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250e743915
On bochs DRM driver, the execution of "setterm --blank force" results in a frozen screen instead of a blank screen. It's due to the lack of the screen blanking support in its code. Actually, the QEMU bochs vga side can switch to the blanking mode when the bit 0x20 is cleared on VGA_ATT_IW register (0x3c0), which updates ar_index in QEMU side. So, essentially, we'd just need to clear the bit at pipe disable callback; that's what this patch does essentially. However, a tricky part is that the access via VGA_ATT_IW is done in "flip-flop"; the first write is for index and the second write is for the data like palette. Meanwhile, in the current bochs DRM driver, the flip-flop wasn't considered, and it calls only the register update once with the value 0x20. The spec and the actual VGA implementation in QEMU suggests that the flip flop flag is discarded by reading the CRTC index register (VGA_IS1_RC, 0x3da). So, in this patch, we add the helper to read a byte and the call to clear the flip flop flag before changing the blank / unblank setup via VGA_ATT_IW register. v1->v2: * discard ar_flip_flop by reading 0x3da, add bochs_vga_readb() * include video/vga.h for VGA register definitions * move the blank/unblank code to bochs_hw_blank() Signed-off-by: Takashi Iwai <tiwai@suse.de> Acked-by: Gerd Hoffmann <kraxel@redhat.com> Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de> Link: https://patchwork.freedesktop.org/patch/msgid/20210421080859.14869-1-tiwai@suse.de
99 lines
2.8 KiB
C
99 lines
2.8 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#include <linux/io.h>
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#include <linux/console.h>
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#include <drm/drm_crtc.h>
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#include <drm/drm_crtc_helper.h>
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#include <drm/drm_encoder.h>
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#include <drm/drm_fb_helper.h>
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#include <drm/drm_gem.h>
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#include <drm/drm_gem_vram_helper.h>
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#include <drm/drm_simple_kms_helper.h>
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/* ---------------------------------------------------------------------- */
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#define VBE_DISPI_IOPORT_INDEX 0x01CE
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#define VBE_DISPI_IOPORT_DATA 0x01CF
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#define VBE_DISPI_INDEX_ID 0x0
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#define VBE_DISPI_INDEX_XRES 0x1
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#define VBE_DISPI_INDEX_YRES 0x2
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#define VBE_DISPI_INDEX_BPP 0x3
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#define VBE_DISPI_INDEX_ENABLE 0x4
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#define VBE_DISPI_INDEX_BANK 0x5
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#define VBE_DISPI_INDEX_VIRT_WIDTH 0x6
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#define VBE_DISPI_INDEX_VIRT_HEIGHT 0x7
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#define VBE_DISPI_INDEX_X_OFFSET 0x8
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#define VBE_DISPI_INDEX_Y_OFFSET 0x9
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#define VBE_DISPI_INDEX_VIDEO_MEMORY_64K 0xa
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#define VBE_DISPI_ID0 0xB0C0
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#define VBE_DISPI_ID1 0xB0C1
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#define VBE_DISPI_ID2 0xB0C2
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#define VBE_DISPI_ID3 0xB0C3
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#define VBE_DISPI_ID4 0xB0C4
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#define VBE_DISPI_ID5 0xB0C5
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#define VBE_DISPI_DISABLED 0x00
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#define VBE_DISPI_ENABLED 0x01
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#define VBE_DISPI_GETCAPS 0x02
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#define VBE_DISPI_8BIT_DAC 0x20
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#define VBE_DISPI_LFB_ENABLED 0x40
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#define VBE_DISPI_NOCLEARMEM 0x80
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/* ---------------------------------------------------------------------- */
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enum bochs_types {
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BOCHS_QEMU_STDVGA,
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BOCHS_UNKNOWN,
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};
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struct bochs_device {
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/* hw */
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void __iomem *mmio;
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int ioports;
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void __iomem *fb_map;
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unsigned long fb_base;
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unsigned long fb_size;
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unsigned long qext_size;
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/* mode */
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u16 xres;
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u16 yres;
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u16 yres_virtual;
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u32 stride;
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u32 bpp;
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struct edid *edid;
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/* drm */
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struct drm_device *dev;
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struct drm_simple_display_pipe pipe;
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struct drm_connector connector;
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};
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/* ---------------------------------------------------------------------- */
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/* bochs_hw.c */
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int bochs_hw_init(struct drm_device *dev);
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void bochs_hw_fini(struct drm_device *dev);
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void bochs_hw_blank(struct bochs_device *bochs, bool blank);
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void bochs_hw_setmode(struct bochs_device *bochs,
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struct drm_display_mode *mode);
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void bochs_hw_setformat(struct bochs_device *bochs,
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const struct drm_format_info *format);
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void bochs_hw_setbase(struct bochs_device *bochs,
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int x, int y, int stride, u64 addr);
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int bochs_hw_load_edid(struct bochs_device *bochs);
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/* bochs_mm.c */
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int bochs_mm_init(struct bochs_device *bochs);
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void bochs_mm_fini(struct bochs_device *bochs);
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/* bochs_kms.c */
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int bochs_kms_init(struct bochs_device *bochs);
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/* bochs_fbdev.c */
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extern const struct drm_mode_config_funcs bochs_mode_funcs;
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