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:
>
> 1. If there is no memory, the initial 0 value of detected_size is used, which
> is correct.
> 2. 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 <[email protected]>
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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