[Intel-gfx] [PATCH 08/12] drm/i915/bxt: DSI disable and post-disable
Uma Shankar
uma.shankar at intel.com
Fri May 22 09:06:01 PDT 2015
From: Shashank Sharma <shashank.sharma at intel.com>
This patch contains changes to support DSI disble sequence in BXT.
The changes are:
1. BXT specific changes in clear_device_ready function.
2. BXT specific changes in DSI disable and post-disable functions.
3. Add a new function to reset BXT Dphy clock and dividers
(bxt_dsi_reset_clocks).
4. Moved some part of the vlv clock reset code, in a new function
(vlv_dsi_reset_clocks) maintaining the exact same sequence.
5. Wrapper function to call corresponding reset clock function.
Signed-off-by: Uma Shankar <uma.shankar at intel.com>
Signed-off-by: Shashank Sharma <shashank.sharma at intel.com>
---
drivers/gpu/drm/i915/intel_dsi.c | 39 ++++++++++++++++++++------------
drivers/gpu/drm/i915/intel_dsi.h | 2 ++
drivers/gpu/drm/i915/intel_dsi_pll.c | 41 ++++++++++++++++++++++++++++++++++
3 files changed, 68 insertions(+), 14 deletions(-)
diff --git a/drivers/gpu/drm/i915/intel_dsi.c b/drivers/gpu/drm/i915/intel_dsi.c
index 729faf6..e4b96bc 100644
--- a/drivers/gpu/drm/i915/intel_dsi.c
+++ b/drivers/gpu/drm/i915/intel_dsi.c
@@ -427,12 +427,16 @@ static void intel_dsi_port_disable(struct intel_encoder *encoder)
struct intel_dsi *intel_dsi = enc_to_intel_dsi(&encoder->base);
enum port port;
u32 temp;
+ u32 port_ctrl;
for_each_dsi_port(port, intel_dsi->ports) {
/* de-assert ip_tg_enable signal */
- temp = I915_READ(MIPI_PORT_CTRL(port));
- I915_WRITE(MIPI_PORT_CTRL(port), temp & ~DPI_ENABLE);
- POSTING_READ(MIPI_PORT_CTRL(port));
+ port_ctrl = IS_BROXTON(dev) ?
+ BXT_MIPI_PORT_CTRL(port) :
+ MIPI_PORT_CTRL(port);
+ temp = I915_READ(port_ctrl);
+ I915_WRITE(port_ctrl, temp & ~DPI_ENABLE);
+ POSTING_READ(port_ctrl);
}
}
@@ -570,12 +574,7 @@ static void intel_dsi_disable(struct intel_encoder *encoder)
/* Panel commands can be sent when clock is in LP11 */
I915_WRITE(MIPI_DEVICE_READY(port), 0x0);
- temp = I915_READ(MIPI_CTRL(port));
- temp &= ~ESCAPE_CLOCK_DIVIDER_MASK;
- I915_WRITE(MIPI_CTRL(port), temp |
- intel_dsi->escape_clk_div <<
- ESCAPE_CLOCK_DIVIDER_SHIFT);
-
+ intel_dsi_reset_clocks(encoder, port);
I915_WRITE(MIPI_EOT_DISABLE(port), CLOCKSTOP);
temp = I915_READ(MIPI_DSI_FUNC_PRG(port));
@@ -594,12 +593,15 @@ static void intel_dsi_disable(struct intel_encoder *encoder)
static void intel_dsi_clear_device_ready(struct intel_encoder *encoder)
{
+ struct drm_device *dev = encoder->base.dev;
struct drm_i915_private *dev_priv = encoder->base.dev->dev_private;
struct intel_dsi *intel_dsi = enc_to_intel_dsi(&encoder->base);
enum port port;
u32 val;
+ u32 port_ctrl;
DRM_DEBUG_KMS("\n");
+
for_each_dsi_port(port, intel_dsi->ports) {
I915_WRITE(MIPI_DEVICE_READY(port), DEVICE_READY |
@@ -614,18 +616,27 @@ static void intel_dsi_clear_device_ready(struct intel_encoder *encoder)
ULPS_STATE_ENTER);
usleep_range(2000, 2500);
+ if (IS_BROXTON(dev))
+ port_ctrl = BXT_MIPI_PORT_CTRL(port);
+ else if (IS_VALLEYVIEW(dev))
+ port_ctrl = MIPI_PORT_CTRL(PORT_A);
+ else {
+ DRM_ERROR("Invalid DSI device to clear device ready\n");
+ return;
+ }
+
/* Wait till Clock lanes are in LP-00 state for MIPI Port A
* only. MIPI Port C has no similar bit for checking
*/
- if (wait_for(((I915_READ(MIPI_PORT_CTRL(PORT_A)) & AFE_LATCHOUT)
+ if (wait_for(((I915_READ(port_ctrl) & AFE_LATCHOUT)
== 0x00000), 30))
DRM_ERROR("DSI LP not going Low\n");
