From 8e9ecb3e1e3366559cd4ed5ab698c391f8236a37 Mon Sep 17 00:00:00 2001 From: Chris Wilson Date: Tue, 2 Jul 2019 15:09:50 +0100 Subject: [PATCH] drm/i915/display: Handle lost primary_port across suspend icl-dsi is dying on suspend/resume at RIP: 0010:icl_update_active_dpll+0x2c/0xa0 [i915] which appears due to the loss of the time primary_port across suspend. Protect against the potential NULL dereference by assuming ICL_PORT_DPLL_DEFAULT unless the port is actively specified otherwise. Fixes: 24a7bfe0c2d7 ("drm/i915: Keep the TypeC port mode fixed when the port is active") Signed-off-by: Chris Wilson Reviewed-by: Imre Deak Link: https://patchwork.freedesktop.org/patch/msgid/20190702140950.7069-1-chris@chris-wilson.co.uk --- drivers/gpu/drm/i915/display/intel_dpll_mgr.c | 13 ++++--------- 1 file changed, 4 insertions(+), 9 deletions(-) diff --git a/drivers/gpu/drm/i915/display/intel_dpll_mgr.c b/drivers/gpu/drm/i915/display/intel_dpll_mgr.c index 76a2c879efc2..f953971e7c3b 100644 --- a/drivers/gpu/drm/i915/display/intel_dpll_mgr.c +++ b/drivers/gpu/drm/i915/display/intel_dpll_mgr.c @@ -2883,21 +2883,16 @@ static void icl_update_active_dpll(struct intel_atomic_state *state, struct intel_crtc_state *crtc_state = intel_atomic_get_new_crtc_state(state, crtc); struct intel_digital_port *primary_port; - enum icl_port_dpll_id port_dpll_id; + enum icl_port_dpll_id port_dpll_id = ICL_PORT_DPLL_DEFAULT; primary_port = encoder->type == INTEL_OUTPUT_DP_MST ? enc_to_mst(&encoder->base)->primary : enc_to_dig_port(&encoder->base); - switch (primary_port->tc_mode) { - case TC_PORT_TBT_ALT: - port_dpll_id = ICL_PORT_DPLL_DEFAULT; - break; - case TC_PORT_DP_ALT: - case TC_PORT_LEGACY: + if (primary_port && + (primary_port->tc_mode == TC_PORT_DP_ALT || + primary_port->tc_mode == TC_PORT_LEGACY)) port_dpll_id = ICL_PORT_DPLL_MG_PHY; - break; - } icl_set_active_port_dpll(crtc_state, port_dpll_id); } -- 2.30.2