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ESP: fix spurious guest interrupts during boot

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Signed-off-by: Blue Swirl <blauwirbel@gmail.com>

git-svn-id: svn://coreboot.org/openbios/trunk/openbios-devel@665 f158a5a8-5612-0410-a976-696ce0be7e32
This commit is contained in:
Blue Swirl
2010-01-16 08:47:39 +00:00
parent 2478d67d9e
commit d3aebe27d3
1 changed files with 7 additions and 0 deletions
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7
drivers/esp.c
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@@ -101,6 +101,9 @@ do_command(esp_private_t *esp, sd_private_t *sd, int cmdlen, int replylen)
esp->ll->regs[ESP_CMD] = ESP_CMD_SELA | ESP_CMD_DMA;
// Wait for DMA to complete. Can this fail?
while ((esp->espdma.regs->cond_reg & DMA_HNDL_INTR) == 0) /* no-op */;
// Clear interrupts to avoid guests seeing spurious interrupts
(void)esp->ll->regs[ESP_INTRPT];
// Check status
status = esp->ll->regs[ESP_STATUS];
@@ -124,6 +127,10 @@ do_command(esp_private_t *esp, sd_private_t *sd, int cmdlen, int replylen)
esp->ll->regs[ESP_CMD] = ESP_CMD_TI | ESP_CMD_DMA;
// Wait for DMA to complete
while ((esp->espdma.regs->cond_reg & DMA_HNDL_INTR) == 0) /* no-op */;
// Clear interrupts to avoid guests seeing spurious interrupts
(void)esp->ll->regs[ESP_INTRPT];
// Check status
status = esp->ll->regs[ESP_STATUS];