[PATCH v2 01/23] drm/i915/icl: Add support to read out the TBT PLL HW state

Imre Deak
2019-06-20T14:06:06Z

Add support to read out the TBT PLL HW state.

Cc: Vandita Kulkarni <vandita.kulkarni@intel.com>
Cc: Paulo Zanoni <paulo.r.zanoni@intel.com>
Cc: Lucas De Marchi <lucas.demarchi@intel.com>
Signed-off-by: Imre Deak <imre.deak@intel.com>
Reviewed-by: José Roberto de Souza <jose.souza@intel.com>
---
drivers/gpu/drm/i915/display/intel_display.c | 11 +++++++++--
1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_display.c b/drivers/gpu/drm/i915/display/intel_display.c
index 8592a7d422de..62a7a88b1c2e 100644
--- a/drivers/gpu/drm/i915/display/intel_display.c
+++ b/drivers/gpu/drm/i915/display/intel_display.c
@@ -9939,13 +9939,20 @@ static void icelake_get_ddi_pll(struct drm_i915_private *dev_priv,
enum intel_dpll_id id;
u32 temp;

- /* TODO: TBT pll not implemented. */
if (intel_port_is_combophy(dev_priv, port)) {
temp = I915_READ(DPCLKA_CFGCR0_ICL) &
DPCLKA_CFGCR0_DDI_CLK_SEL_MASK(port);
id = temp >> DPCLKA_CFGCR0_DDI_CLK_SEL_SHIFT(port);
} else if (intel_port_is_tc(dev_priv, port)) {
- id = icl_tc_port_to_pll_id(intel_port_to_tc(dev_priv, port));
+ u32 clk_sel = I915_READ(DDI_CLK_SEL(port)) & DDI_CLK_SEL_MASK;
+
+ if (clk_sel == DDI_CLK_SEL_MG) {
+ id = icl_tc_port_to_pll_id(intel_port_to_tc(dev_priv,
+ port));
+ } else {
+ WARN_ON(clk_sel < DDI_CLK_SEL_TBT_162);
+ id = DPLL_ID_ICL_TBTPLL;
+ }
} else {
WARN(1, "Invalid port %x\n", port);
return;