From bc458c1174e3124c10897fcc1b8b54fbc2db474e Mon Sep 17 00:00:00 2001 From: Imre Deak Date: Tue, 6 Nov 2018 18:06:20 +0200 Subject: [PATCH] drm/i915/icl: Skip init for an already enabled combo PHY MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit Bspec says we should skip the initialization of combo PHYs that are already initialized. We'll need to reinit the PHYs more frequently when exiting from DC6 (after the next patch), so let's make sure the uninit sequence complies with the spec. For safety skip the init only if all the PHY register fields have their expected values. v2: - Print 'Port X' as we do elsewhere instead of 'Port-X'. (Jose) Bspec: 21257 Cc: Paulo Zanoni Cc: Ville Syrjälä Cc: José Roberto de Souza Cc: Rodrigo Vivi Signed-off-by: Imre Deak Reviewed-by: Rodrigo Vivi Reviewed-by: José Roberto de Souza Link: https://patchwork.freedesktop.org/patch/msgid/20181106160621.23057-5-imre.deak@intel.com --- drivers/gpu/drm/i915/intel_combo_phy.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/drivers/gpu/drm/i915/intel_combo_phy.c b/drivers/gpu/drm/i915/intel_combo_phy.c index de3c4954a773..f7c16f6724f0 100644 --- a/drivers/gpu/drm/i915/intel_combo_phy.c +++ b/drivers/gpu/drm/i915/intel_combo_phy.c @@ -202,6 +202,12 @@ void icl_combo_phys_init(struct drm_i915_private *dev_priv) for (port = PORT_A; port <= PORT_B; port++) { u32 val; + if (icl_combo_phy_verify_state(dev_priv, port)) { + DRM_DEBUG_DRIVER("Port %c combo PHY already enabled, won't reprogram it.\n", + port_name(port)); + continue; + } + val = I915_READ(ICL_PHY_MISC(port)); val &= ~ICL_PHY_MISC_DE_IO_COMP_PWR_DOWN; I915_WRITE(ICL_PHY_MISC(port), val); -- 2.45.2