At Mon, 27 Aug 2012 22:25:21 -0400, David Flater wrote:
v2: Fixed result still wrong in the case of 512 KiB DRAM. Oops.
Applicable to 3.5.3 mainline.
In emu8000.c, size_dram determines the amount of memory on the sound card by doing write/readback tests starting at 512 KiB and incrementing by 512 KiB. On success, detected_size is updated to the successful address and testing continues. On failure, the loop is immediately exited. The resulting detected_size is 512 KiB too small except in two special cases:
- If there is no memory, the initial 0 value of detected_size is used, which is correct.
- If the address space wraps around, detected_size is updated before the bailout, so the result is correct.
The patch corrects all cases and was tested with an AWE64 Gold. Before: EMU8000 [0x620]: 3584 Kb on-board memory detected asfxload 4GMGSMT.SF2 (4174814 B) fails. After: EMU8000 [0x620]: 4096 Kb on-board memory detected asfxload 4GMGSMT.SF2 succeeds.
I do not have a card with 512 KiB to test with, but by forcibly enabling the added conditional I verified on the AWE64 Gold that it detects 512 KiB (successfully reading from the first memory location) and does not hang the card.
C.f. Bug 46451 https://bugzilla.kernel.org/show_bug.cgi?id=46451
Signed-off-by: David Flater dave@flaterco.com
Thanks, applied.
Takashi
--- linux-3.5.3-nameless/sound/isa/sb/emu8000.c.orig 2012-08-25 22:32:13.000000000 -0400 +++ linux-3.5.3-nameless/sound/isa/sb/emu8000.c 2012-08-27 22:06:15.729510037 -0400 @@ -417,9 +417,6 @@ size_dram(struct snd_emu8000 *emu) EMU8000_SMLD_READ(emu); /* discard stale data */ if (EMU8000_SMLD_READ(emu) != UNIQUE_ID2) break; /* no memory at this address */
detected_size = size;snd_emu8000_read_wait(emu);
/*
@@ -432,6 +429,18 @@ size_dram(struct snd_emu8000 *emu) if (EMU8000_SMLD_READ(emu) != UNIQUE_ID1) break; /* we must have wrapped around */ snd_emu8000_read_wait(emu);
/* Otherwise, it's valid memory. */detected_size = size + 512 * 1024;}
/* Distinguish 512 KiB from 0. */
if (detected_size == 0) {
snd_emu8000_read_wait(emu);EMU8000_SMALR_WRITE(emu, EMU8000_DRAM_OFFSET);EMU8000_SMLD_READ(emu); /* discard stale data */if (EMU8000_SMLD_READ(emu) == UNIQUE_ID1)detected_size = 512 * 1024;}
/* wait until FULL bit in SMAxW register is false */
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