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macintosh/via-cuda: Don't rely on Cuda to end a transfer 

Certain Cuda transfers have to be ended by the driver. According
to Apple's open source Cuda driver, as found in mkLinux and XNU, this
applies to any "open ended request such as PRAM read". This fixes an
infinite polling loop in cuda_pram_read_byte().

Tested-by: Stan Johnson <userm57@yahoo.com>
Signed-off-by: Finn Thain <fthain@telegraphics.com.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Finn Thain 2019-01-15 15:18:56 +11:00 committed by Greg Kroah-Hartman
parent aefcb7460e
commit 458c77f3de
1 changed files with 5 additions and 3 deletions
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8
drivers/macintosh/via-cuda.c
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@ -569,6 +569,7 @@ cuda_interrupt(int irq, void *arg)
unsigned char ibuf[16];
int ibuf_len = 0;
int complete = 0;
bool full;
spin_lock_irqsave(&cuda_lock, flags);
@ -656,12 +657,13 @@ idle_state:
break;
case reading:
if (reading_reply ? ARRAY_FULL(current_req->reply, reply_ptr)
: ARRAY_FULL(cuda_rbuf, reply_ptr))
full = reading_reply ? ARRAY_FULL(current_req->reply, reply_ptr)
: ARRAY_FULL(cuda_rbuf, reply_ptr);
if (full)
(void)in_8(&via[SR]);
else
*reply_ptr++ = in_8(&via[SR]);
if (!TREQ_asserted(status)) {
if (!TREQ_asserted(status) || full) {
if (mcu_is_egret)
assert_TACK();
/* that's all folks */