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drm/ast: Add reduced blanking modes for wide screen mode

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Signed-off-by: Egbert Eich <eich@suse.com>
Tested-by: Steven You2 Liang <liangyou2@lenovo.com>
Signed-off-by: Y.C. Chen <yc_chen@aspeedtech.com>

v3: based on [PATCH 1/2] drm/ast: Add missing entry to dclk_table[].
    Add reduced blanking modes, improve mode matching to
    identify these modes by thier sync polarities.

[airlied: argh whitespace damage]
Signed-off-by: Dave Airlie <airlied@redhat.com>
This commit is contained in:
Y.C. Chen 2014-08-28 17:11:04 +08:00 • committed by Dave Airlie
parent b2efb3f0a1
commit 94d12b137c
2 changed files with 56 additions and 24 deletions
Download patch file Download diff file Expand all files Collapse all files

42
drivers/gpu/drm/ast/ast_mode.c
View file

@ -80,6 +80,8 @@ static bool ast_get_vbios_mode_info(struct drm_crtc *crtc, struct drm_display_mo
struct ast_private *ast = crtc->dev->dev_private;
u32 refresh_rate_index = 0, mode_id, color_index, refresh_rate;
u32 hborder, vborder;
bool check_sync;
struct ast_vbios_enhtable *best = NULL;
switch (crtc->primary->fb->bits_per_pixel) {
case 8:
@ -141,14 +143,34 @@ static bool ast_get_vbios_mode_info(struct drm_crtc *crtc, struct drm_display_mo
}
refresh_rate = drm_mode_vrefresh(mode);
while (vbios_mode->enh_table->refresh_rate < refresh_rate) {
vbios_mode->enh_table++;
if ((vbios_mode->enh_table->refresh_rate > refresh_rate) ||
(vbios_mode->enh_table->refresh_rate == 0xff)) {
vbios_mode->enh_table--;
break;
check_sync = vbios_mode->enh_table->flags & WideScreenMode;
do {
struct ast_vbios_enhtable *loop = vbios_mode->enh_table;
while (loop->refresh_rate != 0xff) {
if ((check_sync) &&
(((mode->flags & DRM_MODE_FLAG_NVSYNC) &&
(loop->flags & PVSync)) ||
((mode->flags & DRM_MODE_FLAG_PVSYNC) &&
(loop->flags & NVSync)) ||
((mode->flags & DRM_MODE_FLAG_NHSYNC) &&
(loop->flags & PHSync)) ||
((mode->flags & DRM_MODE_FLAG_PHSYNC) &&
(loop->flags & NHSync)))) {
loop++;
continue;
}
if (loop->refresh_rate <= refresh_rate
&& (!best || loop->refresh_rate > best->refresh_rate))
best = loop;
loop++;
}
}
if (best || !check_sync)
break;
check_sync = 0;
} while (1);
if (best)
vbios_mode->enh_table = best;
hborder = (vbios_mode->enh_table->flags & HBorder) ? 8 : 0;
vborder = (vbios_mode->enh_table->flags & VBorder) ? 8 : 0;
@ -419,8 +441,10 @@ static void ast_set_sync_reg(struct drm_device *dev, struct drm_display_mode *mo
struct ast_private *ast = dev->dev_private;
u8 jreg;
jreg = ast_io_read8(ast, AST_IO_MISC_PORT_READ);
jreg |= (vbios_mode->enh_table->flags & SyncNN);
jreg = ast_io_read8(ast, AST_IO_MISC_PORT_READ);
jreg &= ~0xC0;
if (vbios_mode->enh_table->flags & NVSync) jreg |= 0x80;
if (vbios_mode->enh_table->flags & NHSync) jreg |= 0x40;
ast_io_write8(ast, AST_IO_MISC_PORT_WRITE, jreg);
}