Arthur Heymans (arthur@aheymans.xyz) just uploaded a new patch set to gerrit, which you can find at https://review.coreboot.org/16338
-gerrit
commit 47ade90f6f4b79fabf4db2f422bcc0416f943e12 Author: Arthur Heymans arthur@aheymans.xyz Date: Sat Aug 27 01:09:19 2016 +0200
nb/gm45/gma.c: enable VESA framebuffer mode on VGA output
This implements "Keep VESA framebuffer" behavior on VGA output of gm45. This patch reuses Linux code to compute vga divisors.
Change-Id: I2db5dd9bb1a7e309ca763b1559b89f7f5c8e6d3d Signed-off-by: Arthur Heymans arthur@aheymans.xyz --- src/northbridge/intel/gm45/gma.c | 258 ++++++++++++++++++++++++++++++++------- 1 file changed, 216 insertions(+), 42 deletions(-)
diff --git a/src/northbridge/intel/gm45/gma.c b/src/northbridge/intel/gm45/gma.c index 74c9bc3..8e4d942 100644 --- a/src/northbridge/intel/gm45/gma.c +++ b/src/northbridge/intel/gm45/gma.c @@ -25,6 +25,7 @@ #include <cpu/x86/msr.h> #include <cpu/x86/mtrr.h> #include <kconfig.h> +#include <commonlib/helpers.h>
#include "drivers/intel/gma/i915_reg.h" #include "chip.h" @@ -35,6 +36,18 @@ #include <pc80/vga.h> #include <pc80/vga_io.h>
+#define DIV_ROUND_CLOSEST(x, divisor)( \ +{ \ + typeof(x) __x = x; \ + typeof(divisor) __d = divisor; \ + (((typeof(x))-1) > 0 || \ + ((typeof(divisor))-1) > 0 || (__x) > 0) ? \ + (((__x) + ((__d) / 2)) / (__d)) : \ + (((__x) - ((__d) / 2)) / (__d)); \ +} \ +) + + static struct resource *gtt_res = NULL;
u32 gtt_read(u32 reg) @@ -345,14 +358,39 @@ static void gma_init_lvds(const struct northbridge_intel_gm45_config *info, }
static void gma_init_vga(const struct northbridge_intel_gm45_config *info, - u8 *mmio) + u8 *mmio, u32 physbase, u16 piobase, u32 lfb) {
int i; - u32 hactive, vactive; + u8 edid_data[128]; + struct edid edid; + struct edid_mode *mode; + u32 hactive, vactive, right_border, bottom_border; + int hpolarity, vpolarity; + u32 vsync, hsync, vblank, hblank, hfront_porch, vfront_porch; + u32 target_frequency; + u32 err_most = 0xffffffff; + u32 pixel_p1 = 1; + u32 pixel_n = 1; + u32 pixel_m1 = 1; + u32 pixel_m2 = 1; + u32 link_frequency = info->gfx.link_frequency_270_mhz ? 270000 : 162000; + u32 data_m1; + u32 data_n1 = 0x00800000; + u32 link_m1; + u32 link_n1 = 0x00040000; + u32 refclk = 96000; +
vga_gr_write(0x18, 0);
+ /* Setup GTT. */ + for (i = 0; i < 0x2000; i++) { + outl((i << 2) | 1, piobase); + outl(physbase + (i << 12) + 1, piobase + 4); + } + + write32(mmio + VGA0, 0x31108); write32(mmio + VGA1, 0x31406);
@@ -363,8 +401,7 @@ static void gma_init_vga(const struct northbridge_intel_gm45_config *info, | ADPA_USE_VGA_HVPOLARITY | ADPA_VSYNC_CNTL_ENABLE | ADPA_HSYNC_CNTL_ENABLE - | ADPA_DPMS_ON - ); + | ADPA_DPMS_ON);
write32(mmio + 0x7041c, 0x0); write32(mmio + DPLL_MD(0), 0x3); @@ -382,95 +419,230 @@ static void gma_init_vga(const struct northbridge_intel_gm45_config *info, for (i = 0; i <= 0x18; i++) vga_cr_write(i, cr[i]);
