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arm/raspberrypi: framebuffer driver checks for initialization and tries runtime init if required.

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Code works but there is problem how to setup caching for the regions
(arm_cp15_set_translation_table_entries arguments).

If ARMV7_MMU_DATA_READ_WRITE_CACHED is used then CPU
accesses are noncoherent with VideoCore and some
part of image update are not visible until pushed from
cache by other activities. If ARMV7_MMU_DATA_READ_WRITE
is used then access is extremely slow.

Signed-off-by: Pavel Pisa <pisa@cmp.felk.cvut.cz>
This commit is contained in:
Pavel Pisa
2016-07-31 13:10:28 +02:00
parent 3d3ad4dc1c
commit 912a1a90ce
1 changed files with 11 additions and 1 deletions
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12
c/src/lib/libbsp/arm/raspberrypi/console/fb.c
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@@ -319,10 +319,20 @@ rtems_device_driver frame_buffer_open(
{
if ( _Atomic_Flag_test_and_set( &driver_mutex,
ATOMIC_ORDER_ACQUIRE ) != 0 ) {
printk( "FB_CIRRUS could not lock driver_mutex\n" );
printk( "RaspberryPi framebuffer could not lock driver_mutex\n" );
return RTEMS_UNSATISFIED;
}
if ( fb_fix_info.smem_start == NULL ) {
int res;
res = rpi_fb_init();
if ( (res < RPI_FB_INIT_OK) || (fb_fix_info.smem_start == NULL) ) {
_Atomic_Flag_clear( &driver_mutex, ATOMIC_ORDER_RELEASE );
printk( "RaspberryPi framebuffer initialization failed\n" );
return RTEMS_UNSATISFIED;
}
}
memset( (void *) fb_fix_info.smem_start, 0, fb_fix_info.smem_len );
return RTEMS_SUCCESSFUL;
}