diff options
Diffstat (limited to 'drivers/gpu/drm/rcar-du/rcar_du_group.c')
| -rw-r--r-- | drivers/gpu/drm/rcar-du/rcar_du_group.c | 187 |
1 files changed, 187 insertions, 0 deletions
diff --git a/drivers/gpu/drm/rcar-du/rcar_du_group.c b/drivers/gpu/drm/rcar-du/rcar_du_group.c new file mode 100644 index 000000000000..eb53cd97e8c6 --- /dev/null +++ b/drivers/gpu/drm/rcar-du/rcar_du_group.c @@ -0,0 +1,187 @@ +/* + * rcar_du_group.c -- R-Car Display Unit Channels Pair + * + * Copyright (C) 2013 Renesas Corporation + * + * Contact: Laurent Pinchart (laurent.pinchart@ideasonboard.com) + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + */ + +/* + * The R8A7779 DU is split in per-CRTC resources (scan-out engine, blending + * unit, timings generator, ...) and device-global resources (start/stop + * control, planes, ...) shared between the two CRTCs. + * + * The R8A7790 introduced a third CRTC with its own set of global resources. + * This would be modeled as two separate DU device instances if it wasn't for + * a handful or resources that are shared between the three CRTCs (mostly + * related to input and output routing). For this reason the R8A7790 DU must be + * modeled as a single device with three CRTCs, two sets of "semi-global" + * resources, and a few device-global resources. + * + * The rcar_du_group object is a driver specific object, without any real + * counterpart in the DU documentation, that models those semi-global resources. + */ + +#include <linux/clk.h> +#include <linux/io.h> + +#include "rcar_du_drv.h" +#include "rcar_du_group.h" +#include "rcar_du_regs.h" + +u32 rcar_du_group_read(struct rcar_du_group *rgrp, u32 reg) +{ + return rcar_du_read(rgrp->dev, rgrp->mmio_offset + reg); +} + +void rcar_du_group_write(struct rcar_du_group *rgrp, u32 reg, u32 data) +{ + rcar_du_write(rgrp->dev, rgrp->mmio_offset + reg, data); +} + +static void rcar_du_group_setup_defr8(struct rcar_du_group *rgrp) +{ + u32 defr8 = DEFR8_CODE | DEFR8_DEFE8; + + if (!rcar_du_has(rgrp->dev, RCAR_DU_FEATURE_DEFR8)) + return; + + /* The DEFR8 register for the first group also controls RGB output + * routing to DPAD0 + */ + if (rgrp->index == 0) + defr8 |= DEFR8_DRGBS_DU(rgrp->dev->dpad0_source); + + rcar_du_group_write(rgrp, DEFR8, defr8); +} + +static void rcar_du_group_setup(struct rcar_du_group *rgrp) +{ + /* Enable extended features */ + rcar_du_group_write(rgrp, DEFR, DEFR_CODE | DEFR_DEFE); + rcar_du_group_write(rgrp, DEFR2, DEFR2_CODE | DEFR2_DEFE2G); + rcar_du_group_write(rgrp, DEFR3, DEFR3_CODE | DEFR3_DEFE3); + rcar_du_group_write(rgrp, DEFR4, DEFR4_CODE); + rcar_du_group_write(rgrp, DEFR5, DEFR5_CODE | DEFR5_DEFE5); + + rcar_du_group_setup_defr8(rgrp); + + /* Use DS1PR and DS2PR to configure planes priorities and connects the + * superposition 0 to DU0 pins. DU1 pins will be configured dynamically. + */ + rcar_du_group_write(rgrp, DORCR, DORCR_PG1D_DS1 | DORCR_DPRS); +} + +/* + * rcar_du_group_get - Acquire a reference to the DU channels group + * + * Acquiring the first reference setups core registers. A reference must be held + * before accessing any hardware registers. + * + * This function must be called with the DRM mode_config lock held. + * + * Return 0 in case of success or a negative error code otherwise. + */ +int rcar_du_group_get(struct rcar_du_group *rgrp) +{ + if (rgrp->use_count) + goto done; + + rcar_du_group_setup(rgrp); + +done: + rgrp->use_count++; + return 0; +} + +/* + * rcar_du_group_put - Release a reference to the DU + * + * This function must be called with the DRM mode_config lock held. + */ +void rcar_du_group_put(struct rcar_du_group *rgrp) +{ + --rgrp->use_count; +} + +static void __rcar_du_group_start_stop(struct rcar_du_group *rgrp, bool start) +{ + rcar_du_group_write(rgrp, DSYSR, + (rcar_du_group_read(rgrp, DSYSR) & ~(DSYSR_DRES | DSYSR_DEN)) | + (start ? DSYSR_DEN : DSYSR_DRES)); +} + +void rcar_du_group_start_stop(struct rcar_du_group *rgrp, bool start) +{ + /* Many of the configuration bits are only updated when the display + * reset (DRES) bit in DSYSR is set to 1, disabling *both* CRTCs. Some + * of those bits could be pre-configured, but others (especially the + * bits related to plane assignment to display timing controllers) need + * to be modified at runtime. + * + * Restart the display controller if a start is requested. Sorry for the + * flicker. It should be possible to move most of the "DRES-update" bits + * setup to driver initialization time and minimize the number of cases + * when the display controller will have to be restarted. + */ + if (start) { + if (rgrp->used_crtcs++ != 0) + __rcar_du_group_start_stop(rgrp, false); + __rcar_du_group_start_stop(rgrp, true); + } else { + if (--rgrp->used_crtcs == 0) + __rcar_du_group_start_stop(rgrp, false); + } +} + +void rcar_du_group_restart(struct rcar_du_group *rgrp) +{ + __rcar_du_group_start_stop(rgrp, false); + __rcar_du_group_start_stop(rgrp, true); +} + +static int rcar_du_set_dpad0_routing(struct rcar_du_device *rcdu) +{ + int ret; + + /* RGB output routing to DPAD0 is configured in the DEFR8 register of + * the first group. As this function can be called with the DU0 and DU1 + * CRTCs disabled, we need to enable the first group clock before + * accessing the register. + */ + ret = clk_prepare_enable(rcdu->crtcs[0].clock); + if (ret < 0) + return ret; + + rcar_du_group_setup_defr8(&rcdu->groups[0]); + + clk_disable_unprepare(rcdu->crtcs[0].clock); + + return 0; +} + +int rcar_du_group_set_routing(struct rcar_du_group *rgrp) +{ + struct rcar_du_crtc *crtc0 = &rgrp->dev->crtcs[rgrp->index * 2]; + u32 dorcr = rcar_du_group_read(rgrp, DORCR); + + dorcr &= ~(DORCR_PG2T | DORCR_DK2S | DORCR_PG2D_MASK); + + /* Set the DPAD1 pins sources. Select CRTC 0 if explicitly requested and + * CRTC 1 in all other cases to avoid cloning CRTC 0 to DPAD0 and DPAD1 + * by default. + */ + if (crtc0->outputs & BIT(RCAR_DU_OUTPUT_DPAD1)) + dorcr |= DORCR_PG2D_DS1; + else + dorcr |= DORCR_PG2T | DORCR_DK2S | DORCR_PG2D_DS2; + + rcar_du_group_write(rgrp, DORCR, dorcr); + + return rcar_du_set_dpad0_routing(rgrp->dev); +} |