[Intel-gfx] [PATCH 7/9] drm/i915/dp: Enable upfront link training on SKL
Manasi Navare
manasi.d.navare at intel.com
Fri Aug 19 23:33:47 UTC 2016
From: Jim Bride <jim.bride at linux.intel.com>
Split the PLL selection code out of the BXT upfront link training
implementation and into a stand-alone function in order to allow
for the implementation of a platform neutral upfront link training
function, and then enable upfront link training for Skylake.
Signed-off-by: Jim Bride <jim.bride at linux.intel.com>
---
drivers/gpu/drm/i915/intel_ddi.c | 56 ++++++++++++++++++++++++-----------
drivers/gpu/drm/i915/intel_dp.c | 4 +--
drivers/gpu/drm/i915/intel_dpll_mgr.c | 38 ++++++++++++++++++++++++
drivers/gpu/drm/i915/intel_dpll_mgr.h | 2 ++
drivers/gpu/drm/i915/intel_drv.h | 4 ++-
5 files changed, 84 insertions(+), 20 deletions(-)
diff --git a/drivers/gpu/drm/i915/intel_ddi.c b/drivers/gpu/drm/i915/intel_ddi.c
index 3921230..ef63b4b 100644
--- a/drivers/gpu/drm/i915/intel_ddi.c
+++ b/drivers/gpu/drm/i915/intel_ddi.c
@@ -2378,8 +2378,43 @@ intel_ddi_init_hdmi_connector(struct intel_digital_port *intel_dig_port)
return connector;
}
+struct intel_shared_dpll *
+intel_ddi_get_link_dpll(struct intel_dp *intel_dp, int clock)
+{
+ struct intel_connector *connector = intel_dp->attached_connector;
+ struct intel_encoder *encoder = connector->encoder;
+ struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
+ struct intel_digital_port *dig_port = dp_to_dig_port(intel_dp);
+ struct intel_shared_dpll *pll = NULL;
+ struct intel_shared_dpll_config tmp_pll_config;
+ enum intel_dpll_id dpll_id;
+
+ if (IS_BROXTON(dev_priv)) {
+ dpll_id = (enum intel_dpll_id)dig_port->port;
+ /*
+ * Select the required PLL. This works for platforms where
+ * there is no shared DPLL.
+ */
+ pll = &dev_priv->shared_dplls[dpll_id];
+ if (WARN_ON(pll->active_mask)) {
+
+ DRM_ERROR("Shared DPLL in use. active_mask:%x\n",
+ pll->active_mask);
+ pll = NULL;
+ }
+ tmp_pll_config = pll->config;
+ if (!bxt_ddi_dp_set_dpll_hw_state(clock,
+ &pll->config.hw_state)) {
+ DRM_ERROR("Could not setup DPLL\n");
+ pll->config = tmp_pll_config;
+ }
+ } else if (IS_SKYLAKE(dev_priv)) {
+ pll = skl_find_link_pll(dev_priv, clock);
+ }
+ return pll;
+}
-bool intel_bxt_upfront_link_train(struct intel_dp *intel_dp,
+bool intel_ddi_upfront_link_train(struct intel_dp *intel_dp,
int clock, uint8_t lane_count,
bool link_mst)
{
@@ -2388,28 +2423,15 @@ bool intel_bxt_upfront_link_train(struct intel_dp *intel_dp,
struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
struct intel_shared_dpll *pll;
struct intel_shared_dpll_config tmp_pll_config;
- struct intel_digital_port *dig_port = dp_to_dig_port(intel_dp);
- enum intel_dpll_id dpll_id = (enum intel_dpll_id)dig_port->port;
- /*
- * FIXME: Works only for BXT.
- * Select the required PLL. This works for platforms where
- * there is no shared DPLL.
