From edba48fdfc4770ee41d71e2c2c0360b15cca6567 Mon Sep 17 00:00:00 2001 From: =?utf8?q?Ville=20Syrj=C3=A4l=C3=A4?= Date: Mon, 16 Oct 2017 17:57:03 +0300 Subject: [PATCH] drm/i915: Centralize the SKL DDI A/E vs. B/C/D buf trans handling MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit SKL DDI B/C/D only have 9 usable buf trans registers for DP/eDP. That matches the normal DP buf trans tables, but the low vswing eDP tables have 10 entries. Thus the eDP tables can only be used safely with DDI A and E. We try to catch cases where DDI B/C/D gets used with the wrong number of entires in some parts of the code, but not everywhere. Let's move the code to deal with that deeper into intel_ddi_get_buf_trans_edp(). And for sake of symmetry do the same in intel_ddi_get_buf_trans_dp(). That would also avoid explosions in the rather unlikely case that the DP tables would get revised to 10 entries as well. Signed-off-by: Ville Syrjälä Link: https://patchwork.freedesktop.org/patch/msgid/20171016145705.11780-9-ville.syrjala@linux.intel.com Reviewed-by: James Ausmus --- drivers/gpu/drm/i915/intel_ddi.c | 60 +++++++++++++++++++++++----------------- 1 file changed, 34 insertions(+), 26 deletions(-) diff --git a/drivers/gpu/drm/i915/intel_ddi.c b/drivers/gpu/drm/i915/intel_ddi.c index 96ceb7a..5ee0e33 100644 --- a/drivers/gpu/drm/i915/intel_ddi.c +++ b/drivers/gpu/drm/i915/intel_ddi.c @@ -587,14 +587,29 @@ skl_get_buf_trans_hdmi(struct drm_i915_private *dev_priv, int *n_entries) } } +static int skl_buf_trans_num_entries(enum port port, int n_entries) +{ + /* Only DDIA and DDIE can select the 10th register with DP */ + if (port == PORT_A || port == PORT_E) + return min(n_entries, 10); + else + return min(n_entries, 9); +} + static const struct ddi_buf_trans * intel_ddi_get_buf_trans_dp(struct drm_i915_private *dev_priv, - int *n_entries) + enum port port, int *n_entries) { if (IS_KABYLAKE(dev_priv) || IS_COFFEELAKE(dev_priv)) { - return kbl_get_buf_trans_dp(dev_priv, n_entries); + const struct ddi_buf_trans *ddi_translations = + kbl_get_buf_trans_dp(dev_priv, n_entries); + *n_entries = skl_buf_trans_num_entries(port, *n_entries); + return ddi_translations; } else if (IS_SKYLAKE(dev_priv)) { - return skl_get_buf_trans_dp(dev_priv, n_entries); + const struct ddi_buf_trans *ddi_translations = + skl_get_buf_trans_dp(dev_priv, n_entries); + *n_entries = skl_buf_trans_num_entries(port, *n_entries); + return ddi_translations; } else if (IS_BROADWELL(dev_priv)) { *n_entries = ARRAY_SIZE(bdw_ddi_translations_dp); return bdw_ddi_translations_dp; @@ -609,10 +624,13 @@ intel_ddi_get_buf_trans_dp(struct drm_i915_private *dev_priv, static const struct ddi_buf_trans * intel_ddi_get_buf_trans_edp(struct drm_i915_private *dev_priv, - int *n_entries) + enum port port, int *n_entries) { if (IS_GEN9_BC(dev_priv)) { - return skl_get_buf_trans_edp(dev_priv, n_entries); + const struct ddi_buf_trans *ddi_translations = + skl_get_buf_trans_edp(dev_priv, n_entries); + *n_entries = skl_buf_trans_num_entries(port, *n_entries); + return ddi_translations; } else if (IS_BROADWELL(dev_priv)) { return bdw_get_buf_trans_edp(dev_priv, n_entries); } else if (IS_HASWELL(dev_priv)) { @@ -801,11 +819,11 @@ static void intel_prepare_dp_ddi_buffers(struct intel_encoder *encoder) switch (encoder->type) { case INTEL_OUTPUT_EDP: - ddi_translations = intel_ddi_get_buf_trans_edp(dev_priv, + ddi_translations = intel_ddi_get_buf_trans_edp(dev_priv, port, &n_entries); break; case INTEL_OUTPUT_DP: - ddi_translations = intel_ddi_get_buf_trans_dp(dev_priv, + ddi_translations = intel_ddi_get_buf_trans_dp(dev_priv, port, &n_entries); break; case INTEL_OUTPUT_ANALOG: @@ -817,16 +835,10 @@ static void intel_prepare_dp_ddi_buffers(struct intel_encoder *encoder) return; } - if (IS_GEN9_BC(dev_priv)) { - /* If we're boosting the current, set bit 31 of trans1 */ - if (dev_priv->vbt.ddi_port_info[port].dp_boost_level) - iboost_bit = DDI_BUF_BALANCE_LEG_ENABLE; - - if (WARN_ON(encoder->type == INTEL_OUTPUT_EDP && - port != PORT_A && port != PORT_E && - n_entries > 9)) - n_entries = 9; - } + /* If we're boosting the current, set bit 31 of trans1 */ + if (IS_GEN9_BC(dev_priv) && + dev_priv->vbt.ddi_port_info[port].dp_boost_level) + iboost_bit = DDI_BUF_BALANCE_LEG_ENABLE; for (i = 0; i < n_entries; i++) { I915_WRITE(DDI_BUF_TRANS_LO(port, i), @@ -1831,14 +1843,9 @@ static void skl_ddi_set_iboost(struct intel_encoder *encoder, if (type == INTEL_OUTPUT_HDMI) ddi_translations = intel_ddi_get_buf_trans_hdmi(dev_priv, &n_entries); else if (type == INTEL_OUTPUT_EDP) - ddi_translations = intel_ddi_get_buf_trans_edp(dev_priv, &n_entries); + ddi_translations = intel_ddi_get_buf_trans_edp(dev_priv, port, &n_entries); else - ddi_translations = intel_ddi_get_buf_trans_dp(dev_priv, &n_entries); - - if (WARN_ON(type != INTEL_OUTPUT_HDMI && - port != PORT_A && - port != PORT_E && n_entries > 9)) - n_entries = 9; + ddi_translations = intel_ddi_get_buf_trans_dp(dev_priv, port, &n_entries); iboost = ddi_translations[level].i_boost; } @@ -1880,6 +1887,7 @@ static void bxt_ddi_vswing_sequence(struct intel_encoder *encoder, u8 intel_ddi_dp_voltage_max(struct intel_encoder *encoder) { struct drm_i915_private *dev_priv = to_i915(encoder->base.dev); + enum port port = encoder->port; int n_entries; if (IS_CANNONLAKE(dev_priv)) { @@ -1894,9 +1902,9 @@ u8 intel_ddi_dp_voltage_max(struct intel_encoder *encoder) bxt_get_buf_trans_dp(dev_priv, &n_entries); } else { if (encoder->type == INTEL_OUTPUT_EDP) - intel_ddi_get_buf_trans_edp(dev_priv, &n_entries); + intel_ddi_get_buf_trans_edp(dev_priv, port, &n_entries); else - intel_ddi_get_buf_trans_dp(dev_priv, &n_entries); + intel_ddi_get_buf_trans_dp(dev_priv, port, &n_entries); } if (WARN_ON(n_entries < 1)) -- 2.7.4