+ udelay(1); + + intel_gmbus_read_edid(mmio + GMBUS0, 2, 0x50, edid_data, 128); + intel_gmbus_stop(mmio + GMBUS0); + decode_edid(edid_data, + sizeof(edid_data), &edid); + mode = &edid.mode; + + /* Disable screen memory to prevent garbage from appearing. */ vga_sr_write(1, vga_sr_read(1) | 0x20);
- hactive = 640; - vactive = 400; + hactive = edid.x_resolution; + vactive = edid.y_resolution; + right_border = mode->hborder; + bottom_border = mode->vborder; + hpolarity = (mode->phsync == '-'); + vpolarity = (mode->pvsync == '-'); + vsync = mode->vspw; + hsync = mode->hspw; + vblank = mode->vbl; + hblank = mode->hbl; + hfront_porch = mode->hso; + vfront_porch = mode->vso; + target_frequency = mode->pixel_clock; + + if (IS_ENABLED(CONFIG_FRAMEBUFFER_KEEP_VESA_MODE)) { + vga_sr_write(1, 1); + vga_sr_write(0x2, 0xf); + vga_sr_write(0x3, 0x0); + vga_sr_write(0x4, 0xe); + vga_gr_write(0, 0x0); + vga_gr_write(1, 0x0); + vga_gr_write(2, 0x0); + vga_gr_write(3, 0x0); + vga_gr_write(4, 0x0); + vga_gr_write(5, 0x0); + vga_gr_write(6, 0x5); + vga_gr_write(7, 0xf); + vga_gr_write(0x10, 0x1); + vga_gr_write(0x11, 0); + + edid.bytes_per_line = (edid.bytes_per_line + 63) & ~63; + + write32(mmio + DSPCNTR(0), DISPLAY_PLANE_ENABLE + | DISPPLANE_BGRX888); + write32(mmio + DSPADDR(0), 0); + write32(mmio + DSPSTRIDE(0), edid.bytes_per_line); + write32(mmio + DSPSURF(0), 0); + for (i = 0; i < 0x100; i++) + write32(mmio + LGC_PALETTE(0) + 4 * i, i * 0x010101); + } else { + vga_textmode_init(); + } + + u32 candn, candm1, candm2, candp1; + for (candn = 1; candn <= 4; candn++) { + for (candm1 = 23; candm1 >= 17; candm1--) { + for (candm2 = 11; candm2 >= 5; candm2--) { + for (candp1 = 3; candp1 >= 1; candp1--) { + u32 m = 5 * (candm1 + 2) + (candm2 + 2); + u32 p = candp1 * 10; /* 10 == p2 */ + u32 vco = DIV_ROUND_CLOSEST(refclk * m, candn + 2); + u32 dot = DIV_ROUND_CLOSEST(vco, p); + u32 this_err = ABS(dot - target_frequency); + if (this_err < err_most) { + err_most = this_err; + pixel_n = candn; + pixel_m1 = candm1; + pixel_m2 = candm2; + pixel_p1 = candp1; + } + } + } + } + } + + if (err_most == 0xffffffff) { + printk(BIOS_ERR, "Couldn't find GFX clock divisors\n"); + return; + } + + link_m1 = ((uint64_t)link_n1 * mode->pixel_clock) / link_frequency; + data_m1 = ((uint64_t)data_n1 * 18 * mode->pixel_clock) + / (link_frequency * 8 * 4); + + printk(BIOS_INFO, "bringing up panel at resolution %d x %d\n", + hactive, vactive); + printk(BIOS_DEBUG, "Borders %d x %d\n", + right_border, bottom_border); + printk(BIOS_DEBUG, "Blank %d x %d\n", + hblank, vblank); + printk(BIOS_DEBUG, "Sync %d x %d\n", + hsync, vsync); + printk(BIOS_DEBUG, "Front porch %d x %d\n", + hfront_porch, vfront_porch); + printk(BIOS_DEBUG, (info->gfx.use_spread_spectrum_clock + ? "Spread spectrum clock\n" : "DREF