu/drm/i915/intel_dp.c
> +++ b/drivers/gpu/drm/i915/intel_dp.c
> @@ -1527,7 +1527,9 @@ intel_dp_voltage_max(struct intel_dp *intel_dp)
> {
> struct drm_device *dev = intel_dp_to_dev(intel_dp);
>
> - if (IS_GEN7(dev) && is_cpu_edp(intel_dp))
> + if (IS_VALLEYVIEW(dev))
> + return DP_TRAIN_VOLTAGE_SWING_1200;
> + else if (IS_GEN7(dev) && is_cpu_edp(intel_dp))
> return DP_TRAIN_VOLTAGE_SWING_800;
> else if (HAS_PCH_CPT(dev) && !is_cpu_edp(intel_dp))
> return DP_TRAIN_VOLTAGE_SWING_1200;
> @@ -1552,7 +1554,19 @@ intel_dp_pre_emphasis_max(struct intel_dp *intel_dp, uint8_t voltage_swing)
> default:
> return DP_TRAIN_PRE_EMPHASIS_0;
> }
> - } else if (IS_GEN7(dev) && is_cpu_edp(intel_dp) && !IS_VALLEYVIEW(dev)) {
> + } else if (IS_VALLEYVIEW(dev)) {
> + switch (voltage_swing & DP_TRAIN_VOLTAGE_SWING_MASK) {
> + case DP_TRAIN_VOLTAGE_SWING_400:
> + return DP_TRAIN_PRE_EMPHASIS_9_5;
> + case DP_TRAIN_VOLTAGE_SWING_600:
> + return DP_TRAIN_PRE_EMPHASIS_6;
> + case DP_TRAIN_VOLTAGE_SWING_800:
> + return DP_TRAIN_PRE_EMPHASIS_3_5;
> + case DP_TRAIN_VOLTAGE_SWING_1200:
> + default:
> + return DP_TRAIN_PRE_EMPHASIS_0;
> + }
> + } else if (IS_GEN7(dev) && is_cpu_edp(intel_dp)) {
> switch (voltage_swing & DP_TRAIN_VOLTAGE_SWING_MASK) {
> case DP_TRAIN_VOLTAGE_SWING_400:
> return DP_TRAIN_PRE_EMPHASIS_6;
> @@ -1577,15 +1591,111 @@ intel_dp_pre_emphasis_max(struct intel_dp *intel_dp, uint8_t voltage_swing)
> }
> }
>
> +static void vlv_set_vswing_pre_emphasis(struct intel_dp *intel_dp, uint8_t v,
> + uint8_t p)
> +{
> + struct drm_device *dev = intel_dp_to_dev(intel_dp);
> + struct drm_i915_private *dev_priv = dev->dev_private;
> + unsigned long Demph_reg_value, Preemph_reg_value,
> + Uniqtranscale_reg_value;
CodingStyle doesn't like uppercase in variables.
> + switch (p) {
> + case DP_TRAIN_PRE_EMPHASIS_0:
> + Preemph_reg_value = 0x0004000;
> + switch (v) {
> + case DP_TRAIN_VOLTAGE_SWING_400:
> + Demph_reg_value = 0x2B405555;
> + Uniqtranscale_reg_value = 0x552AB83A;
> + break;
> + case DP_TRAIN_VOLTAGE_SWING_600:
> + Demph_reg_value = 0x2B404040;
> + Uniqtranscale_reg_value = 0x5548B83A;
> + break;
> + case DP_TRAIN_VOLTAGE_SWING_800:
> + Demph_reg_value = 0x2B245555;
> + Uniqtranscale_reg_value = 0x5560B83A;
> + break;
> + case DP_TRAIN_VOLTAGE_SWING_1200:
> + Demph_reg_value = 0x2B405555;
> + Uniqtranscale_reg_value = 0x5598DA3A;
> + break;
> + default:
> + return;
> + }
> + break;
> + case DP_TRAIN_PRE_EMPHASIS_3_5:
> + Preemph_reg_value = 0x0002000;
> + switch (v) {
> + case DP_TRAIN_VOLTAGE_SWING_400:
> + Demph_reg_value = 0x2B404040;
> + Uniqtranscale_reg_value = 0x5552B83A;
> + break;
> + case DP_TRAIN_VOLTAGE_SWING_600:
> + Demph_reg_value = 0x2B404848;
> + Uniqtranscale_reg_value = 0x5580B83A;
> + break;
> + case DP_TRAIN_VOLTAGE_SWING_800:
> + Demph_reg_value = 0x2B404040;
