gfx.c

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/* SPDX-License-Identifier: GPL-2.0-only */
 
#include <device/pci_ops.h>
#include <soc/gfx.h>
#include <soc/pci_devs.h>
#include <soc/romstage.h>
 
void gfx_init(void)
{
        uint32_t ggc;
        uint8_t msac;
        const unsigned int gfx_dev = PCI_DEV(0, GFX_DEV, GFX_FUNC);
 
        /* The GFX device needs to set the aperture, gtt stolen size, and
         * graphics stolen memory stolen size before running MRC. For now
         * just hard code the defaults. Options can be added to the device
         * tree if needed. */
 
        ggc = pci_read_config32(gfx_dev, GGC);
        msac = pci_read_config8(gfx_dev, MSAC);
 
        ggc &= ~(GGC_GTT_SIZE_MASK | GGC_GSM_SIZE_MASK);
        /* 32MB GSM is not supported with <C0 stepping. */
        ggc |= GGC_GTT_SIZE_2MB | GGC_GSM_SIZE_64MB;
        /* Enable VGA decoding as well. */
        ggc &= ~(GGC_VGA_DISABLE);
 
        msac &= ~(APERTURE_SIZE_MASK);
        msac |= APERTURE_SIZE_256MB;
 
        pci_write_config32(gfx_dev, GGC, ggc);
        pci_write_config8(gfx_dev, MSAC, msac);
}