From eba4daf0dc5861703000f58b1d51110ced2b2fb5 Mon Sep 17 00:00:00 2001 From: Uma Shankar Date: Wed, 8 Feb 2017 16:20:54 +0530 Subject: [PATCH] drm/i915/bxt: Fix BXT DSI ULPS sequence Fix the Sequence to program BXT DSI Latch and ULPS. Signed-off-by: Uma Shankar Signed-off-by: Vidya Srinivas Reviewed-by: Bob Paauwe Signed-off-by: Jani Nikula Link: http://patchwork.freedesktop.org/patch/msgid/1486551058-22596-6-git-send-email-vidya.srinivas@intel.com --- drivers/gpu/drm/i915/intel_dsi.c | 23 +++++------------------ 1 file changed, 5 insertions(+), 18 deletions(-) diff --git a/drivers/gpu/drm/i915/intel_dsi.c b/drivers/gpu/drm/i915/intel_dsi.c index 99dd7e12abc0..e7e823d00444 100644 --- a/drivers/gpu/drm/i915/intel_dsi.c +++ b/drivers/gpu/drm/i915/intel_dsi.c @@ -366,32 +366,19 @@ static void bxt_dsi_device_ready(struct intel_encoder *encoder) DRM_DEBUG_KMS("\n"); - /* Exit Low power state in 4 steps*/ + /* Enable MIPI PHY transparent latch */ for_each_dsi_port(port, intel_dsi->ports) { - - /* 1. Enable MIPI PHY transparent latch */ val = I915_READ(BXT_MIPI_PORT_CTRL(port)); I915_WRITE(BXT_MIPI_PORT_CTRL(port), val | LP_OUTPUT_HOLD); usleep_range(2000, 2500); + } - /* 2. Enter ULPS */ - val = I915_READ(MIPI_DEVICE_READY(port)); - val &= ~ULPS_STATE_MASK; - val |= (ULPS_STATE_ENTER | DEVICE_READY); - I915_WRITE(MIPI_DEVICE_READY(port), val); - /* at least 2us - relaxed for hrtimer subsystem optimization */ - usleep_range(10, 50); - - /* 3. Exit ULPS */ + /* Clear ULPS and set device ready */ + for_each_dsi_port(port, intel_dsi->ports) { val = I915_READ(MIPI_DEVICE_READY(port)); val &= ~ULPS_STATE_MASK; - val |= (ULPS_STATE_EXIT | DEVICE_READY); I915_WRITE(MIPI_DEVICE_READY(port), val); - usleep_range(1000, 1500); - - /* Clear ULPS and set device ready */ - val = I915_READ(MIPI_DEVICE_READY(port)); - val &= ~ULPS_STATE_MASK; + usleep_range(2000, 2500); val |= DEVICE_READY; I915_WRITE(MIPI_DEVICE_READY(port), val); } -- 2.20.1