126 lines
3.4 KiB
C
126 lines
3.4 KiB
C
/*
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epdc-init-auto.c
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Initializes the EPDC framebuffer into a deferred-IO automatic-update
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mode
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Parabola-rM is a free operating system for the reMarakble tablet.
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Copyright (C) 2020 Davis Remmel
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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#include <sys/ioctl.h>
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#include <linux/fb.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <sys/mman.h>
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#include <linux/mxcfb.h>
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#include <stdio.h>
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int main()
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{
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int ret;
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int fb = open("/dev/fb0", O_RDWR);
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struct fb_var_screeninfo vinfo;
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ret = ioctl(fb, FBIOGET_VSCREENINFO, &vinfo);
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if (0 != ret) {
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fprintf(stderr, "FBIOGET_VSCREENINFO failed with error "
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"%d, aborting\n", ret);
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return 1;
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}
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vinfo.xres = 1872;
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vinfo.yres = 1404;
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vinfo.pixclock = 160000000;
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vinfo.left_margin = 32;
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vinfo.right_margin = 326;
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vinfo.upper_margin = 4;
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vinfo.lower_margin = 12;
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vinfo.hsync_len = 44;
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vinfo.vsync_len = 1;
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vinfo.sync = 0;
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vinfo.vmode = FB_VMODE_NONINTERLACED;
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vinfo.accel_flags = 0;
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vinfo.activate = FB_ACTIVATE_FORCE;
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// Put screen info. Sometimes this fails when trying to set the
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// pixclock. This may be a bug in the driver's arithmetic.
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ret = ioctl(fb, FBIOPUT_VSCREENINFO, &vinfo);
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if (0 != ret) {
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fprintf(stderr, "FBIOPUT_VSCREENINFO failed with error "
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"%d, attempting to reset pixclock\n", ret);
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vinfo.pixclock = 6250;
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ioctl(fb, FBIOPUT_VSCREENINFO, &vinfo);
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vinfo.pixclock = 160000000;
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ret = ioctl(fb, FBIOPUT_VSCREENINFO, &vinfo);
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if (0 != ret) {
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fprintf(stderr, "FBIOPUT_VSCREENINFO failed "
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"with error %d, aborting\n", ret);
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return 1;
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}
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}
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// Pull the screeninfo agian
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ret = ioctl(fb, FBIOGET_VSCREENINFO, &vinfo);
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if (0 != ret) {
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fprintf(stderr, "FBIOGET_VSCREENINFO failed with error "
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"%d, aborting\n", ret);
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return 1;
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}
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printf("x:%d y:%d activate:%d bpp:%d rotate:%d hsync_len:%d"
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"vsync_len: %d sync:%d\n",
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vinfo.xres, vinfo.yres, vinfo.activate,
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vinfo.bits_per_pixel, vinfo.rotate, vinfo.hsync_len,
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vinfo.vsync_len, vinfo.sync);
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struct fb_fix_screeninfo finfo;
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ret = ioctl(fb, FBIOGET_FSCREENINFO, &finfo);
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if (0 != ret) {
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fprintf(stderr, "FBIOGET_FSCREENINFO failed with error "
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"%d, aborting\n", ret);
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return 1;
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}
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// In case the EPDC wasn't accessible
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ret = ioctl(fb, MXCFB_ENABLE_EPDC_ACCESS);
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if (0 != ret) {
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fprintf(stderr, "MXCFB_ENABLE_EPDC_ACCESS failed with "
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"error %d, aborting\n", ret);
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return 1;
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}
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// Set auto update mode
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__u32 aumode = AUTO_UPDATE_MODE_AUTOMATIC_MODE;
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ret = ioctl(fb, MXCFB_SET_AUTO_UPDATE_MODE, &aumode);
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if (0 != ret) {
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fprintf(stderr, "MXCFB_SET_AUTO_UPDATE_MODE failed "
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"with error %d, aborting\n", ret);
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return 1;
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}
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// Queue-and-merge is best-performing
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__u32 uscheme = UPDATE_SCHEME_QUEUE_AND_MERGE;
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ret = ioctl(fb, MXCFB_SET_UPDATE_SCHEME, &uscheme);
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if (0 != ret) {
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fprintf(stderr, "MXCFB_SET_UPDATE_SCHEME failed with "
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"error %d, aborting\n", ret);
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return 1;
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}
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close(fb);
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return 0;
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}
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