AuxXxilium/linux_dsm_epyc7002
1
0
Fork 0
mirror of https://github.com/AuxXxilium/linux_dsm_epyc7002.git synced 2024-12-09 16:56:44 +07:00
Code Issues Actions Packages Projects Releases Wiki Activity

drm/i915/bxt: Fix BXT DSI ULPS sequence

Browse Source 
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:
Uma Shankar 2017-02-08 16:20:54 +05:30 committed by Jani Nikula
parent 6043801f93
commit eba4daf0dc
1 changed files with 5 additions and 18 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

23
drivers/gpu/drm/i915/intel_dsi.c
View File

@ -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);
}