From: David Flater <vger@flaterco.com>
To: Alsa Devel <alsa-devel@vger.kernel.org>,
Linux Kernel <linux-kernel@vger.kernel.org>
Subject: [PATCHv2] sound: fix emu8000 DRAM sized 512 KiB too small
Date: Mon, 27 Aug 2012 22:25:21 -0400 [thread overview]
Message-ID: <503C2C11.8020202@flaterco.com> (raw)
In-Reply-To: <503C1133.7000506@flaterco.com>
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 <dave@flaterco.com>
---
--- 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 */
next prev parent reply other threads:[~2012-08-28 2:25 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-08-28 0:30 [PATCH] sound: fix emu8000 DRAM sized 512 KiB too small David Flater
2012-08-28 2:25 ` David Flater [this message]
2012-08-28 18:01 ` [PATCHv2] " Takashi Iwai
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