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/* SPDX-License-Identifier: MIT */
#include <types.h>
#include <console/console.h>
#include <drivers/intel/gma/i915.h>
/* HDMI/DVI modes ignore everything but the last 2 items. So we share
* them for both DP and FDI transports, allowing those ports to
* automatically adapt to HDMI connections as well.
*/
static u32 hsw_ddi_translations_dp[] = {
0x00FFFFFF, 0x0006000E, /* DP parameters */
0x00D75FFF, 0x0005000A,
0x00C30FFF, 0x00040006,
0x80AAAFFF, 0x000B0000,
0x00FFFFFF, 0x0005000A,
0x00D75FFF, 0x000C0004,
0x80C30FFF, 0x000B0000,
0x00FFFFFF, 0x00040006,
0x80D75FFF, 0x000B0000,
0x00FFFFFF, 0x00040006 /* HDMI parameters */
};
static u32 hsw_ddi_translations_fdi[] = {
0x00FFFFFF, 0x0007000E, /* FDI parameters */
0x00D75FFF, 0x000F000A,
0x00C30FFF, 0x00060006,
0x00AAAFFF, 0x001E0000,
0x00FFFFFF, 0x000F000A,
0x00D75FFF, 0x00160004,
0x00C30FFF, 0x001E0000,
0x00FFFFFF, 0x00060006,
0x00D75FFF, 0x001E0000,
0x00FFFFFF, 0x00040006 /* HDMI parameters */
};
/* On Haswell, DDI port buffers must be programmed with correct values
* in advance. The buffer values are different for FDI and DP modes,
* but the HDMI/DVI fields are shared among those. So we program the DDI
* in either FDI or DP modes only, as HDMI connections will work with both
* of those.
*/
static void intel_prepare_ddi_buffers(int port, int use_fdi_mode)
{
u32 reg;
int i;
u32 *ddi_translations = ((use_fdi_mode) ?
hsw_ddi_translations_fdi :
hsw_ddi_translations_dp);
printk(BIOS_SPEW, "Initializing DDI buffers for port %d in %s mode\n",
port,
use_fdi_mode ? "FDI" : "DP");
for (i=0,reg=DDI_BUF_TRANS(port);i < ARRAY_SIZE(hsw_ddi_translations_fdi);i++) {
gtt_write(reg,ddi_translations[i]);
reg += 4;
}
}
void intel_prepare_ddi(void)
{
int port;
u32 use_fdi = 1;
for (port = PORT_A; port < PORT_E; port++)
intel_prepare_ddi_buffers(port, !use_fdi);
intel_prepare_ddi_buffers(PORT_E, use_fdi);
}
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