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drm/i915/lt_phy: Add check if PLL is enabled

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Add check for PLL enabling and return early if
PLL is not enabled.

v2: Use PCLK PLL ACK bit to check if PLL is enabled (Suraj)
v3: Check only if PCLK PLL ACK bit for lane 0 is enabled (Suraj)

Signed-off-by: Mika Kahola <mika.kahola@intel.com>
Reviewed-by: Suraj Kandpal <suraj.kandpal@intel.com>
Link: https://patch.msgid.link/20260312080657.2648265-3-mika.kahola@intel.com
This commit is contained in:
Mika Kahola 2026-03-12 08:06:35 +00:00
parent 3df7e2feb8
commit 78ca669ca5
1 changed files with 11 additions and 0 deletions
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11
drivers/gpu/drm/i915/display/intel_lt_phy.c
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@ -2176,6 +2176,14 @@ intel_lt_phy_pll_compare_hw_state(const struct intel_lt_phy_pll_state *a,
return false;
}
static bool intel_lt_phy_pll_is_enabled(struct intel_encoder *encoder)
{
struct intel_display *display = to_intel_display(encoder);
return intel_de_read(display, XELPDP_PORT_CLOCK_CTL(display, encoder->port)) &
XELPDP_LANE_PCLK_PLL_ACK(0);
}
void intel_lt_phy_pll_readout_hw_state(struct intel_encoder *encoder,
const struct intel_crtc_state *crtc_state,
struct intel_lt_phy_pll_state *pll_state)
@ -2185,6 +2193,9 @@ void intel_lt_phy_pll_readout_hw_state(struct intel_encoder *encoder,
struct ref_tracker *wakeref;
int i, j, k;
if (!intel_lt_phy_pll_is_enabled(encoder))
return;
pll_state->tbt_mode = intel_tc_port_in_tbt_alt_mode(enc_to_dig_port(encoder));
if (pll_state->tbt_mode)
return;