From: Uma Shankar <uma.shankar@xxxxxxxxx>
Enable MIPI IO WA for BXT DSI as per bspec.
Signed-off-by: Uma Shankar <uma.shankar@xxxxxxxxx>
---
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
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