mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-07 15:56:40 +07:00
drm/i915/bxt: Fix BXT DSI ULPS sequence
Fix the Sequence to program BXT DSI Latch and ULPS. Signed-off-by: Uma Shankar <uma.shankar@intel.com> Signed-off-by: Vidya Srinivas <vidya.srinivas@intel.com> Reviewed-by: Bob Paauwe <bob.j.paauwe@intel.com> Signed-off-by: Jani Nikula <jani.nikula@intel.com> Link: http://patchwork.freedesktop.org/patch/msgid/1486551058-22596-6-git-send-email-vidya.srinivas@intel.com
This commit is contained in:
parent
6043801f93
commit
eba4daf0dc
@ -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 */
|
||||
/* 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_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 */
|
||||
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);
|
||||
}
|
||||
|
Loading…
Reference in New Issue
Block a user