Commit b3aa6769 authored by Suraj Kandpal's avatar Suraj Kandpal
Browse files

drm/i915/ltphy: Provide protection against unsupported modes 



We need to make sure we return some port clock in case we have
unsupported LT PHY modes or if we were not able to read the LT PHY state
for whatever reason and the mode ends up being 0.

Signed-off-by: default avatarSuraj Kandpal <suraj.kandpal@intel.com>
Reviewed-by: default avatarAnkit Nautiyal <ankit.k.nautiyal@intel.com>
Link: https://patch.msgid.link/20260105055937.136522-3-suraj.kandpal@intel.com
parent 73b506e6

drivers/gpu/drm/i915/display/intel_lt_phy.c

+6 −1
Original line number Diff line number Diff line
@@ -31,6 +31,7 @@ 
#define INTEL_LT_PHY_BOTH_LANES		(INTEL_LT_PHY_LANE1 |\

					 INTEL_LT_PHY_LANE0)

#define MODE_DP				3

#define MODE_HDMI_20			4

#define Q32_TO_INT(x)	((x) >> 32)

#define Q32_TO_FRAC(x)	((x) & 0xFFFFFFFF)

#define DCO_MIN_FREQ_MHZ	11850
@@ -1751,6 +1752,7 @@ int 
intel_lt_phy_calc_port_clock(struct intel_encoder *encoder,

			     const struct intel_crtc_state *crtc_state)

{

	struct intel_display *display = to_intel_display(encoder);

	int clk;

	const struct intel_lt_phy_pll_state *lt_state =

		&crtc_state->dpll_hw_state.ltpll;
@@ -1768,8 +1770,11 @@ intel_lt_phy_calc_port_clock(struct intel_encoder *encoder, 
		rate = REG_FIELD_GET8(LT_PHY_VDR_RATE_ENCODING_MASK,

				      lt_state->config[0]);

		clk = intel_lt_phy_get_dp_clock(rate);

	} else {

	} else if (mode == MODE_HDMI_20) {

		clk = intel_lt_phy_calc_hdmi_port_clock(crtc_state);

	} else {

		drm_WARN_ON(display->drm, "Unsupported LT PHY Mode!\n");

		clk = xe3plpd_lt_hdmi_252.clock;

	}



	return clk;