From: Mario Kleiner mario.kleiner@tuebingen.mpg.de

radeon_get_crtc_scanoutpos() returns the current horizontal and vertical scanout position of a crtc. It also reports if the display scanout is currently inside the vblank area.

hpos reports current horizontal pixel scanout position. vpos reports the current scanned out line as a value >= 0 in active scanout. If the scanout is inside vblank area, it reports a negative value, the number of scanlines until end of vblank aka start of active scanout, e.g., -3 == "At most 3 scanlines until end of vblank".

This code is derived from radeon_pm_in_vbl(), tested on R500 and R600.

Signed-off-by: Mario Kleiner mario.kleiner@tuebingen.mpg.de Signed-off-by: Alex Deucher alexdeucher@gmail.com --- drivers/gpu/drm/radeon/radeon_display.c | 153 +++++++++++++++++++++++++++++++ drivers/gpu/drm/radeon/radeon_mode.h | 7 ++ 2 files changed, 160 insertions(+), 0 deletions(-)

diff --git a/drivers/gpu/drm/radeon/radeon_display.c b/drivers/gpu/drm/radeon/radeon_display.c index b418285..a7963df 100644 --- a/drivers/gpu/drm/radeon/radeon_display.c +++ b/drivers/gpu/drm/radeon/radeon_display.c @@ -964,3 +964,156 @@ bool radeon_crtc_scaling_mode_fixup(struct drm_crtc *crtc, } return true; } + +/* + * Retrieve current video scanout position of crtc on a given gpu. + * + * \param rdev Device to query. + * \param crtc Crtc to query. + * \param *vpos Location where vertical scanout position should be stored. + * \param *hpos Location where horizontal scanout position should go. + * + * Returns vpos as a positive number while in active scanout area. + * Returns vpos as a negative number inside vblank, counting the number + * of scanlines to go until end of vblank, e.g., -1 means "one scanline + * until start of active scanout / end of vblank." + * + * \return Flags, or'ed together as follows: + * + * RADEON_SCANOUTPOS_VALID = Query successfull. + * RADEON_SCANOUTPOS_INVBL = Inside vblank. + * RADEON_SCANOUTPOS_ACCURATE = Returned position is accurate. A lack of + * this flag means that returned position may be offset by a constant but + * unknown small number of scanlines wrt. real scanout position. + * + */ +int radeon_get_crtc_scanoutpos(struct radeon_device *rdev, int crtc, int *vpos, int *hpos) +{ + u32 stat_crtc = 0, vbl = 0, position = 0; + int vbl_start, vbl_end, vtotal, ret = 0; + bool in_vbl = true; + + if (ASIC_IS_DCE4(rdev)) { + if (crtc == 0) { + vbl = RREG32(EVERGREEN_CRTC_V_BLANK_START_END + + EVERGREEN_CRTC0_REGISTER_OFFSET); + position = RREG32(EVERGREEN_CRTC_STATUS_POSITION + + EVERGREEN_CRTC0_REGISTER_OFFSET); + ret |= RADEON_SCANOUTPOS_VALID; + } + if (crtc == 1) { + vbl = RREG32(EVERGREEN_CRTC_V_BLANK_START_END + + EVERGREEN_CRTC1_REGISTER_OFFSET); + position = RREG32(EVERGREEN_CRTC_STATUS_POSITION + + EVERGREEN_CRTC1_REGISTER_OFFSET); + ret |= RADEON_SCANOUTPOS_VALID; + } + if (crtc == 2) { + vbl = RREG32(EVERGREEN_CRTC_V_BLANK_START_END + + EVERGREEN_CRTC2_REGISTER_OFFSET); + position = RREG32(EVERGREEN_CRTC_STATUS_POSITION + + EVERGREEN_CRTC2_REGISTER_OFFSET); + ret |= RADEON_SCANOUTPOS_VALID; + } + if (crtc == 3) { + vbl = RREG32(EVERGREEN_CRTC_V_BLANK_START_END + + EVERGREEN_CRTC3_REGISTER_OFFSET); + position = RREG32(EVERGREEN_CRTC_STATUS_POSITION + + EVERGREEN_CRTC3_REGISTER_OFFSET); + ret |= RADEON_SCANOUTPOS_VALID; + } + if (crtc == 4) { + vbl = RREG32(EVERGREEN_CRTC_V_BLANK_START_END + + EVERGREEN_CRTC4_REGISTER_OFFSET); + position = RREG32(EVERGREEN_CRTC_STATUS_POSITION + + EVERGREEN_CRTC4_REGISTER_OFFSET); + ret |= RADEON_SCANOUTPOS_VALID; + } + if (crtc == 5) { + vbl = RREG32(EVERGREEN_CRTC_V_BLANK_START_END + + EVERGREEN_CRTC5_REGISTER_OFFSET); + position = RREG32(EVERGREEN_CRTC_STATUS_POSITION + + EVERGREEN_CRTC5_REGISTER_OFFSET); + ret |= RADEON_SCANOUTPOS_VALID; + } + } else if (ASIC_IS_AVIVO(rdev)) { + if (crtc == 0) { + vbl = RREG32(AVIVO_D1CRTC_V_BLANK_START_END); + position = RREG32(AVIVO_D1CRTC_STATUS_POSITION); + ret |= RADEON_SCANOUTPOS_VALID; + } + if (crtc == 1) { + vbl = RREG32(AVIVO_D2CRTC_V_BLANK_START_END); + position = RREG32(AVIVO_D2CRTC_STATUS_POSITION); + ret |= RADEON_SCANOUTPOS_VALID; + } + } else { + /* Pre-AVIVO: Different encoding of scanout pos and vblank interval. */ + if (crtc == 0) { + /* Assume vbl_end == 0, get vbl_start from + * upper 16 bits. + */ + vbl = (RREG32(RADEON_CRTC_V_TOTAL_DISP) & + RADEON_CRTC_V_DISP) >> RADEON_CRTC_V_DISP_SHIFT; + /* Only retrieve vpos from upper 16 bits, set hpos == 0. */ + position = (RREG32(RADEON_CRTC_VLINE_CRNT_VLINE) >> 16) & RADEON_CRTC_V_TOTAL; + stat_crtc = RREG32(RADEON_CRTC_STATUS); + if (!(stat_crtc & 1)) + in_vbl = false; + + ret |= RADEON_SCANOUTPOS_VALID; + } + if (crtc == 1) { + vbl = (RREG32(RADEON_CRTC2_V_TOTAL_DISP) & + RADEON_CRTC_V_DISP) >> RADEON_CRTC_V_DISP_SHIFT; + position = (RREG32(RADEON_CRTC2_VLINE_CRNT_VLINE) >> 16) & RADEON_CRTC_V_TOTAL; + stat_crtc = RREG32(RADEON_CRTC2_STATUS); + if (!(stat_crtc & 1)) + in_vbl = false; + + ret |= RADEON_SCANOUTPOS_VALID; + } + } + + /* Decode into vertical and horizontal scanout position. */ + *vpos = position & 0x1fff; + *hpos = (position >> 16) & 0x1fff; + + /* Valid vblank area boundaries from gpu retrieved? */ + if (vbl > 0) { + /* Yes: Decode. */ + ret |= RADEON_SCANOUTPOS_ACCURATE; + vbl_start = vbl & 0x1fff; + vbl_end = (vbl >> 16) & 0x1fff; + } + else { + /* No: Fake something reasonable which gives at least ok results. */ + vbl_start = rdev->mode_info.crtcs[crtc]->base.mode.crtc_vdisplay; + vbl_end = 0; + } + + /* Test scanout position against vblank region. */ + if ((*vpos < vbl_start) && (*vpos >= vbl_end)) + in_vbl = false; + + /* Check if inside vblank area and apply corrective offsets: + * vpos will then be >=0 in video scanout area, but negative + * within vblank area, counting down the number of lines until + * start of scanout. + */ + + /* Inside "upper part" of vblank area? Apply corrective offset if so: */ + if (in_vbl && (*vpos >= vbl_start)) { + vtotal = rdev->mode_info.crtcs[crtc]->base.mode.crtc_vtotal; + *vpos = *vpos - vtotal; + } + + /* Correct for shifted end of vbl at vbl_end. */ + *vpos = *vpos - vbl_end; + + /* In vblank? */ + if (in_vbl) + ret |= RADEON_SCANOUTPOS_INVBL; + + return ret; +} diff --git a/drivers/gpu/drm/radeon/radeon_mode.h b/drivers/gpu/drm/radeon/radeon_mode.h index a13a5c7..79a57a7 100644 --- a/drivers/gpu/drm/radeon/radeon_mode.h +++ b/drivers/gpu/drm/radeon/radeon_mode.h @@ -424,6 +424,11 @@ struct radeon_framebuffer { struct drm_gem_object *obj; };

+/* radeon_get_crtc_scanoutpos() return flags */ +#define RADEON_SCANOUTPOS_VALID (1 << 0) +#define RADEON_SCANOUTPOS_INVBL (1 << 1) +#define RADEON_SCANOUTPOS_ACCURATE (1 << 2) + extern enum radeon_tv_std radeon_combios_get_tv_info(struct radeon_device *rdev); extern enum radeon_tv_std @@ -527,6 +532,8 @@ extern int radeon_crtc_cursor_set(struct drm_crtc *crtc, extern int radeon_crtc_cursor_move(struct drm_crtc *crtc, int x, int y);

+extern int radeon_get_crtc_scanoutpos(struct radeon_device *rdev, int crtc, int *vpos, int *hpos); + extern bool radeon_combios_check_hardcoded_edid(struct radeon_device *rdev); extern struct edid * radeon_combios_get_hardcoded_edid(struct radeon_device *rdev);