Commit eba4daf0 authored by Uma Shankar's avatar Uma Shankar Committed by Jani Nikula

drm/i915/bxt: Fix BXT DSI ULPS sequence

Fix the Sequence to program BXT DSI Latch and ULPS.
Signed-off-by: default avatarUma Shankar <uma.shankar@intel.com>
Signed-off-by: default avatarVidya Srinivas <vidya.srinivas@intel.com>
Reviewed-by: default avatarBob Paauwe <bob.j.paauwe@intel.com>
Signed-off-by: default avatarJani Nikula <jani.nikula@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1486551058-22596-6-git-send-email-vidya.srinivas@intel.com
parent 6043801f
......@@ -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 */
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 */
for_each_dsi_port(port, intel_dsi->ports) {
val = I915_READ(MIPI_DEVICE_READY(port));
val &= ~ULPS_STATE_MASK;
I915_WRITE(MIPI_DEVICE_READY(port), val);
usleep_range(2000, 2500);
val |= DEVICE_READY;
I915_WRITE(MIPI_DEVICE_READY(port), val);
}
......
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