Signed-off-by: Gaurav K Singh <gaurav.k.singh@xxxxxxxxx>
Signed-off-by: Shobhit Kumar <shobhit.kumar@xxxxxxxxx>
---
drivers/gpu/drm/i915/i915_reg.h | 4 ++++
drivers/gpu/drm/i915/intel_bios.h | 3 ++-
drivers/gpu/drm/i915/intel_dsi.c | 8 ++++++++
drivers/gpu/drm/i915/intel_dsi.h | 6 ++++++
drivers/gpu/drm/i915/intel_dsi_panel_vbt.c | 21 +++++++++++++++++++++
5 files changed, 41 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 922d807..3ed5774 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -5662,6 +5662,10 @@ enum punit_power_well {
#define GEN8_PMINTR_REDIRECT_TO_NON_DISP (1<<31)
#define VLV_PWRDWNUPCTL 0xA294
+#define VLV_CHICKEN_3 0x7040C
+#define PIXEL_OVERLAP_CNT_MASK (3 << 30)
+#define PIXEL_OVERLAP_CNT_SHIFT 30
+
#define GEN6_PMISR 0x44020
#define GEN6_PMIMR 0x44024 /* rps_lock */
#define GEN6_PMIIR 0x44028
diff --git a/drivers/gpu/drm/i915/intel_bios.h b/drivers/gpu/drm/i915/intel_bios.h
index 7603765..39dfb65 100644
--- a/drivers/gpu/drm/i915/intel_bios.h
+++ b/drivers/gpu/drm/i915/intel_bios.h
@@ -798,7 +798,8 @@ struct mipi_config {
#define DUAL_LINK_PIXEL_ALT 2
u16 dual_link:2;
u16 lane_cnt:2;
- u16 rsvd3:12;
+ u16 pixel_overlap:3;
+ u16 rsvd3:9;
u16 rsvd4;
diff --git a/drivers/gpu/drm/i915/intel_dsi.c b/drivers/gpu/drm/i915/intel_dsi.c
index 3b1890e..583c7fd 100644
--- a/drivers/gpu/drm/i915/intel_dsi.c
+++ b/drivers/gpu/drm/i915/intel_dsi.c
@@ -116,6 +116,14 @@ static void intel_dsi_port_enable(struct intel_encoder *encoder)
<< DUAL_LINK_MODE_SHIFT;
port_control |= pipe ? LANE_CONFIGURATION_DUAL_LINK_B :
LANE_CONFIGURATION_DUAL_LINK_A;
+
+ if (intel_dsi->dual_link & MIPI_DUAL_LINK_FRONT_BACK) {
+ temp = I915_READ(VLV_CHICKEN_3);
+ temp &= ~PIXEL_OVERLAP_CNT_MASK |
+ intel_dsi->pixel_overlap <<
+ PIXEL_OVERLAP_CNT_SHIFT;
+ I915_WRITE(VLV_CHICKEN_3, temp);
+ }
/*For Port A */
temp = I915_READ(MIPI_PORT_CTRL(0));
temp = temp | port_control;
diff --git a/drivers/gpu/drm/i915/intel_dsi.h b/drivers/gpu/drm/i915/intel_dsi.h
index 950ab41..7fac460 100644
--- a/drivers/gpu/drm/i915/intel_dsi.h
+++ b/drivers/gpu/drm/i915/intel_dsi.h
@@ -28,6 +28,11 @@
#include <drm/drm_crtc.h>
#include "intel_drv.h"
+/* Dual Link support */
+#define MIPI_DUAL_LINK_NONE 0
+#define MIPI_DUAL_LINK_FRONT_BACK 1
+#define MIPI_DUAL_LINK_PIXEL_ALT 2
+
struct intel_dsi_device {
unsigned int panel_id;
const char *name;
@@ -102,6 +107,7 @@ struct intel_dsi {
u8 escape_clk_div;
u8 dual_link;
+ u8 pixel_overlap;
u32 port_bits;
u32 bw_timer;
u32 dphy_reg;
diff --git a/drivers/gpu/drm/i915/intel_dsi_panel_vbt.c b/drivers/gpu/drm/i915/intel_dsi_panel_vbt.c
index d424ebc..8bc911b 100644
--- a/drivers/gpu/drm/i915/intel_dsi_panel_vbt.c
+++ b/drivers/gpu/drm/i915/intel_dsi_panel_vbt.c
@@ -284,6 +284,7 @@ static bool generic_init(struct intel_dsi_device *dsi)
intel_dsi->pixel_format = mipi_config->videomode_color_format << 7;
intel_dsi->port = 0;
intel_dsi->dual_link = mipi_config->dual_link;
+ intel_dsi->pixel_overlap = mipi_config->pixel_overlap;
if (intel_dsi->pixel_format == VID_MODE_FORMAT_RGB666)
bits_per_pixel = 18;
@@ -303,6 +304,20 @@ static bool generic_init(struct intel_dsi_device *dsi)
pclk = mode->clock;
+ /* In dual link mode each port needs half of pixel clock */
+ if (intel_dsi->dual_link) {
+ pclk = pclk / 2;
+
+ /* we can enable pixel_overlap if needed by panel. In this
+ * case we need to increase the pixelclock for extra pixels
+ */
+ if (intel_dsi->dual_link & MIPI_DUAL_LINK_FRONT_BACK) {
+ pclk += DIV_ROUND_UP(mode->vtotal *
+ intel_dsi->pixel_overlap *
+ 60, 1000);
+ }
+ }
+
/* Burst Mode Ratio
* Target ddr frequency from VBT / non burst ddr freq
* multiply by 100 to preserve remainder
@@ -497,6 +512,12 @@ static bool generic_init(struct intel_dsi_device *dsi)
DRM_DEBUG_KMS("Clockstop %s\n", intel_dsi->clock_stop ?
"disabled" : "enabled");
DRM_DEBUG_KMS("Mode %s\n", intel_dsi->operation_mode ? "command" : "video");
+ if (intel_dsi->dual_link == MIPI_DUAL_LINK_FRONT_BACK)
+ DRM_DEBUG_KMS("Dual link: MIPI_DUAL_LINK_FRONT_BACK\n");
+ else if (intel_dsi->dual_link == MIPI_DUAL_LINK_PIXEL_ALT)
+ DRM_DEBUG_KMS("Dual link: MIPI_DUAL_LINK_PIXEL_ALT\n");
+ else
+ DRM_DEBUG_KMS("Dual link: NONE\n");
DRM_DEBUG_KMS("Pixel Format %d\n", intel_dsi->pixel_format);
DRM_DEBUG_KMS("TLPX %d\n", intel_dsi->escape_clk_div);
DRM_DEBUG_KMS("LP RX Timeout 0x%x\n", intel_dsi->lp_rx_timeout);
--
1.7.9.5
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