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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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46fb6f110d
This adds the ability to suspend/resume the gxfb driver, which includes: - The addition of a Graphics Processor register table in gxfb.h, and associated GP handling. - Register and palette saving code; registers are stored in gxfb_par. A few MSR values are saved as well. - gx_powerup and gx_powerdown functions which restore/save registers and enable/disable graphic engines. - gxfb_suspend/gxfb_resume Originally based on a patch by Jordan Crouse. Signed-off-by: Andres Salomon <dilinger@debian.org> Cc: Jordan Crouse <jordan.crouse@amd.com> Cc: "Antonino A. Daplas" <adaplas@pol.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
268 lines
6.1 KiB
C
268 lines
6.1 KiB
C
/*
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* Copyright (C) 2007 Advanced Micro Devices, Inc.
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* Copyright (C) 2008 Andres Salomon <dilinger@debian.org>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*/
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#include <linux/fb.h>
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#include <asm/io.h>
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#include <asm/msr.h>
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#include <asm/geode.h>
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#include <asm/delay.h>
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#include "gxfb.h"
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#ifdef CONFIG_PM
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static void gx_save_regs(struct gxfb_par *par)
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{
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int i;
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/* wait for the BLT engine to stop being busy */
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do {
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i = read_gp(par, GP_BLT_STATUS);
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} while (i & (GP_BLT_STATUS_BLT_PENDING | GP_BLT_STATUS_BLT_BUSY));
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/* save MSRs */
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rdmsrl(MSR_GX_MSR_PADSEL, par->msr.padsel);
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rdmsrl(MSR_GLCP_DOTPLL, par->msr.dotpll);
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write_dc(par, DC_UNLOCK, DC_UNLOCK_UNLOCK);
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/* save registers */
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memcpy(par->gp, par->gp_regs, sizeof(par->gp));
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memcpy(par->dc, par->dc_regs, sizeof(par->dc));
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memcpy(par->vp, par->vid_regs, sizeof(par->vp));
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memcpy(par->fp, par->vid_regs + VP_FP_START, sizeof(par->fp));
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/* save the palette */
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write_dc(par, DC_PAL_ADDRESS, 0);
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for (i = 0; i < ARRAY_SIZE(par->pal); i++)
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par->pal[i] = read_dc(par, DC_PAL_DATA);
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}
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static void gx_set_dotpll(uint32_t dotpll_hi)
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{
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uint32_t dotpll_lo;
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int i;
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rdmsrl(MSR_GLCP_DOTPLL, dotpll_lo);
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dotpll_lo |= MSR_GLCP_DOTPLL_DOTRESET;
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dotpll_lo &= ~MSR_GLCP_DOTPLL_BYPASS;
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wrmsr(MSR_GLCP_DOTPLL, dotpll_lo, dotpll_hi);
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/* wait for the PLL to lock */
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for (i = 0; i < 200; i++) {
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rdmsrl(MSR_GLCP_DOTPLL, dotpll_lo);
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if (dotpll_lo & MSR_GLCP_DOTPLL_LOCK)
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break;
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udelay(1);
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}
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/* PLL set, unlock */
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dotpll_lo &= ~MSR_GLCP_DOTPLL_DOTRESET;
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wrmsr(MSR_GLCP_DOTPLL, dotpll_lo, dotpll_hi);
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}
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static void gx_restore_gfx_proc(struct gxfb_par *par)
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{
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int i;
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for (i = 0; i < ARRAY_SIZE(par->gp); i++) {
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switch (i) {
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case GP_VECTOR_MODE:
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case GP_BLT_MODE:
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case GP_BLT_STATUS:
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case GP_HST_SRC:
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/* don't restore these registers */
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break;
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default:
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write_gp(par, i, par->gp[i]);
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}
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}
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}
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static void gx_restore_display_ctlr(struct gxfb_par *par)
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{
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int i;
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for (i = 0; i < ARRAY_SIZE(par->dc); i++) {
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switch (i) {
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case DC_UNLOCK:
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/* unlock the DC; runs first */
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write_dc(par, DC_UNLOCK, DC_UNLOCK_UNLOCK);
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break;
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case DC_GENERAL_CFG:
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/* write without the enables */
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write_dc(par, i, par->dc[i] & ~(DC_GENERAL_CFG_VIDE |
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DC_GENERAL_CFG_ICNE |
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DC_GENERAL_CFG_CURE |
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DC_GENERAL_CFG_DFLE));
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break;
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case DC_DISPLAY_CFG:
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/* write without the enables */
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write_dc(par, i, par->dc[i] & ~(DC_DISPLAY_CFG_VDEN |
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DC_DISPLAY_CFG_GDEN |
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DC_DISPLAY_CFG_TGEN));
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break;
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case DC_RSVD_0:
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case DC_RSVD_1:
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case DC_RSVD_2:
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case DC_RSVD_3:
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case DC_RSVD_4:
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case DC_LINE_CNT:
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case DC_PAL_ADDRESS:
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case DC_PAL_DATA:
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case DC_DFIFO_DIAG:
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case DC_CFIFO_DIAG:
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case DC_RSVD_5:
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/* don't restore these registers */
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break;
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default:
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write_dc(par, i, par->dc[i]);
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}