clock\n")); + printk(BIOS_DEBUG, "Polarities %d, %d\n", + hpolarity, vpolarity); + printk(BIOS_DEBUG, "Data M1=%d, N1=%d\n", + data_m1, data_n1); + printk(BIOS_DEBUG, "Link frequency %d kHz\n", + link_frequency); + printk(BIOS_DEBUG, "Link M1=%d, N1=%d\n", + link_m1, link_n1); + printk(BIOS_DEBUG, "Pixel N=%d, M1=%d, M2=%d, P1=%d\n", + pixel_n, pixel_m1, pixel_m2, pixel_p1); + printk(BIOS_DEBUG, "Pixel clock %d kHz\n", + 96000 * (5 * (pixel_m1 + 2) + (pixel_m2 + 2) / (pixel_n + 2) + / (pixel_p1 * 10)));
mdelay(1); - write32(mmio + FP0(0), 0x31108); - write32(mmio + DPLL(0), - DPLL_VCO_ENABLE | DPLLB_MODE_DAC_SERIAL - | DPLL_DAC_SERIAL_P2_CLOCK_DIV_10 - | 0x10601 - ); + write32(mmio + FP0(0), (pixel_n << 16) + | (pixel_m1 << 8) | pixel_m2); + write32(mmio + DPLL(0), DPLL_VCO_ENABLE + | DPLL_VGA_MODE_DIS | DPLLB_MODE_DAC_SERIAL + | (0x10000 << (pixel_p1 - 1)) + | (6 << 9)); + mdelay(1); - write32(mmio + DPLL(0), - DPLL_VCO_ENABLE | DPLLB_MODE_DAC_SERIAL - | DPLL_DAC_SERIAL_P2_CLOCK_DIV_10 - | 0x10601 - ); + write32(mmio + DPLL(0), DPLL_VCO_ENABLE + | DPLL_VGA_MODE_DIS | DPLLB_MODE_DAC_SERIAL + | (0x10000 << (pixel_p1 - 1)) + | (6 << 9));
write32(mmio + ADPA, ADPA_DAC_ENABLE | ADPA_PIPE_A_SELECT | ADPA_CRT_HOTPLUG_MONITOR_COLOR | ADPA_CRT_HOTPLUG_ENABLE - | ADPA_USE_VGA_HVPOLARITY | ADPA_VSYNC_CNTL_ENABLE | ADPA_HSYNC_CNTL_ENABLE | ADPA_DPMS_ON - ); + | (vpolarity ? 0 : ADPA_VSYNC_ACTIVE_HIGH) + | (hpolarity ? 0 : ADPA_VSYNC_ACTIVE_LOW));
write32(mmio + HTOTAL(0), - ((hactive - 1) << 16) + ((hactive + right_border + hblank - 1) << 16) | (hactive - 1)); write32(mmio + HBLANK(0), - ((hactive - 1) << 16) - | (hactive - 1)); + ((hactive + right_border + hblank - 1) << 16) + | (hactive + right_border - 1)); write32(mmio + HSYNC(0), - ((hactive - 1) << 16) - | (hactive - 1)); + ((hactive + right_border + hfront_porch + hsync - 1) << 16) + | (hactive + right_border + hfront_porch - 1));
- write32(mmio + VTOTAL(0), ((vactive - 1) << 16) - | (vactive - 1)); - write32(mmio + VBLANK(0), ((vactive - 1) << 16) + write32(mmio + VTOTAL(0), ((vactive + bottom_border + vblank - 1) << 16) | (vactive - 1)); + write32(mmio + VBLANK(0), ((vactive + bottom_border + vblank - 1) << 16) + | (vactive + bottom_border - 1)); write32(mmio + VSYNC(0), - ((vactive - 1) << 16) - | (vactive - 1)); + ((vactive + bottom_border + vfront_porch + vsync - 1) << 16) + | (vactive + bottom_border + vfront_porch - 1));
write32(mmio + PIPECONF(0), PIPECONF_DISABLE);
write32(mmio + PF_WIN_POS(0), 0); - - write32(mmio + PIPESRC(0), (639 << 16) | 399); - write32(mmio + PF_CTL(0), PF_ENABLE | PF_FILTER_MED_3x3); - write32(mmio + PF_WIN_SZ(0), vactive | (hactive << 16)); - write32(mmio + PFIT_CONTROL, 0xa0000000); + if (IS_ENABLED(CONFIG_FRAMEBUFFER_KEEP_VESA_MODE)) { + write32(mmio + PIPESRC(0), ((hactive - 1) << 16) + | (vactive - 1)); + write32(mmio + PF_CTL(0), 0); + write32(mmio + PF_WIN_SZ(0), 0); + write32(mmio + PFIT_CONTROL, 0); + } else { + write32(mmio + PIPESRC(0), (639 << 16) | 399); + write32(mmio + PF_CTL(0), PF_ENABLE | PF_FILTER_MED_3x3); + write32(mmio + PF_WIN_SZ(0), vactive | (hactive << 16)); + write32(mmio + PFIT_CONTROL, 0x80000000); + }
