Calculate transcoder flags based on pipe config

Works fine with all three panels with the change of 6 bits per color.

Change-Id: Ia47d152e62d1879150d8cf9a6657b62007ef5c0e
Reviewed-on: https://gerrit.chromium.org/gerrit/63762
Reviewed-by: Ronald G. Minnich <rminnich@chromium.org>
Commit-Queue: Furquan Shaikh <furquan@chromium.org>
Tested-by: Furquan Shaikh <furquan@chromium.org>
Reviewed-on: http://review.coreboot.org/4402
Tested-by: build bot (Jenkins)
Reviewed-by: Patrick Georgi <patrick@georgi-clan.de>

3 files changed, 91 insertions, 0 deletions

diff --git a/src/drivers/intel/gma/i915.h b/src/drivers/intel/gma/i915.h
index 62fe0230e6..1aed2bfb09 100644
--- a/src/drivers/intel/gma/i915.h
+++ b/src/drivers/intel/gma/i915.h
@@ -40,6 +40,22 @@
 #define PRB0_START	0x02038
 #define PRB0_CTL	0x0203c
 
+enum port {
+	PORT_A = 0,
+	PORT_B,
+	PORT_C,
+	PORT_D,
+	PORT_E,
+	I915_NUM_PORTS
+};
+
+enum pipe {
+	PIPE_A = 0,
+	PIPE_B,
+	PIPE_C,
+	I915_NUM_PIPES
+};
+
 /* debug enums. These are for printks that, due to their place in the
  * middle of graphics device IO, might change timing.  Use with care
  * or not at all.
@@ -143,6 +159,7 @@ struct intel_dp {
 	u32 pipesrc;
 	u32 stride;
 	struct intel_dp_m_n m_n;
+	u32 flags;
 };
 
 /* we may yet need these. */
@@ -197,3 +214,10 @@ void intel_dp_compute_m_n(unsigned int bits_per_pixel,
                           unsigned int pixel_clock,
                           unsigned int link_clock,
                           struct intel_dp_m_n *m_n);
+
+u32 intel_ddi_calc_transcoder_flags(u32 pipe_bpp,
+				    enum port port,
+				    enum pipe pipe,
+				    int type,
+				    int lane_count,
+				    int pf_sz);
diff --git a/src/drivers/intel/gma/i915_reg.h b/src/drivers/intel/gma/i915_reg.h
index 27a3d2b7da..d0c8c85f94 100644
--- a/src/drivers/intel/gma/i915_reg.h
+++ b/src/drivers/intel/gma/i915_reg.h
@@ -4554,6 +4554,7 @@
 #define  DDI_BUF_EMP_MASK			(0xf<<24)
 #define  DDI_BUF_IS_IDLE			(1<<7)
 #define  DDI_A_4_LANES				(1<<4)
+#define  DDI_PORT_WIDTH(width)                  (((width) - 1) << 1)
 #define  DDI_PORT_WIDTH_X1			(0<<1)
 #define  DDI_PORT_WIDTH_X2			(1<<1)
 #define  DDI_PORT_WIDTH_X4			(3<<1)
diff --git a/src/drivers/intel/gma/intel_ddi.c b/src/drivers/intel/gma/intel_ddi.c
index 220bd47100..f1a40f1e32 100644
--- a/src/drivers/intel/gma/intel_ddi.c
+++ b/src/drivers/intel/gma/intel_ddi.c
@@ -157,3 +157,69 @@ void intel_ddi_prepare_link_retrain(struct intel_dp *intel_dp, int port)
 
 	udelay(600);
 }
+
+u32 intel_ddi_calc_transcoder_flags(u32 pipe_bpp,
+				    enum port port,
+				    enum pipe pipe,
+				    int type,
+				    int lane_count,
+				    int pf_sz)
+{
+	u32 temp;
+
+	temp = TRANS_DDI_FUNC_ENABLE;
+	temp |= TRANS_DDI_SELECT_PORT(port);
+
+	switch (pipe_bpp) {
+	case 18:
+		temp |= TRANS_DDI_BPC_6;
+		break;
+	case 24:
+		temp |= TRANS_DDI_BPC_8;
+		break;
+	case 30:
+		temp |= TRANS_DDI_BPC_10;
+		break;
+	case 36:
+		temp |= TRANS_DDI_BPC_12;
+		break;
+	default:
+		printk(BIOS_ERR, "Invalid pipe_bpp: %d, *** Initialization will not succeed *** \n", pipe_bpp);
+	}
+
+	if (port == PORT_A) {
+		switch (pipe) {
+		case PIPE_A:
+			if (pf_sz)
+				temp |= TRANS_DDI_EDP_INPUT_A_ONOFF;
+			else
+				temp |= TRANS_DDI_EDP_INPUT_A_ON;
+			break;
+		case PIPE_B:
+			temp |= TRANS_DDI_EDP_INPUT_B_ONOFF;
+			break;
+		case PIPE_C:
+			temp |= TRANS_DDI_EDP_INPUT_C_ONOFF;
+			break;
+		default:
+			printk(BIOS_ERR, "Invalid pipe %d\n", pipe);
+		}
+	}
+
+	/* We need to check for TRANS_DDI_PVSYNC and TRANS_DDI_PHSYNC -- How? */
+
+	if (type == INTEL_OUTPUT_HDMI) {
+		/* Need to understand when to set TRANS_DDI_MODE_SELECT_HDMI / TRANS_DDI_MODE_SELECT_DVI */
+	} else if (type == INTEL_OUTPUT_ANALOG) {
+		/* Set TRANS_DDI_MODE_SELECT_FDI with lane_count */
+	} else if (type == INTEL_OUTPUT_DISPLAYPORT ||
+		   type == INTEL_OUTPUT_EDP) {
+		temp |= TRANS_DDI_MODE_SELECT_DP_SST;
+
+		temp |= DDI_PORT_WIDTH(lane_count);
+	} else {
+		printk(BIOS_ERR, "Invalid type %d for pipe\n", type);
+	}
+
+	return temp;
+}