linux-kernel - [PATCH] m68k/mac: Remove redundant VIA register writes

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Message-Id: <c6b1d9620af3e8f89dd0157a41fa4147294b251d.1605847196.git.fthain@telegraphics.com.au>
Date:   Fri, 20 Nov 2020 15:39:56 +1100
From:   Finn Thain <fthain@...egraphics.com.au>
To:     Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:     "Joshua Thompson" <funaho@...ai.org>,
        linux-m68k@...ts.linux-m68k.org, linux-kernel@...r.kernel.org
Subject: [PATCH] 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@...ai.org>
Tested-by: Stan Johnson <userm57@...oo.com>
Signed-off-by: Finn Thain <fthain@...egraphics.com.au>
---
 arch/m68k/mac/via.c | 6 ------
 1 file changed, 6 deletions(-)

diff --git a/arch/m68k/mac/via.c b/arch/m68k/mac/via.c
index 4226ae2e7501..36ff997d4706 100644
--- a/arch/m68k/mac/via.c
+++ b/arch/m68k/mac/via.c
@@ -170,8 +170,6 @@ 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;
@@ -226,8 +224,6 @@ 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;
@@ -605,8 +601,6 @@ 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;
-- 
2.26.2