diff options
Diffstat (limited to 'drivers/gpu/drm/mcde/mcde_display.c')
| -rw-r--r-- | drivers/gpu/drm/mcde/mcde_display.c | 36 |
1 files changed, 28 insertions, 8 deletions
diff --git a/drivers/gpu/drm/mcde/mcde_display.c b/drivers/gpu/drm/mcde/mcde_display.c index d608cc894e01..c271e5bf042e 100644 --- a/drivers/gpu/drm/mcde/mcde_display.c +++ b/drivers/gpu/drm/mcde/mcde_display.c @@ -999,6 +999,16 @@ static void mcde_display_enable(struct drm_simple_display_pipe *pipe, mcde_configure_fifo(mcde, MCDE_FIFO_A, MCDE_DSI_FORMATTER_0, fifo_wtrmrk); + /* + * This brings up the DSI bridge which is tightly connected + * to the MCDE DSI formatter. + * + * FIXME: if we want to use another formatter, such as DPI, + * we need to be more elaborate here and select the appropriate + * bridge. + */ + mcde_dsi_enable(mcde->bridge); + /* Configure the DSI formatter 0 for the DSI panel output */ mcde_configure_dsi_formatter(mcde, MCDE_DSI_FORMATTER_0, formatter_frame, pkt_size); @@ -1025,16 +1035,20 @@ static void mcde_display_enable(struct drm_simple_display_pipe *pipe, drm_crtc_vblank_on(crtc); - if (mcde_flow_is_video(mcde)) { - /* - * Keep FIFO permanently enabled in video mode, - * otherwise MCDE will stop feeding data to the panel. - */ + /* + * If we're using oneshot mode we don't start the flow + * until each time the display is given an update, and + * then we disable it immediately after. For all other + * modes (command or video) we start the FIFO flow + * right here. This is necessary for the hardware to + * behave right. + */ + if (mcde->flow_mode != MCDE_COMMAND_ONESHOT_FLOW) { mcde_enable_fifo(mcde, MCDE_FIFO_A); dev_dbg(mcde->dev, "started MCDE video FIFO flow\n"); } - /* Enable automatic clock gating */ + /* Enable MCDE with automatic clock gating */ val = readl(mcde->regs + MCDE_CR); val |= MCDE_CR_MCDEEN | MCDE_CR_AUTOCLKG_EN; writel(val, mcde->regs + MCDE_CR); @@ -1055,6 +1069,9 @@ static void mcde_display_disable(struct drm_simple_display_pipe *pipe) /* Disable FIFO A flow */ mcde_disable_fifo(mcde, MCDE_FIFO_A, true); + /* This disables the DSI bridge */ + mcde_dsi_disable(mcde->bridge); + event = crtc->state->event; if (event) { crtc->state->event = NULL; @@ -1164,8 +1181,11 @@ static void mcde_display_update(struct drm_simple_display_pipe *pipe, if (fb) { mcde_set_extsrc(mcde, drm_fb_cma_get_gem_addr(fb, pstate, 0)); dev_info_once(mcde->dev, "first update of display contents\n"); - /* The flow is already active in video mode */ - if (!mcde_flow_is_video(mcde) && mcde->flow_active == 0) + /* + * Usually the flow is already active, unless we are in + * oneshot mode, then we need to kick the flow right here. + */ + if (mcde->flow_active == 0) mcde_start_flow(mcde); } else { /* |