[Intel-gfx] [PATCH 10/14] drm/i915: Add MIPI_IO WA

[Vidya Srinivas]

From: Uma Shankar <uma.shankar at intel.com>

Enable MIPI IO WA for BXT DSI as per bspec.

Signed-off-by: Uma Shankar <uma.shankar at intel.com>
---
 drivers/gpu/drm/i915/i915_reg.h  | 3 +++
 drivers/gpu/drm/i915/intel_dsi.c | 9 +++++++++
 2 files changed, 12 insertions(+)

diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 71b978a..b9d7e98 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -8301,6 +8301,9 @@ enum {
 #define _BXT_MIPIC_PORT_CTRL				0x6B8C0
 #define BXT_MIPI_PORT_CTRL(tc)	_MMIO_MIPI(tc, _BXT_MIPIA_PORT_CTRL, _BXT_MIPIC_PORT_CTRL)
 
+#define BXT_P_CR_GT_DISP_PWRON_0_2_0_GTTMMADR		_MMIO(0x138090)
+#define  MIPIO_RST_CTRL					(1 << 2)
+
 #define  DPI_ENABLE					(1 << 31) /* A + C */
 #define  MIPIA_MIPI4DPHY_DELAY_COUNT_SHIFT		27
 #define  MIPIA_MIPI4DPHY_DELAY_COUNT_MASK		(0xf << 27)
diff --git a/drivers/gpu/drm/i915/intel_dsi.c b/drivers/gpu/drm/i915/intel_dsi.c
index a4bda92..9252490 100644
--- a/drivers/gpu/drm/i915/intel_dsi.c
+++ b/drivers/gpu/drm/i915/intel_dsi.c
@@ -366,6 +366,11 @@ static void bxt_dsi_device_ready(struct intel_encoder *encoder)
 
 	DRM_DEBUG_KMS("\n");
 
+	/* Add MIPI IO reset programming for modeset */
+	val = I915_READ(BXT_P_CR_GT_DISP_PWRON_0_2_0_GTTMMADR);
+	I915_WRITE(BXT_P_CR_GT_DISP_PWRON_0_2_0_GTTMMADR,
+					val | MIPIO_RST_CTRL);
+
 	/* Enable MIPI PHY transparent latch */
 	for_each_dsi_port(port, intel_dsi->ports) {
 		val = I915_READ(BXT_MIPI_PORT_CTRL(port));
@@ -757,6 +762,10 @@ static void intel_dsi_post_disable(struct intel_encoder *encoder,
 	drm_panel_power_off(intel_dsi->panel);
 	msleep(intel_dsi->panel_off_delay);
 
+	val = I915_READ(BXT_P_CR_GT_DISP_PWRON_0_2_0_GTTMMADR);
+	I915_WRITE(BXT_P_CR_GT_DISP_PWRON_0_2_0_GTTMMADR,
+					val & ~MIPIO_RST_CTRL);
+
 	intel_disable_dsi_pll(encoder);
 
 	/* Panel Disable over CRC PMIC */
-- 
1.9.1