- */
- pll = &dev_priv->shared_dplls[dpll_id];
- if (WARN_ON(pll->active_mask)) {
- DRM_ERROR("Shared DPLL already in use. active_mask:%x\n", pll->active_mask);
+ pll = intel_ddi_get_link_dpll(intel_dp, clock);
+ if (pll == NULL) {
+ DRM_ERROR("Could not find DPLL for link training.\n");
return false;
}
tmp_pll_config = pll->config;
- if (!bxt_ddi_dp_set_dpll_hw_state(clock, &pll->config.hw_state)) {
- DRM_ERROR("Could not setup DPLL\n");
- pll->config = tmp_pll_config;
- return false;
- }
-
/* Enable PLL followed by port */
pll->funcs.enable(dev_priv, pll);
intel_ddi_pre_enable_dp(encoder, clock, lane_count, pll, link_mst);
diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index 5e362eb..fe156fb 100644
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -5757,8 +5757,8 @@ intel_dp_init_connector(struct intel_digital_port *intel_dig_port,
/* Initialize upfront link training vfunc for DP */
if (intel_encoder->type != INTEL_OUTPUT_EDP) {
- if (IS_BROXTON(dev))
- intel_dp->upfront_link_train = intel_bxt_upfront_link_train;
+ if (IS_BROXTON(dev) || IS_SKYLAKE(dev))
+ intel_dp->upfront_link_train = intel_ddi_upfront_link_train;
}
/* eDP only on port B and/or C on vlv/chv */
diff --git a/drivers/gpu/drm/i915/intel_dpll_mgr.c b/drivers/gpu/drm/i915/intel_dpll_mgr.c
index 8ce220e..e5c025e 100644
--- a/drivers/gpu/drm/i915/intel_dpll_mgr.c
+++ b/drivers/gpu/drm/i915/intel_dpll_mgr.c
@@ -24,6 +24,44 @@
#include "intel_drv.h"
struct intel_shared_dpll *
+skl_find_link_pll(struct drm_i915_private *dev_priv, int clock)
+{
+ struct intel_shared_dpll *pll = NULL;
+ struct intel_dpll_hw_state dpll_hw_state;
+ enum intel_dpll_id i;
+ bool found = false;
+
+ if (!skl_ddi_dp_set_dpll_hw_state(clock, &dpll_hw_state))
+ return pll;
+
+ for (i = DPLL_ID_SKL_DPLL1; i <= DPLL_ID_SKL_DPLL3; i++) {
+ pll = &dev_priv->shared_dplls[i];
+
+ /* Only want to check enabled timings first */
+ if (pll->config.crtc_mask == 0)
+ continue;
+
+ if (memcmp(&dpll_hw_state, &pll->config.hw_state,
+ sizeof(pll->config.hw_state)) == 0) {
+ found = true;
+ break;
+ }
+ }
+
+ /* Ok no matching timings, maybe there's a free one? */
+ for (i = DPLL_ID_SKL_DPLL1;
+ ((found == false) && (i <= DPLL_ID_SKL_DPLL3)); i++) {
+ pll = &dev_priv->shared_dplls[i];
+ if (pll->config.crtc_mask == 0) {
+ pll->config.hw_state = dpll_hw_state;
+ break;
+ }
+ }
+
+ return pll;
+}
+
+struct intel_shared_dpll *
intel_get_shared_dpll_by_id(struct drm_i915_private *dev_priv,
enum intel_dpll_id id)
{
diff --git a/drivers/gpu/drm/i915/intel_dpll_mgr.h b/drivers/gpu/drm/i915/intel_dpll_mgr.h
index cb28f8d..ec0fe66 100644
--- a/drivers/gpu/drm/i915/intel_dpll_mgr.h
+++ b/drivers/gpu/drm/i915/intel_dpll_mgr.h
@@ -167,5 +167,7 @@ bool bxt_ddi_dp_set_dpll_hw_state(int clock,
/* SKL dpll related functions */
bool skl_ddi_dp_set_dpll_hw_state(int clock,
struct intel_dpll_hw_state *dpll_hw_state);
+struct intel_shared_dpll *skl_find_link_pll(struct drm_i915_private *dev_priv,
+ int clock);
#endif /* _INTEL_DPLL_MGR_H_ */
diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
index 8b3d062..374cbbd 100644
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -1158,9 +1158,11 @@ void intel_ddi_clock_get(struct intel_encoder *encoder,
struct intel_crtc_state *pipe_config);
void intel_ddi_set_vc_payload_alloc(struct drm_crtc *crtc, bool state);
uint32_t ddi_signal_levels(struct intel_dp *intel_dp);
-bool intel_bxt_upfront_link_train(struct intel_dp *intel_dp,
+bool intel_ddi_upfront_link_train(struct intel_dp *intel_dp,
int clock, uint8_t lane_count,
bool link_mst);
+struct intel_shared_dpll *intel_ddi_get_link_dpll(struct intel_dp *intel_dp,
+ int clock);
unsigned int intel_fb_align_height(struct drm_device *dev,
unsigned int height,
--
1.9.1
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