From: Jim Bride <jim.br...@linux.intel.com>
Add the PLL selection code for HSW/BDW/BXT/SKL into a stand-alone function
in order to allow for the implementation of a platform neutral upfront
link training function.
v4:
* Removed dereferencing NULL pointer in case of failure (Dhinakaran Pandiyan)
v3:
* Add Hooks for all DDI platforms into this standalone function
v2:
* Change the macro to use dev_priv instead of dev (David Weinehall)
Reviewed-by: Durgadoss R <durgados...@intel.com>
Signed-off-by: Manasi Navare <manasi.d.nav...@intel.com>
Signed-off-by: Jim Bride <jim.br...@linux.intel.com>
---
drivers/gpu/drm/i915/intel_ddi.c | 39 +++++++++++++++++++++++++++++++++++
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 | 3 ++-
4 files changed, 81 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/i915/intel_ddi.c b/drivers/gpu/drm/i915/intel_ddi.c
index e4b875e..25e7973 100644
--- a/drivers/gpu/drm/i915/intel_ddi.c
+++ b/drivers/gpu/drm/i915/intel_ddi.c
@@ -2393,6 +2393,45 @@ 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);
+ return 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;
+ return NULL;
+ }
+ } else if (IS_SKYLAKE(dev_priv)) {
+ pll = skl_find_link_pll(dev_priv, clock);
+ } else if (IS_HASWELL(dev_priv) || IS_BROADWELL(dev_priv)) {
+ pll = hsw_ddi_dp_get_dpll(encoder, clock);
+ }
+ return pll;
+}
+
void intel_ddi_init(struct drm_device *dev, enum port port)
{
struct drm_i915_private *dev_priv = to_i915(dev);
diff --git a/drivers/gpu/drm/i915/intel_dpll_mgr.c
b/drivers/gpu/drm/i915/intel_dpll_mgr.c
index 9a1da98..4b067ac 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 aed7408..f438535 100644
--- a/drivers/gpu/drm/i915/intel_dpll_mgr.h
+++ b/drivers/gpu/drm/i915/intel_dpll_mgr.h
@@ -168,6 +168,8 @@ 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);
/* HSW dpll related functions */
diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
index 7868d5c..996c804 100644
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -1159,7 +1159,8 @@ 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);
-
+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,
uint32_t pixel_format,
--
1.9.1
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