129 lines
3.6 KiB
C
129 lines
3.6 KiB
C
// SPDX-License-Identifier: MIT
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/*
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* Copyright © 2019 Intel Corporation
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*/
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#include <linux/delay.h>
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#include <linux/vgaarb.h>
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#include <video/vga.h>
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#include "soc/intel_gmch.h"
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#include "i915_drv.h"
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#include "i915_reg.h"
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#include "intel_de.h"
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#include "intel_vga.h"
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static i915_reg_t intel_vga_cntrl_reg(struct intel_display *display)
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{
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if (display->platform.valleyview || display->platform.cherryview)
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return VLV_VGACNTRL;
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else if (DISPLAY_VER(display) >= 5)
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return CPU_VGACNTRL;
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else
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return VGACNTRL;
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}
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/* Disable the VGA plane that we never use */
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void intel_vga_disable(struct intel_display *display)
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{
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struct pci_dev *pdev = to_pci_dev(display->drm->dev);
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i915_reg_t vga_reg = intel_vga_cntrl_reg(display);
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u8 sr1;
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if (intel_de_read(display, vga_reg) & VGA_DISP_DISABLE)
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return;
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/* WaEnableVGAAccessThroughIOPort:ctg,elk,ilk,snb,ivb,vlv,hsw */
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vga_get_uninterruptible(pdev, VGA_RSRC_LEGACY_IO);
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outb(0x01, VGA_SEQ_I);
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sr1 = inb(VGA_SEQ_D);
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outb(sr1 | VGA_SR01_SCREEN_OFF, VGA_SEQ_D);
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vga_put(pdev, VGA_RSRC_LEGACY_IO);
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udelay(300);
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intel_de_write(display, vga_reg, VGA_DISP_DISABLE);
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intel_de_posting_read(display, vga_reg);
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}
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void intel_vga_redisable_power_on(struct intel_display *display)
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{
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i915_reg_t vga_reg = intel_vga_cntrl_reg(display);
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if (!(intel_de_read(display, vga_reg) & VGA_DISP_DISABLE)) {
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drm_dbg_kms(display->drm,
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"Something enabled VGA plane, disabling it\n");
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intel_vga_disable(display);
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}
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}
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void intel_vga_redisable(struct intel_display *display)
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{
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struct drm_i915_private *i915 = to_i915(display->drm);
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intel_wakeref_t wakeref;
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/*
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* This function can be called both from intel_modeset_setup_hw_state or
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* at a very early point in our resume sequence, where the power well
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* structures are not yet restored. Since this function is at a very
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* paranoid "someone might have enabled VGA while we were not looking"
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* level, just check if the power well is enabled instead of trying to
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* follow the "don't touch the power well if we don't need it" policy
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* the rest of the driver uses.
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*/
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wakeref = intel_display_power_get_if_enabled(i915, POWER_DOMAIN_VGA);
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if (!wakeref)
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return;
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intel_vga_redisable_power_on(display);
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intel_display_power_put(i915, POWER_DOMAIN_VGA, wakeref);
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}
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void intel_vga_reset_io_mem(struct intel_display *display)
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{
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struct pci_dev *pdev = to_pci_dev(display->drm->dev);
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/*
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* After we re-enable the power well, if we touch VGA register 0x3d5
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* we'll get unclaimed register interrupts. This stops after we write
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* anything to the VGA MSR register. The vgacon module uses this
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* register all the time, so if we unbind our driver and, as a
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* consequence, bind vgacon, we'll get stuck in an infinite loop at
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* console_unlock(). So make here we touch the VGA MSR register, making
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* sure vgacon can keep working normally without triggering interrupts
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* and error messages.
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*/
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vga_get_uninterruptible(pdev, VGA_RSRC_LEGACY_IO);
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outb(inb(VGA_MIS_R), VGA_MIS_W);
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vga_put(pdev, VGA_RSRC_LEGACY_IO);
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}
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int intel_vga_register(struct intel_display *display)
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{
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struct pci_dev *pdev = to_pci_dev(display->drm->dev);
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int ret;
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/*
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* If we have > 1 VGA cards, then we need to arbitrate access to the
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* common VGA resources.
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*
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* If we are a secondary display controller (!PCI_DISPLAY_CLASS_VGA),
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* then we do not take part in VGA arbitration and the
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* vga_client_register() fails with -ENODEV.
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*/
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ret = vga_client_register(pdev, intel_gmch_vga_set_decode);
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if (ret && ret != -ENODEV)
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return ret;
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return 0;
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}
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void intel_vga_unregister(struct intel_display *display)
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{
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struct pci_dev *pdev = to_pci_dev(display->drm->dev);
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vga_client_unregister(pdev);
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}
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