/* Disable MIPI PHY transparent latch
* Common bit for both MIPI Port A & MIPI Port C
*/
- val = I915_READ(MIPI_PORT_CTRL(PORT_A));
- I915_WRITE(MIPI_PORT_CTRL(PORT_A), val & ~LP_OUTPUT_HOLD);
+ val = I915_READ(port_ctrl);
+ I915_WRITE(port_ctrl, val & ~LP_OUTPUT_HOLD);
usleep_range(1000, 1500);
I915_WRITE(MIPI_DEVICE_READY(port), 0x00);
@@ -637,14 +648,14 @@ static void intel_dsi_clear_device_ready(struct intel_encoder *encoder)
static void intel_dsi_post_disable(struct intel_encoder *encoder)
{
- struct drm_i915_private *dev_priv = encoder->base.dev->dev_private;
+ struct drm_device *dev = encoder->base.dev;
+ struct drm_i915_private *dev_priv = dev->dev_private;
struct intel_dsi *intel_dsi = enc_to_intel_dsi(&encoder->base);
u32 val;
DRM_DEBUG_KMS("\n");
intel_dsi_disable(encoder);
-
intel_dsi_clear_device_ready(encoder);
val = I915_READ(DSPCLK_GATE_D);
diff --git a/drivers/gpu/drm/i915/intel_dsi.h b/drivers/gpu/drm/i915/intel_dsi.h
index af5a09f..8bc8d94 100644
--- a/drivers/gpu/drm/i915/intel_dsi.h
+++ b/drivers/gpu/drm/i915/intel_dsi.h
@@ -125,6 +125,8 @@ extern void intel_enable_dsi_pll(struct intel_encoder *encoder);
extern void intel_disable_dsi_pll(struct intel_encoder *encoder);
extern u32 vlv_get_dsi_pclk(struct intel_encoder *encoder, int pipe_bpp);
extern void bxt_dsi_program_clocks(struct drm_device *dev, int pipe);
+extern void intel_dsi_reset_clocks(struct intel_encoder *encoder,
+ enum port port);
struct drm_panel *vbt_panel_init(struct intel_dsi *intel_dsi, u16 panel_id);
diff --git a/drivers/gpu/drm/i915/intel_dsi_pll.c b/drivers/gpu/drm/i915/intel_dsi_pll.c
index 9a8a35d..49330b0 100644
--- a/drivers/gpu/drm/i915/intel_dsi_pll.c
+++ b/drivers/gpu/drm/i915/intel_dsi_pll.c
@@ -369,6 +369,19 @@ u32 vlv_get_dsi_pclk(struct intel_encoder *encoder, int pipe_bpp)
return pclk;
}
+void vlv_dsi_reset_clocks(struct intel_encoder *encoder, enum port port)
+{
+ u32 temp;
+ struct drm_i915_private *dev_priv = encoder->base.dev->dev_private;
+ struct intel_dsi *intel_dsi = enc_to_intel_dsi(&encoder->base);
+
+ temp = I915_READ(MIPI_CTRL(port));
+ temp &= ~ESCAPE_CLOCK_DIVIDER_MASK;
+ I915_WRITE(MIPI_CTRL(port), temp |
+ intel_dsi->escape_clk_div <<
+ ESCAPE_CLOCK_DIVIDER_SHIFT);
+}
+
/* Program BXT Mipi clocks and dividers */
void bxt_dsi_program_clocks(struct drm_device *dev, int pipe)
{
@@ -515,3 +528,31 @@ void intel_disable_dsi_pll(struct intel_encoder *encoder)
else
DRM_ERROR("Invalid DSI device to pre_pll_enable\n");
}
+
+void bxt_dsi_reset_clocks(struct intel_encoder *encoder, enum port port)
+{
+ u32 tmp;
+ struct drm_device *dev = encoder->base.dev;
+ struct drm_i915_private *dev_priv = dev->dev_private;
+
+ /* Clear old configurations */
+ tmp = I915_READ(BXT_MIPI_CLOCK_CTL);
+ tmp &= ~(BXT_MIPI_TX_ESCLK_FIXDIV_MASK(port));
+ tmp &= ~(BXT_MIPI_RX_ESCLK_FIXDIV_MASK(port));
+ tmp &= ~(BXT_MIPI_ESCLK_VAR_DIV_MASK(port));
+ tmp &= ~(BXT_MIPI_DPHY_DIVIDER_MASK(port));
+ I915_WRITE(BXT_MIPI_CLOCK_CTL, tmp);
+ I915_WRITE(MIPI_EOT_DISABLE(port), CLOCKSTOP);
+}
+
+void intel_dsi_reset_clocks(struct intel_encoder *encoder, enum port port)
+{
+ struct drm_device *dev = encoder->base.dev;
+
+ if (IS_BROXTON(dev))
+ bxt_dsi_reset_clocks(encoder, port);
+ else if (IS_VALLEYVIEW(dev))
+ vlv_dsi_reset_clocks(encoder, port);
+ else
+ DRM_ERROR("Invalid DSI device to reset clocks\n");
+}
--
1.7.9.5
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