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linux-next/arch/arm/mach-omap2/display.h

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ARM: OMAP2PLUS: DSS: Ensure DSS works correctly if display is enabled in bootloader Resetting DISPC when a DISPC output is enabled causes the DSS to go into an inconsistent state. Thus if the bootloader has enabled a display, the hwmod code cannot reset the DISPC module just like that, but the outputs need to be disabled first. Add function dispc_disable_outputs() which disables all active overlay manager and ensure all frame transfers are completed. Modify omap_dss_reset() to call this function and clear DSS_CONTROL, DSS_SDI_CONTROL and DSS_PLL_CONTROL so that DSS is in a clean state when the DSS2 driver starts. This resolves the hang issue(caused by a L3 error during boot) seen on the beagle board C3, which has a factory bootloader that enables display. The issue is resolved with this patch. Thanks to Tomi and Sricharan for some additional testing. Acked-by: Tomi Valkeinen <tomi.valkeinen@ti.com> Tested-by: R, Sricharan <r.sricharan@ti.com> Signed-off-by: Archit Taneja <archit@ti.com> [paul@pwsan.com: restructured code, removed omap_{read,write}l(), removed cpu_is_omap*() calls and converted to dev_attr] Signed-off-by: Paul Walmsley <paul@pwsan.com>
2011-10-07 08:04:08 +08:00
/*
* display.h - OMAP2+ integration-specific DSS header
*
* Copyright (C) 2011 Texas Instruments, Inc.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 as published by
* the Free Software Foundation.
*
* This program is distributed in the hope that 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.
*
* You should have received a copy of the GNU General Public License along with
* this program. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef __ARCH_ARM_MACH_OMAP2_DISPLAY_H
#define __ARCH_ARM_MACH_OMAP2_DISPLAY_H
#include <linux/kernel.h>
struct omap_dss_dispc_dev_attr {
u8 manager_count;
bool has_framedonetv_irq;
};
#endif
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