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}
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/* restore the palette */
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write_dc(par, DC_PAL_ADDRESS, 0);
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for (i = 0; i < ARRAY_SIZE(par->pal); i++)
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write_dc(par, DC_PAL_DATA, par->pal[i]);
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}
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static void gx_restore_video_proc(struct gxfb_par *par)
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{
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int i;
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wrmsrl(MSR_GX_MSR_PADSEL, par->msr.padsel);
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for (i = 0; i < ARRAY_SIZE(par->vp); i++) {
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switch (i) {
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case VP_VCFG:
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/* don't enable video yet */
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write_vp(par, i, par->vp[i] & ~VP_VCFG_VID_EN);
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break;
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case VP_DCFG:
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/* don't enable CRT yet */
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write_vp(par, i, par->vp[i] &
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~(VP_DCFG_DAC_BL_EN | VP_DCFG_VSYNC_EN |
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VP_DCFG_HSYNC_EN | VP_DCFG_CRT_EN));
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break;
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case VP_GAR:
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case VP_GDR:
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case VP_RSVD_0:
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case VP_RSVD_1:
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case VP_RSVD_2:
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case VP_RSVD_3:
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case VP_CRC32:
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case VP_AWT:
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case VP_VTM:
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/* don't restore these registers */
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break;
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default:
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write_vp(par, i, par->vp[i]);
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}
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}
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}
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static void gx_restore_regs(struct gxfb_par *par)
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{
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int i;
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gx_set_dotpll((uint32_t) (par->msr.dotpll >> 32));
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gx_restore_gfx_proc(par);
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gx_restore_display_ctlr(par);
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gx_restore_video_proc(par);
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/* Flat Panel */
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for (i = 0; i < ARRAY_SIZE(par->fp); i++) {
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if (i != FP_PM && i != FP_RSVD_0)
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write_fp(par, i, par->fp[i]);
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}
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}
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static void gx_disable_graphics(struct gxfb_par *par)
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{
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/* shut down the engine */
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write_vp(par, VP_VCFG, par->vp[VP_VCFG] & ~VP_VCFG_VID_EN);
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write_vp(par, VP_DCFG, par->vp[VP_DCFG] & ~(VP_DCFG_DAC_BL_EN |
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VP_DCFG_VSYNC_EN | VP_DCFG_HSYNC_EN | VP_DCFG_CRT_EN));
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/* turn off the flat panel */
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write_fp(par, FP_PM, par->fp[FP_PM] & ~FP_PM_P);
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/* turn off display */
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write_dc(par, DC_UNLOCK, DC_UNLOCK_UNLOCK);
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write_dc(par, DC_GENERAL_CFG, par->dc[DC_GENERAL_CFG] &
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~(DC_GENERAL_CFG_VIDE | DC_GENERAL_CFG_ICNE |
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DC_GENERAL_CFG_CURE | DC_GENERAL_CFG_DFLE));
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write_dc(par, DC_DISPLAY_CFG, par->dc[DC_DISPLAY_CFG] &
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~(DC_DISPLAY_CFG_VDEN | DC_DISPLAY_CFG_GDEN |
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DC_DISPLAY_CFG_TGEN));
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write_dc(par, DC_UNLOCK, DC_UNLOCK_LOCK);
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}
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static void gx_enable_graphics(struct gxfb_par *par)
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{
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uint32_t fp;
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fp = read_fp(par, FP_PM);
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if (par->fp[FP_PM] & FP_PM_P) {
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/* power on the panel if not already power{ed,ing} on */
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if (!(fp & (FP_PM_PANEL_ON|FP_PM_PANEL_PWR_UP)))
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write_fp(par, FP_PM, par->fp[FP_PM]);
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} else {
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/* power down the panel if not already power{ed,ing} down */
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if (!(fp & (FP_PM_PANEL_OFF|FP_PM_PANEL_PWR_DOWN)))
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write_fp(par, FP_PM, par->fp[FP_PM]);
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}
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/* turn everything on */
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write_vp(par, VP_VCFG, par->vp[VP_VCFG]);
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write_vp(par, VP_DCFG, par->vp[VP_DCFG]);
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write_dc(par, DC_DISPLAY_CFG, par->dc[DC_DISPLAY_CFG]);
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/* do this last; it will enable the FIFO load */
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write_dc(par, DC_GENERAL_CFG, par->dc[DC_GENERAL_CFG]);
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/* lock the door behind us */
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write_dc(par, DC_UNLOCK, DC_UNLOCK_LOCK);
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}
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int gx_powerdown(struct fb_info *info)
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{
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struct gxfb_par *par = info->par;
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if (par->powered_down)
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return 0;
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gx_save_regs(par);
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gx_disable_graphics(par);
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par->powered_down = 1;
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return 0;
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}
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int gx_powerup(struct fb_info *info)
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{
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struct gxfb_par *par = info->par;
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if (!par->powered_down)
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return 0;
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gx_restore_regs(par);
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gx_enable_graphics(par);
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par->powered_down = 0;
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return 0;
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}
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#endif
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