mdelay(1);
+ write32(mmio + PIPE_DATA_M1(0), 0x7e000000 | data_m1); + write32(mmio + PIPE_DATA_N1(0), data_n1); + write32(mmio + PIPE_LINK_M1(0), link_m1); + write32(mmio + PIPE_LINK_N1(0), link_n1); + write32(mmio + 0x000f000c, 0x00002040); mdelay(1); write32(mmio + 0x000f000c, 0x00002050); write32(mmio + 0x00060100, 0x00044000); mdelay(1); + write32(mmio + PIPECONF(0), PIPECONF_BPP_6); + write32(mmio + 0x000f0008, 0x00000040); + write32(mmio + 0x000f000c, 0x00022050); + write32(mmio + PIPECONF(0), PIPECONF_BPP_6 | PIPECONF_DITHER_EN); write32(mmio + PIPECONF(0), PIPECONF_ENABLE | PIPECONF_BPP_6 | PIPECONF_DITHER_EN);
- write32(mmio + VGACNTRL, 0x0); - write32(mmio + DSPCNTR(0), DISPLAY_PLANE_ENABLE | DISPPLANE_BGRX888); - mdelay(1); + if (IS_ENABLED(CONFIG_FRAMEBUFFER_KEEP_VESA_MODE)) { + write32(mmio + VGACNTRL, VGA_DISP_DISABLE); + write32(mmio + DSPCNTR(0), DISPLAY_PLANE_ENABLE + | DISPPLANE_BGRX888); + mdelay(1); + } else { + write32(mmio + VGACNTRL, 0xc4008e); + }
write32(mmio + ADPA, ADPA_DAC_ENABLE | ADPA_PIPE_A_SELECT | ADPA_CRT_HOTPLUG_MONITOR_COLOR | ADPA_CRT_HOTPLUG_ENABLE - | ADPA_USE_VGA_HVPOLARITY | ADPA_VSYNC_CNTL_ENABLE | ADPA_HSYNC_CNTL_ENABLE | ADPA_DPMS_ON - ); + | (vpolarity ? 0 : ADPA_VSYNC_ACTIVE_HIGH) + | (hpolarity ? 0 : ADPA_VSYNC_ACTIVE_LOW));
- vga_textmode_init(); + write32(mmio + PP_CONTROL, PANEL_POWER_ON | PANEL_POWER_RESET);
- /* Enable screen memory. */ + /* Enable screen memory. */ vga_sr_write(1, vga_sr_read(1) & ~0x20);
/* Clear interrupts. */ write32(mmio + DEIIR, 0xffffffff); write32(mmio + SDEIIR, 0xffffffff); + + if (IS_ENABLED(CONFIG_FRAMEBUFFER_KEEP_VESA_MODE)) { + memset((void *) lfb, 0, + edid.x_resolution * edid.y_resolution * 4); + set_vbe_mode_info_valid(&edid, lfb); + } + + }
/* compare the header of the vga edid header */ @@ -480,6 +652,7 @@ static u8 vga_connected(u8 *mmio) u8 vga_edid[128]; u8 header[8] = {0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00}; intel_gmbus_read_edid(mmio + GMBUS0, 2, 0x50, vga_edid, 128); + intel_gmbus_stop(mmio + GMBUS0); for (int i = 0; i < 8; i++) { if (vga_edid[i] != header[i]) { printk(BIOS_DEBUG, "VGA not connected. Using LVDS display\n"); @@ -566,7 +739,8 @@ static void gma_func0_init(struct device *dev) "Initializing VGA without OPROM. MMIO 0x%llx\n", gtt_res->base); if (vga_connected(res2mmio(gtt_res, 0, 0))) - gma_init_vga(conf, res2mmio(gtt_res, 0, 0)); + gma_init_vga(conf, res2mmio(gtt_res, 0, 0), + physbase, pio_res->base, lfb_res->base); else gma_init_lvds(conf, res2mmio(gtt_res, 0, 0), physbase, pio_res->base, lfb_res->base);