xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

powerpc/mpic: Remove MPIC_BROKEN_FRR_NIRQS and duplicate irq_count

Browse Source 
The mpic->irq_count variable is only used as a software error-checking
limit to determine whether or not an IRQ number is valid.  In board code
which does not manually specify an IRQ count to mpic_alloc(), i.e. 0, it
is automatically detected from the number of ISUs and the ISU size.

In practice, all hardware ends up with irq_count == num_sources, so all
of the runtime checks on mpic->irq_count should just check the value of
mpic->num_sources instead.

When platform hardware does not correctly report the number of IRQs,
which only happens on the MPC85xx/MPC86xx, the MPIC_BROKEN_FRR_NIRQS
flag is used to override the detected value of num_sources with the
manual irq_count parameter.  Since there's no need to manually specify
the number of IRQs except in this case, the extra flag can be eliminated
and the test changed to "irq_count != 0".

Signed-off-by: Kyle Moffett <Kyle.D.Moffett@boeing.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Kyle Moffett
2011-12-22 10:19:12 +00:00
committed by Benjamin Herrenschmidt
parent 9ca163c860
commit 5019609fce
18 changed files with 25 additions and 38 deletions
Download Patch File Download Diff File Expand all files Collapse all files

2
arch/powerpc/platforms/86xx/pic.c
View File

@@ -39,7 +39,7 @@ void __init mpc86xx_init_irq(void)
struct mpic *mpic = mpic_alloc(NULL, 0,
MPIC_WANTS_RESET | MPIC_BIG_ENDIAN |
MPIC_BROKEN_FRR_NIRQS | MPIC_SINGLE_DEST_CPU,
MPIC_SINGLE_DEST_CPU,
0, 256, " MPIC ");
BUG_ON(mpic == NULL);