From: Ville Syrjälä Date: Fri, 10 Apr 2015 15:21:31 +0000 (+0300) Subject: drm/i915: Only wait for required lanes in vlv_wait_port_ready() X-Git-Tag: omap-for-v4.2/fixes-rc1^2~17^2~54^2~1 X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=9b6de0a1552175620ced3a7a7a552d4e7a379538;p=pandora-kernel.git drm/i915: Only wait for required lanes in vlv_wait_port_ready() Currently vlv_wait_port_ready() waits for all four lanes on the appropriate channel. This no longer works on CHV when the unused lanes may be power gated. So pass in a mask of lanes that the caller is expecting to be ready. Signed-off-by: Ville Syrjälä Reviewed-by: Deepak S Signed-off-by: Daniel Vetter --- diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c index fd228a27a7d0..22e6644f755e 100644 --- a/drivers/gpu/drm/i915/intel_display.c +++ b/drivers/gpu/drm/i915/intel_display.c @@ -1844,7 +1844,8 @@ static void chv_disable_pll(struct drm_i915_private *dev_priv, enum pipe pipe) } void vlv_wait_port_ready(struct drm_i915_private *dev_priv, - struct intel_digital_port *dport) + struct intel_digital_port *dport, + unsigned int expected_mask) { u32 port_mask; int dpll_reg; @@ -1857,6 +1858,7 @@ void vlv_wait_port_ready(struct drm_i915_private *dev_priv, case PORT_C: port_mask = DPLL_PORTC_READY_MASK; dpll_reg = DPLL(0); + expected_mask <<= 4; break; case PORT_D: port_mask = DPLL_PORTD_READY_MASK; @@ -1866,9 +1868,9 @@ void vlv_wait_port_ready(struct drm_i915_private *dev_priv, BUG(); } - if (wait_for((I915_READ(dpll_reg) & port_mask) == 0, 1000)) - WARN(1, "timed out waiting for port %c ready: 0x%08x\n", - port_name(dport->port), I915_READ(dpll_reg)); + if (wait_for((I915_READ(dpll_reg) & port_mask) == expected_mask, 1000)) + WARN(1, "timed out waiting for port %c ready: got 0x%x, expected 0x%x\n", + port_name(dport->port), I915_READ(dpll_reg) & port_mask, expected_mask); } static void intel_prepare_shared_dpll(struct intel_crtc *crtc) Reading git-diff-tree failed