> + Uniqtranscale_reg_value = 0x55ADDA3A;
> + break;
> + default:
> + return;
> + }
> + break;
> + case DP_TRAIN_PRE_EMPHASIS_6:
> + Preemph_reg_value = 0x0000000;
> + switch (v) {
> + case DP_TRAIN_VOLTAGE_SWING_400:
> + Demph_reg_value = 0x2B305555;
> + Uniqtranscale_reg_value = 0x5570B83A;
> + break;
> + case DP_TRAIN_VOLTAGE_SWING_600:
> + Demph_reg_value = 0x2B2B4040;
> + Uniqtranscale_reg_value = 0x55ADDA3A;
> + break;
> + default:
> + return;
> + }
> + break;
> + case DP_TRAIN_PRE_EMPHASIS_9_5:
> + Preemph_reg_value = 0x0006000;
> + switch (v) {
> + case DP_TRAIN_VOLTAGE_SWING_400:
> + Demph_reg_value = 0x1B405555;
> + Uniqtranscale_reg_value = 0x55ADDA3A;
> + break;
> + default:
> + return;
> + }
> + break;
> + default:
> + return;
> + }
> +
> + /* eDP is only on port C */
> + mutex_lock(&dev_priv->dpio_lock);
> + intel_dpio_write(dev_priv, 0x8494, 0x00000000);
> + intel_dpio_write(dev_priv, 0x8490, Demph_reg_value);
> + intel_dpio_write(dev_priv, 0x8488, Uniqtranscale_reg_value);
> + intel_dpio_write(dev_priv, 0x848c, 0x0C782040);
> + intel_dpio_write(dev_priv, 0x842c, 0x00030000);
> + intel_dpio_write(dev_priv, 0x8424, Preemph_reg_value);
> + intel_dpio_write(dev_priv, 0x8494, 0x80000000);
> + mutex_unlock(&dev_priv->dpio_lock);
> +}
> +
> static void
> intel_get_adjust_train(struct intel_dp *intel_dp, uint8_t link_status[DP_LINK_STATUS_SIZE])
> {
> + struct drm_device *dev = intel_dp_to_dev(intel_dp);
> uint8_t v = 0;
> uint8_t p = 0;
> int lane;
> uint8_t voltage_max;
> uint8_t preemph_max;
>
> + if (IS_VALLEYVIEW(dev))
> + vlv_set_vswing_pre_emphasis(intel_dp, v, p);
This call should be moved to intel_dp_set_signal_levels I think. Bspec has
similar registers for some special voltage/pre-emph settings on other
platforms, so we might need to add other code like that.
-Daniel
> +
> for (lane = 0; lane < intel_dp->lane_count; lane++) {
> uint8_t this_v = drm_dp_get_adjust_request_voltage(link_status, lane);
> uint8_t this_p = drm_dp_get_adjust_request_pre_emphasis(link_status, lane);
> diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
> index 494037d..03fdfbd 100644
> --- a/drivers/gpu/drm/i915/intel_drv.h
> +++ b/drivers/gpu/drm/i915/intel_drv.h
> @@ -661,6 +661,8 @@ extern int intel_sprite_get_colorkey(struct drm_device *dev, void *data,
> struct drm_file *file_priv);
>
> extern u32 intel_dpio_read(struct drm_i915_private *dev_priv, int reg);
> +extern void intel_dpio_write(struct drm_i915_private *dev_priv, int reg,
> + u32 val);
>
> /* Power-related functions, located in intel_pm.c */
> extern void intel_init_pm(struct drm_device *dev);
> --
> 1.7.10.4
>
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--
Daniel Vetter
Software Engineer, Intel Corporation
+41 (0) 79 365 57 48 - http://blog.ffwll.ch
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