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Commit ca460f86 authored by David Henningsson's avatar David Henningsson Committed by Takashi Iwai
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ALSA: hda - Fix CORB reset to follow specification 



According to the HDA spec, we must write 1 to bit 15 on a CORBRP
reset, read back 1, then write 0, then read back 0. This must be
done while the DMA is not running.

We accidentaly ended up writing back the 0 by using a writel
instead of a writew to CORBWP.

This caused occasional controller failure on Bay Trail hardware.

[replaced error messages with dev_err() by tiwai]

Signed-off-by: default avatarDavid Henningsson <david.henningsson@canonical.com>
Signed-off-by: default avatarTakashi Iwai <tiwai@suse.de>
parent d604b399

sound/pci/hda/hda_intel.c

+23 −1
Original line number Diff line number Diff line
@@ -769,6 +769,8 @@ static int azx_alloc_cmd_io(struct azx *chip) 


static void azx_init_cmd_io(struct azx *chip)

{

	int timeout;



	spin_lock_irq(&chip->reg_lock);

	/* CORB set up */

	chip->corb.addr = chip->rb.addr;
@@ -780,8 +782,28 @@ static void azx_init_cmd_io(struct azx *chip) 
	azx_writeb(chip, CORBSIZE, 0x02);

	/* set the corb write pointer to 0 */

	azx_writew(chip, CORBWP, 0);



	/* reset the corb hw read pointer */

	azx_writew(chip, CORBRP, ICH6_CORBRP_RST);

	for (timeout = 1000; timeout > 0; timeout--) {

		if ((azx_readw(chip, CORBRP) & ICH6_CORBRP_RST) == ICH6_CORBRP_RST)

			break;

		udelay(1);

	}

	if (timeout <= 0)

		dev_err(chip->card->dev, "CORB reset timeout#1, CORBRP = %d\n",

			azx_readw(chip, CORBRP));



	azx_writew(chip, CORBRP, 0);

	for (timeout = 1000; timeout > 0; timeout--) {

		if (azx_readw(chip, CORBRP) == 0)

			break;

		udelay(1);

	}

	if (timeout <= 0)

		dev_err(chip->card->dev, "CORB reset timeout#2, CORBRP = %d\n",

			azx_readw(chip, CORBRP));



	/* enable corb dma */

	azx_writeb(chip, CORBCTL, ICH6_CORBCTL_RUN);
@@ -856,7 +878,7 @@ static int azx_corb_send_cmd(struct hda_bus *bus, u32 val) 


	chip->rirb.cmds[addr]++;

	chip->corb.buf[wp] = cpu_to_le32(val);

	azx_writel(chip, CORBWP, wp);

	azx_writew(chip, CORBWP, wp);



	spin_unlock_irq(&chip->reg_lock);