@@ -18,6 +18,7 @@
#include "intel_pm.h"
#include "intel_pps.h"
#include "intel_sideband.h"
+#include "intel_snps_phy.h"
#include "intel_tc.h"
#include "intel_vga.h"
@@ -5899,6 +5900,10 @@ static void icl_display_core_init(struct drm_i915_private *dev_priv,
if (DISPLAY_VER(dev_priv) >= 12)
tgl_bw_buddy_init(dev_priv);
+ /* 8. Ensure PHYs have completed calibration and adaptation */
+ if (IS_DG2(dev_priv))
+ intel_snps_phy_wait_for_calibration(dev_priv);
+
if (resume && intel_dmc_has_payload(dev_priv))
intel_dmc_load_program(dev_priv);
@@ -21,6 +21,21 @@
* since it is not handled by the shared DPLL framework as on other platforms.
*/
+void intel_snps_phy_wait_for_calibration(struct drm_i915_private *dev_priv)
+{
+ enum phy phy;
+
+ for_each_phy_masked(phy, ~0) {
+ if (!intel_phy_is_snps(dev_priv, phy))
+ continue;
+
+ if (intel_de_wait_for_clear(dev_priv, ICL_PHY_MISC(phy),
+ DG2_PHY_DP_TX_ACK_MASK, 25))
+ DRM_ERROR("SNPS PHY %c failed to calibrate after 25ms.\n",
+ phy);
+ }
+}
+
static const u32 dg2_ddi_translations[] = {
/* VS 0, pre-emph 0 */
REG_FIELD_PREP(SNPS_PHY_TX_EQ_MAIN, 26),
@@ -8,10 +8,13 @@
#include <linux/types.h>
+struct drm_i915_private;
struct intel_encoder;
struct intel_crtc_state;
struct intel_mpllb_state;
+void intel_snps_phy_wait_for_calibration(struct drm_i915_private *dev_priv);
+
int intel_mpllb_calc_state(struct intel_crtc_state *crtc_state,
struct intel_encoder *encoder);
void intel_mpllb_enable(struct intel_encoder *encoder,
@@ -12442,6 +12442,7 @@ enum skl_power_gate {
_ICL_PHY_MISC_B)
#define ICL_PHY_MISC_MUX_DDID (1 << 28)
#define ICL_PHY_MISC_DE_IO_COMP_PWR_DOWN (1 << 23)
+#define DG2_PHY_DP_TX_ACK_MASK REG_GENMASK(23, 20)
/* Icelake Display Stream Compression Registers */
#define DSCA_PICTURE_PARAMETER_SET_0 _MMIO(0x6B200)
Initialization of the PHY is handled by the hardware/firmware, but the driver should wait up to 25ms for the PHY to report that its calibration has completed. Bspec: 49189 Bspec: 50107 Cc: Matt Atwood <matthew.s.atwood@intel.com> Signed-off-by: Matt Roper <matthew.d.roper@intel.com> --- .../gpu/drm/i915/display/intel_display_power.c | 5 +++++ drivers/gpu/drm/i915/display/intel_snps_phy.c | 15 +++++++++++++++ drivers/gpu/drm/i915/display/intel_snps_phy.h | 3 +++ drivers/gpu/drm/i915/i915_reg.h | 1 + 4 files changed, 24 insertions(+)