[Intel-gfx] [PATCH 2/2] drm/i915/glk: Enable cold boot for GLK DSI
Madhav Chauhan
madhav.chauhan at intel.com
Tue May 9 13:29:25 UTC 2017
As per BSEPC, if device ready bit is '0' in enable IO sequence
then its a cold boot/reset scenario eg: S3/S4 resume. In these
conditions we need to program certain registers and prepare port
from the middle of DSI enable sequence otherwise feature like S3/S4
doesn't work.
Signed-off-by: Madhav Chauhan <madhav.chauhan at intel.com>
---
drivers/gpu/drm/i915/intel_dsi.c | 79 ++++++++++++++++++++++++----------------
1 file changed, 48 insertions(+), 31 deletions(-)
diff --git a/drivers/gpu/drm/i915/intel_dsi.c b/drivers/gpu/drm/i915/intel_dsi.c
index fc0ef49..6b68864 100644
--- a/drivers/gpu/drm/i915/intel_dsi.c
+++ b/drivers/gpu/drm/i915/intel_dsi.c
@@ -346,12 +346,17 @@ static bool intel_dsi_compute_config(struct intel_encoder *encoder,
return true;
}
-static void glk_dsi_device_ready(struct intel_encoder *encoder)
+static void intel_dsi_prepare(struct intel_encoder *intel_encoder,
+ struct intel_crtc_state *pipe_config);
+
+static void glk_dsi_device_ready(struct intel_encoder *encoder,
+ struct intel_crtc_state *pipe_config)
{
struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
struct intel_dsi *intel_dsi = enc_to_intel_dsi(&encoder->base);
enum port port;
u32 tmp, val;
+ bool cold_boot = false;
/* Set the MIPI mode
* If MIPI_Mode is off, then writing to LP_Wake bit is not reflecting.
@@ -370,7 +375,10 @@ static void glk_dsi_device_ready(struct intel_encoder *encoder)
/* Program LP Wake */
for_each_dsi_port(port, intel_dsi->ports) {
tmp = I915_READ(MIPI_CTRL(port));
- tmp |= GLK_LP_WAKE;
+ if (!(I915_READ(MIPI_DEVICE_READY(port)) & DEVICE_READY))
+ tmp &= ~GLK_LP_WAKE;
+ else
+ tmp |= GLK_LP_WAKE;
I915_WRITE(MIPI_CTRL(port), tmp);
}
@@ -382,6 +390,15 @@ static void glk_dsi_device_ready(struct intel_encoder *encoder)
DRM_ERROR("MIPIO port is powergated\n");
}
+ /* Check if cold boot scenario */
+ for_each_dsi_port(port, intel_dsi->ports) {
+ cold_boot |= !(I915_READ(MIPI_DEVICE_READY(port)) &
+ DEVICE_READY);
+ }
+
+ if (cold_boot)
+ intel_dsi_prepare(encoder, pipe_config);
+
/* Wait for MIPI PHY status bit to set */
for_each_dsi_port(port, intel_dsi->ports) {
if (intel_wait_for_register(dev_priv,
@@ -402,34 +419,34 @@ static void glk_dsi_device_ready(struct intel_encoder *encoder)
val |= DEVICE_READY;
I915_WRITE(MIPI_DEVICE_READY(port), val);
usleep_range(10, 15);
- }
-
- /* 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);
+ } else {
+ /* 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);
- /* Wait for ULPS active */
- if (intel_wait_for_register(dev_priv,
+ /* Wait for ULPS active */
+ if (intel_wait_for_register(dev_priv,
MIPI_CTRL(port), GLK_ULPS_NOT_ACTIVE, 0, 20))
- DRM_ERROR("ULPS not active\n");
+ DRM_ERROR("ULPS not active\n");
- /* 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);
+ /* 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);
- /* Enter Normal Mode */
- val = I915_READ(MIPI_DEVICE_READY(port));
- val &= ~ULPS_STATE_MASK;
- val |= (ULPS_STATE_NORMAL_OPERATION | DEVICE_READY);
- I915_WRITE(MIPI_DEVICE_READY(port), val);
+ /* Enter Normal Mode */
+ val = I915_READ(MIPI_DEVICE_READY(port));
+ val &= ~ULPS_STATE_MASK;
+ val |= (ULPS_STATE_NORMAL_OPERATION | DEVICE_READY);
+ I915_WRITE(MIPI_DEVICE_READY(port), val);
- tmp = I915_READ(MIPI_CTRL(port));
- tmp &= ~GLK_LP_WAKE;
- I915_WRITE(MIPI_CTRL(port), tmp);
+ tmp = I915_READ(MIPI_CTRL(port));
+ tmp &= ~GLK_LP_WAKE;
+ I915_WRITE(MIPI_CTRL(port), tmp);
+ }
}
/* Wait for Stop state */
@@ -515,7 +532,8 @@ static void vlv_dsi_device_ready(struct intel_encoder *encoder)
}
}
-static void intel_dsi_device_ready(struct intel_encoder *encoder)
+static void intel_dsi_device_ready(struct intel_encoder *encoder,
+ struct intel_crtc_state *pipe_config)
{
struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
@@ -524,7 +542,7 @@ static void intel_dsi_device_ready(struct intel_encoder *encoder)
else if (IS_BROXTON(dev_priv))
bxt_dsi_device_ready(encoder);
else if (IS_GEMINILAKE(dev_priv))
- glk_dsi_device_ready(encoder);
+ glk_dsi_device_ready(encoder, pipe_config);
}
static void glk_dsi_enter_low_power_mode(struct intel_encoder *encoder)
@@ -710,8 +728,6 @@ static void intel_dsi_port_disable(struct intel_encoder *encoder)
}
}
-static void intel_dsi_prepare(struct intel_encoder *intel_encoder,
- struct intel_crtc_state *pipe_config);
static void intel_dsi_unprepare(struct intel_encoder *encoder);
static void intel_dsi_msleep(struct intel_dsi *intel_dsi, int msec)
@@ -800,7 +816,8 @@ static void intel_dsi_pre_enable(struct intel_encoder *encoder,
I915_WRITE(DSPCLK_GATE_D, val);
}
- intel_dsi_prepare(encoder, pipe_config);
+ if (!IS_GEMINILAKE(dev_priv))
+ intel_dsi_prepare(encoder, pipe_config);
/* Power on, try both CRC pmic gpio and VBT */
if (intel_dsi->gpio_panel)
@@ -812,7 +829,7 @@ static void intel_dsi_pre_enable(struct intel_encoder *encoder,
intel_dsi_vbt_exec_sequence(intel_dsi, MIPI_SEQ_DEASSERT_RESET);
/* Put device in ready state (LP-11) */
- intel_dsi_device_ready(encoder);
+ intel_dsi_device_ready(encoder, pipe_config);
/* Send initialization commands in LP mode */
intel_dsi_vbt_exec_sequence(intel_dsi, MIPI_SEQ_INIT_OTP);
--
1.9.1
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