From 3edc6e2d440803dfe22288c3ea7d77b4ab934ec8 Mon Sep 17 00:00:00 2001 From: Mateusz Kwiatkowski Date: Thu, 15 Jul 2021 01:07:30 +0200 Subject: [PATCH] drm/vc4: Fix timings for VEC modes This commit fixes vertical timings of the VEC (composite output) modes to accurately represent the 525-line ("NTSC") and 625-line ("PAL") ITU-R standards. Previous timings were actually defined as 502 and 601 lines, resulting in non-standard 62.69 Hz and 52 Hz signals being generated, respectively. Changes to vc4_crtc.c have also been made, to make the PixelValve vertical timings accurately correspond to the DRM modeline in interlaced modes. The resulting VERTA/VERTB register values have been verified against the reference values set by the Raspberry Pi firmware. Signed-off-by: Mateusz Kwiatkowski --- drivers/gpu/drm/vc4/vc4_crtc.c | 70 +++++++++++++++++++++------------- drivers/gpu/drm/vc4/vc4_vec.c | 4 +- 2 files changed, 45 insertions(+), 29 deletions(-) --- a/drivers/gpu/drm/vc4/vc4_crtc.c +++ b/drivers/gpu/drm/vc4/vc4_crtc.c @@ -318,8 +318,14 @@ static void vc4_crtc_config_pv(struct dr bool is_dsi = (vc4_encoder->type == VC4_ENCODER_TYPE_DSI0 || vc4_encoder->type == VC4_ENCODER_TYPE_DSI1); bool is_dsi1 = vc4_encoder->type == VC4_ENCODER_TYPE_DSI1; + bool is_vec = vc4_encoder->type == VC4_ENCODER_TYPE_VEC; u32 format = is_dsi1 ? PV_CONTROL_FORMAT_DSIV_24 : PV_CONTROL_FORMAT_24; u8 ppc = pv_data->pixels_per_clock; + + u16 vert_bp = mode->crtc_vtotal - mode->crtc_vsync_end; + u16 vert_sync = mode->crtc_vsync_end - mode->crtc_vsync_start; + u16 vert_fp = mode->crtc_vsync_start - mode->crtc_vdisplay; + bool debug_dump_regs = false; if (debug_dump_regs) { @@ -343,49 +349,59 @@ static void vc4_crtc_config_pv(struct dr VC4_SET_FIELD(mode->hdisplay * pixel_rep / ppc, PV_HORZB_HACTIVE)); - CRTC_WRITE(PV_VERTA, - VC4_SET_FIELD(mode->crtc_vtotal - mode->crtc_vsync_end + - interlace, - PV_VERTA_VBP) | - VC4_SET_FIELD(mode->crtc_vsync_end - mode->crtc_vsync_start, - PV_VERTA_VSYNC)); - CRTC_WRITE(PV_VERTB, - VC4_SET_FIELD(mode->crtc_vsync_start - mode->crtc_vdisplay, - PV_VERTB_VFP) | - VC4_SET_FIELD(mode->crtc_vdisplay, PV_VERTB_VACTIVE)); - if (interlace) { + bool odd_field_first = false; + u32 field_delay = mode->htotal * pixel_rep / (2 * ppc); + u16 vert_bp_even = vert_bp; + u16 vert_fp_even = vert_fp; + + if (is_vec) { + /* VEC (composite output) */ + ++field_delay; + if (mode->htotal == 858) { + /* 525-line mode (NTSC or PAL-M) */ + odd_field_first = true; + } + } + + if (odd_field_first) + ++vert_fp_even; + else + ++vert_bp; + CRTC_WRITE(PV_VERTA_EVEN, - VC4_SET_FIELD(mode->crtc_vtotal - - mode->crtc_vsync_end, - PV_VERTA_VBP) | - VC4_SET_FIELD(mode->crtc_vsync_end - - mode->crtc_vsync_start, - PV_VERTA_VSYNC)); + VC4_SET_FIELD(vert_bp_even, PV_VERTA_VBP) | + VC4_SET_FIELD(vert_sync, PV_VERTA_VSYNC)); CRTC_WRITE(PV_VERTB_EVEN, - VC4_SET_FIELD(mode->crtc_vsync_start - - mode->crtc_vdisplay, - PV_VERTB_VFP) | + VC4_SET_FIELD(vert_fp_even, PV_VERTB_VFP) | VC4_SET_FIELD(mode->crtc_vdisplay, PV_VERTB_VACTIVE)); - /* We set up first field even mode for HDMI. VEC's - * NTSC mode would want first field odd instead, once - * we support it (to do so, set ODD_FIRST and put the - * delay in VSYNCD_EVEN instead). + /* We set up first field even mode for HDMI and VEC's PAL. + * For NTSC, we need first field odd. */ CRTC_WRITE(PV_V_CONTROL, PV_VCONTROL_CONTINUOUS | (is_dsi ? PV_VCONTROL_DSI : 0) | PV_VCONTROL_INTERLACE | - VC4_SET_FIELD(mode->htotal * pixel_rep / (2 * ppc), - PV_VCONTROL_ODD_DELAY)); - CRTC_WRITE(PV_VSYNCD_EVEN, 0); + (odd_field_first + ? PV_VCONTROL_ODD_FIRST + : VC4_SET_FIELD(field_delay, + PV_VCONTROL_ODD_DELAY))); + CRTC_WRITE(PV_VSYNCD_EVEN, + (odd_field_first ? field_delay : 0)); } else { CRTC_WRITE(PV_V_CONTROL, PV_VCONTROL_CONTINUOUS | (is_dsi ? PV_VCONTROL_DSI : 0)); } + CRTC_WRITE(PV_VERTA, + VC4_SET_FIELD(vert_bp, PV_VERTA_VBP) | + VC4_SET_FIELD(vert_sync, PV_VERTA_VSYNC)); + CRTC_WRITE(PV_VERTB, + VC4_SET_FIELD(vert_fp, PV_VERTB_VFP) | + VC4_SET_FIELD(mode->crtc_vdisplay, PV_VERTB_VACTIVE)); + if (is_dsi) CRTC_WRITE(PV_HACT_ACT, mode->hdisplay * pixel_rep); --- a/drivers/gpu/drm/vc4/vc4_vec.c +++ b/drivers/gpu/drm/vc4/vc4_vec.c @@ -256,7 +256,7 @@ static void vc4_vec_ntsc_j_mode_set(stru static const struct drm_display_mode ntsc_mode = { DRM_MODE("720x480", DRM_MODE_TYPE_DRIVER, 13500, 720, 720 + 14, 720 + 14 + 64, 720 + 14 + 64 + 60, 0, - 480, 480 + 3, 480 + 3 + 3, 480 + 3 + 3 + 16, 0, + 480, 480 + 7, 480 + 7 + 6, 525, 0, DRM_MODE_FLAG_INTERLACE) }; @@ -278,7 +278,7 @@ static void vc4_vec_pal_m_mode_set(struc static const struct drm_display_mode pal_mode = { DRM_MODE("720x576", DRM_MODE_TYPE_DRIVER, 13500, 720, 720 + 20, 720 + 20 + 64, 720 + 20 + 64 + 60, 0, - 576, 576 + 2, 576 + 2 + 3, 576 + 2 + 3 + 20, 0, + 576, 576 + 4, 576 + 4 + 6, 625, 0, DRM_MODE_FLAG_INTERLACE) };