m68k: mac: Remove redundant VIA register writes

There's no need to write the same value to the timer latch and timer
counter registers. Values written to the counter registers get stored
in the latches anyway. The write to vT1CH copies the latch values to
the counter.

Cc: Joshua Thompson <funaho@jurai.org>
Tested-by: Stan Johnson <userm57@yahoo.com>
Signed-off-by: Finn Thain <fthain@telegraphics.com.au>
Link: https://lore.kernel.org/r/c6b1d9620af3e8f89dd0157a41fa4147294b251d.1605847196.git.fthain@telegraphics.com.au
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>

diff --git a/arch/m68k/mac/via.c b/arch/m68k/mac/via.c
index 2217ca6..9f2b32f 100644 (file)
--- a/arch/m68k/mac/via.c
+++ b/arch/m68k/mac/via.c
@@ -169,8 +169,6 @@ void __init via_init(void)
 
        via1[vIER] = 0x7F;
        via1[vIFR] = 0x7F;
-       via1[vT1LL] = 0;
-       via1[vT1LH] = 0;
        via1[vT1CL] = 0;
        via1[vT1CH] = 0;
        via1[vT2CL] = 0;
@@ -225,8 +223,6 @@ void __init via_init(void)
        via2[gIER] = 0x7F;
        via2[gIFR] = 0x7F | rbv_clear;
        if (!rbv_present) {
-               via2[vT1LL] = 0;
-               via2[vT1LH] = 0;
                via2[vT1CL] = 0;
                via2[vT1CH] = 0;
                via2[vT2CL] = 0;
@@ -604,8 +600,6 @@ void __init via_init_clock(irq_handler_t timer_routine)
                return;
        }
 
-       via1[vT1LL] = VIA_TC_LOW;
-       via1[vT1LH] = VIA_TC_HIGH;
        via1[vT1CL] = VIA_TC_LOW;
        via1[vT1CH] = VIA_TC_HIGH;
        via1[vACR] |= 0x40;