From: Ander Conselvan de Oliveira Date: Fri, 28 Apr 2017 08:02:22 +0000 (+0300) Subject: drm/i915/glk: Fix DSI "*ERROR* ULPS is still active" messages X-Git-Tag: MMI-PSA29.97-13-9~5500^2~4^2~11 X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=9b5fed0daa2a9ea3355ef06bb9e87ce800e71df6;p=GitHub%2FMotorolaMobilityLLC%2Fkernel-slsi.git drm/i915/glk: Fix DSI "*ERROR* ULPS is still active" messages The sequence in glk_dsi_device_ready() enters ULPS then waits until it is *not* active to then disable it. The correct sequence according to the spec is to enter ULPS then wait until the GLK_ULPS_NOT_ACTIVE bit is zero, i.e., ULPS is active, and then disable ULPS. Fixing the condition gets rid of the following spurious error messages: [drm:glk_dsi_device_ready [i915]] *ERROR* ULPS is still active Fixes: 4644848369c0 ("drm/i915/glk: Add MIPIIO Enable/disable sequence") Cc: Deepak M Cc: Madhav Chauhan Cc: Jani Nikula Cc: Daniel Vetter Cc: Jani Nikula Cc: intel-gfx@lists.freedesktop.org Cc: Signed-off-by: Ander Conselvan de Oliveira Reviewed-by: Madhav Chauhan Link: http://patchwork.freedesktop.org/patch/msgid/20170428080222.6147-1-ander.conselvan.de.oliveira@intel.com (cherry picked from commit 3acbec03b3c51559d01c879e9564d9c9610fe8ce) Signed-off-by: Jani Nikula --- diff --git a/drivers/gpu/drm/i915/intel_dsi.c b/drivers/gpu/drm/i915/intel_dsi.c index 3ffe8b1f1d48..fc0ef492252a 100644 --- a/drivers/gpu/drm/i915/intel_dsi.c +++ b/drivers/gpu/drm/i915/intel_dsi.c @@ -410,11 +410,10 @@ static void glk_dsi_device_ready(struct intel_encoder *encoder) val |= (ULPS_STATE_ENTER | DEVICE_READY); I915_WRITE(MIPI_DEVICE_READY(port), val); - /* Wait for ULPS Not active */ + /* Wait for ULPS active */ if (intel_wait_for_register(dev_priv, - MIPI_CTRL(port), GLK_ULPS_NOT_ACTIVE, - GLK_ULPS_NOT_ACTIVE, 20)) - DRM_ERROR("ULPS is still active\n"); + MIPI_CTRL(port), GLK_ULPS_NOT_ACTIVE, 0, 20)) + DRM_ERROR("ULPS not active\n"); /* Exit ULPS */ val = I915_READ(MIPI_DEVICE_READY(port));