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drm/i915/glk: Add cold boot sequence for GLK DSI 

As per BSEPC, if device ready bit is '0' in enable IO sequence
then its a cold boot/reset scenario eg: S3/S4 resume. If cold boot
scenario detected in enable IO, then prepare port immediately.
In normal boot scenario, prepare port after glk_dsi_device_ready().
Without cold boot sequence enabled, features like S3/S4 doesn't work.

Signed-off-by: Madhav Chauhan <madhav.chauhan@intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1497340095-5877-2-git-send-email-madhav.chauhan@intel.com
This commit is contained in:
Madhav Chauhan 2017-06-13 13:18:15 +05:30 committed by Jani Nikula
parent 74e4ce6a78
commit 8a1deb329f
1 changed files with 51 additions and 28 deletions
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33
drivers/gpu/drm/i915/intel_dsi.c
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@ -346,12 +346,13 @@ static bool intel_dsi_compute_config(struct intel_encoder *encoder,
return true;
}
static void glk_dsi_enable_io(struct intel_encoder *encoder)
static bool glk_dsi_enable_io(struct intel_encoder *encoder)
{
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;
bool cold_boot = false;
/* Set the MIPI mode
* If MIPI_Mode is off, then writing to LP_Wake bit is not reflecting.
@ -370,6 +371,9 @@ static void glk_dsi_enable_io(struct intel_encoder *encoder)
/* Program LP Wake */
for_each_dsi_port(port, intel_dsi->ports) {
tmp = I915_READ(MIPI_CTRL(port));
if (!(I915_READ(MIPI_DEVICE_READY(port)) & DEVICE_READY))
tmp &= ~GLK_LP_WAKE;
else
tmp |= GLK_LP_WAKE;
I915_WRITE(MIPI_CTRL(port), tmp);
}
@ -381,6 +385,14 @@ static void glk_dsi_enable_io(struct intel_encoder *encoder)
GLK_MIPIIO_PORT_POWERED, 20))
DRM_ERROR("MIPIO port is powergated\n");
}
/* Check for cold boot scenario */
for_each_dsi_port(port, intel_dsi->ports) {
cold_boot |= !(I915_READ(MIPI_DEVICE_READY(port)) &
DEVICE_READY);
}
return cold_boot;
}
static void glk_dsi_device_ready(struct intel_encoder *encoder)
@ -410,8 +422,7 @@ static void glk_dsi_device_ready(struct intel_encoder *encoder)
val |= DEVICE_READY;
I915_WRITE(MIPI_DEVICE_READY(port), val);
usleep_range(10, 15);
}
} else {
/* Enter ULPS */
val = I915_READ(MIPI_DEVICE_READY(port));
val &= ~ULPS_STATE_MASK;
@ -439,6 +450,7 @@ static void glk_dsi_device_ready(struct intel_encoder *encoder)
val &= ~GLK_LP_WAKE;
I915_WRITE(MIPI_CTRL(port), val);
}
}
/* Wait for Stop state */
for_each_dsi_port(port, intel_dsi->ports) {
@ -778,6 +790,7 @@ static void intel_dsi_pre_enable(struct intel_encoder *encoder,
struct intel_dsi *intel_dsi = enc_to_intel_dsi(&encoder->base);
enum port port;
u32 val;
bool glk_cold_boot = false;
DRM_DEBUG_KMS("\n");
@ -808,6 +821,7 @@ static void intel_dsi_pre_enable(struct intel_encoder *encoder,
I915_WRITE(DSPCLK_GATE_D, val);
}
if (!IS_GEMINILAKE(dev_priv))
intel_dsi_prepare(encoder, pipe_config);
/* Power on, try both CRC pmic gpio and VBT */
@ -819,12 +833,21 @@ static void intel_dsi_pre_enable(struct intel_encoder *encoder,
/* Deassert reset */
intel_dsi_vbt_exec_sequence(intel_dsi, MIPI_SEQ_DEASSERT_RESET);
if (IS_GEMINILAKE(dev_priv))
glk_dsi_enable_io(encoder);
if (IS_GEMINILAKE(dev_priv)) {
glk_cold_boot = glk_dsi_enable_io(encoder);
/* Prepare port in cold boot(s3/s4) scenario */
if (glk_cold_boot)
intel_dsi_prepare(encoder, pipe_config);
}
/* Put device in ready state (LP-11) */
intel_dsi_device_ready(encoder);
/* Prepare port in normal boot scenario */
if (IS_GEMINILAKE(dev_priv) && !glk_cold_boot)
intel_dsi_prepare(encoder, pipe_config);
/* Send initialization commands in LP mode */
intel_dsi_vbt_exec_sequence(intel_dsi, MIPI_SEQ_INIT_OTP);