Right now, all we need to know about the blitter is that it's not doing anything that can be messed up when fiddling with MMU mappings.
Signed-off-by: Patrik Jakobsson patrik.r.jakobsson@gmail.com --- drivers/gpu/drm/gma500/Makefile | 1 + drivers/gpu/drm/gma500/blitter.c | 51 ++++++++++++++++++++++++++++++++++++++++ drivers/gpu/drm/gma500/blitter.h | 22 +++++++++++++++++ 3 files changed, 74 insertions(+) create mode 100644 drivers/gpu/drm/gma500/blitter.c create mode 100644 drivers/gpu/drm/gma500/blitter.h
diff --git a/drivers/gpu/drm/gma500/Makefile b/drivers/gpu/drm/gma500/Makefile index e9064dd..69c0d7f 100644 --- a/drivers/gpu/drm/gma500/Makefile +++ b/drivers/gpu/drm/gma500/Makefile @@ -13,6 +13,7 @@ gma500_gfx-y += \ intel_i2c.o \ intel_gmbus.o \ mmu.o \ + blitter.o \ power.o \ psb_drv.o \ gma_display.o \ diff --git a/drivers/gpu/drm/gma500/blitter.c b/drivers/gpu/drm/gma500/blitter.c new file mode 100644 index 0000000..9cd54a6 --- /dev/null +++ b/drivers/gpu/drm/gma500/blitter.c @@ -0,0 +1,51 @@ +/* + * Copyright (c) 2014, Patrik Jakobsson + * All Rights Reserved. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms and conditions of the GNU General Public License, + * version 2, as published by the Free Software Foundation. + * + * This program is distributed in the hope it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + * + * Authors: Patrik Jakobsson patrik.r.jakobsson@gmail.com + */ + +#include "psb_drv.h" + +#include "blitter.h" +#include "psb_reg.h" + +/* Wait for the blitter to be completely idle */ +int gma_blt_wait_idle(struct drm_psb_private *dev_priv) +{ + unsigned long stop = jiffies + HZ; + int busy = 1; + + /* NOP for Cedarview */ + if (IS_CDV(dev_priv->dev)) + return 0; + + /* First do a quick check */ + if ((PSB_RSGX32(PSB_CR_2D_SOCIF) == _PSB_C2_SOCIF_EMPTY) && + ((PSB_RSGX32(PSB_CR_2D_BLIT_STATUS) & _PSB_C2B_STATUS_BUSY) == 0)) + return 0; + + do { + busy = (PSB_RSGX32(PSB_CR_2D_SOCIF) != _PSB_C2_SOCIF_EMPTY); + } while (busy && !time_after_eq(jiffies, stop)); + + if (busy) + return -EBUSY; + + do { + busy = ((PSB_RSGX32(PSB_CR_2D_BLIT_STATUS) & + _PSB_C2B_STATUS_BUSY) != 0); + } while (busy && !time_after_eq(jiffies, stop)); + + /* If still busy, we probably have a hang */ + return (busy) ? -EBUSY : 0; +} diff --git a/drivers/gpu/drm/gma500/blitter.h b/drivers/gpu/drm/gma500/blitter.h new file mode 100644 index 0000000..b83648d --- /dev/null +++ b/drivers/gpu/drm/gma500/blitter.h @@ -0,0 +1,22 @@ +/* + * Copyright (c) 2014, Patrik Jakobsson + * All Rights Reserved. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms and conditions of the GNU General Public License, + * version 2, as published by the Free Software Foundation. + * + * This program is distributed in the hope it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + * + * Authors: Patrik Jakobsson patrik.r.jakobsson@gmail.com + */ + +#ifndef __BLITTER_H +#define __BLITTER_H + +extern int gma_blt_wait_idle(struct drm_psb_private *dev_priv); + +#endif