diff options
Diffstat (limited to 'drivers/video/tegra124/display.c')
-rw-r--r-- | drivers/video/tegra124/display.c | 114 |
1 files changed, 114 insertions, 0 deletions
diff --git a/drivers/video/tegra124/display.c b/drivers/video/tegra124/display.c index 372ad3e..7179dbf 100644 --- a/drivers/video/tegra124/display.c +++ b/drivers/video/tegra124/display.c @@ -95,6 +95,120 @@ static int update_display_mode(struct dc_ctlr *disp_ctrl, return 0; } +static u32 tegra_dc_poll_register(void *reg, + u32 mask, u32 exp_val, u32 poll_interval_us, u32 timeout_us) +{ + u32 temp = timeout_us; + u32 reg_val = 0; + + do { + udelay(poll_interval_us); + reg_val = readl(reg); + if (timeout_us > poll_interval_us) + timeout_us -= poll_interval_us; + else + break; + } while ((reg_val & mask) != exp_val); + + if ((reg_val & mask) == exp_val) + return 0; /* success */ + + return temp; +} + +int tegra_dc_sor_general_act(struct dc_ctlr *disp_ctrl) +{ + writel(GENERAL_ACT_REQ, &disp_ctrl->cmd.state_ctrl); + + if (tegra_dc_poll_register(&disp_ctrl->cmd.state_ctrl, + GENERAL_ACT_REQ, 0, 100, + DC_POLL_TIMEOUT_MS * 1000)) { + debug("dc timeout waiting for DC to stop\n"); + return -ETIMEDOUT; + } + + return 0; +} + +static struct display_timing min_mode = { + .hsync_len = { .typ = 1 }, + .vsync_len = { .typ = 1 }, + .hback_porch = { .typ = 20 }, + .vback_porch = { .typ = 0 }, + .hactive = { .typ = 16 }, + .vactive = { .typ = 16 }, + .hfront_porch = { .typ = 1 }, + .vfront_porch = { .typ = 2 }, +}; + +/* Disable windows and set minimum raster timings */ +void tegra_dc_sor_disable_win_short_raster(struct dc_ctlr *disp_ctrl, + int *dc_reg_ctx) +{ + const int href_to_sync = 0, vref_to_sync = 1; + int selected_windows, i; + + selected_windows = readl(&disp_ctrl->cmd.disp_win_header); + + /* Store and clear window options */ + for (i = 0; i < DC_N_WINDOWS; ++i) { + writel(WINDOW_A_SELECT << i, &disp_ctrl->cmd.disp_win_header); + dc_reg_ctx[i] = readl(&disp_ctrl->win.win_opt); + writel(0, &disp_ctrl->win.win_opt); + writel(WIN_A_ACT_REQ << i, &disp_ctrl->cmd.state_ctrl); + } + + writel(selected_windows, &disp_ctrl->cmd.disp_win_header); + + /* Store current raster timings and set minimum timings */ + dc_reg_ctx[i++] = readl(&disp_ctrl->disp.ref_to_sync); + writel(href_to_sync | (vref_to_sync << 16), + &disp_ctrl->disp.ref_to_sync); + + dc_reg_ctx[i++] = readl(&disp_ctrl->disp.sync_width); + writel(min_mode.hsync_len.typ | (min_mode.vsync_len.typ << 16), + &disp_ctrl->disp.sync_width); + + dc_reg_ctx[i++] = readl(&disp_ctrl->disp.back_porch); + writel(min_mode.hback_porch.typ | (min_mode.vback_porch.typ << 16), + &disp_ctrl->disp.back_porch); + + dc_reg_ctx[i++] = readl(&disp_ctrl->disp.front_porch); + writel(min_mode.hfront_porch.typ | (min_mode.vfront_porch.typ << 16), + &disp_ctrl->disp.front_porch); + + dc_reg_ctx[i++] = readl(&disp_ctrl->disp.disp_active); + writel(min_mode.hactive.typ | (min_mode.vactive.typ << 16), + &disp_ctrl->disp.disp_active); + + writel(GENERAL_ACT_REQ, &disp_ctrl->cmd.state_ctrl); +} + +/* Restore previous windows status and raster timings */ +void tegra_dc_sor_restore_win_and_raster(struct dc_ctlr *disp_ctrl, + int *dc_reg_ctx) +{ + int selected_windows, i; + + selected_windows = readl(&disp_ctrl->cmd.disp_win_header); + + for (i = 0; i < DC_N_WINDOWS; ++i) { + writel(WINDOW_A_SELECT << i, &disp_ctrl->cmd.disp_win_header); + writel(dc_reg_ctx[i], &disp_ctrl->win.win_opt); + writel(WIN_A_ACT_REQ << i, &disp_ctrl->cmd.state_ctrl); + } + + writel(selected_windows, &disp_ctrl->cmd.disp_win_header); + + writel(dc_reg_ctx[i++], &disp_ctrl->disp.ref_to_sync); + writel(dc_reg_ctx[i++], &disp_ctrl->disp.sync_width); + writel(dc_reg_ctx[i++], &disp_ctrl->disp.back_porch); + writel(dc_reg_ctx[i++], &disp_ctrl->disp.front_porch); + writel(dc_reg_ctx[i++], &disp_ctrl->disp.disp_active); + + writel(GENERAL_UPDATE, &disp_ctrl->cmd.state_ctrl); +} + static int tegra_depth_for_bpp(int bpp) { switch (bpp) { |