From 3cc75aa740bb27e4ff270759226182a35ad70611 Mon Sep 17 00:00:00 2001
From: jmcneill <jmcneill@NetBSD.org>
Date: Thu, 23 Jul 2015 23:52:54 +0000
Subject: [PATCH] Add a SDHC_FLAG_NO_TIMEOUT quirk to handle spurious timeouts
 on Tegra K1 during data transfers. While here, increase the soft timeout for
 DMA transfers from 1s to 3s.

---
 sys/dev/sdmmc/sdhc.c    | 19 +++++++++++++++----
 sys/dev/sdmmc/sdhcvar.h |  3 ++-
 2 files changed, 17 insertions(+), 5 deletions(-)

diff --git a/sys/dev/sdmmc/sdhc.c b/sys/dev/sdmmc/sdhc.c
index 868ce0e4b78b..bd61948aa002 100644
--- a/sys/dev/sdmmc/sdhc.c
+++ b/sys/dev/sdmmc/sdhc.c
@@ -1,4 +1,4 @@
-/*	$NetBSD: sdhc.c,v 1.60 2015/07/22 09:54:42 skrll Exp $	*/
+/*	$NetBSD: sdhc.c,v 1.61 2015/07/23 23:52:54 jmcneill Exp $	*/
 /*	$OpenBSD: sdhc.c,v 1.25 2009/01/13 19:44:20 grange Exp $	*/
 
 /*
@@ -23,7 +23,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: sdhc.c,v 1.60 2015/07/22 09:54:42 skrll Exp $");
+__KERNEL_RCSID(0, "$NetBSD: sdhc.c,v 1.61 2015/07/23 23:52:54 jmcneill Exp $");
 
 #ifdef _KERNEL_OPT
 #include "opt_sdmmc.h"
@@ -55,7 +55,7 @@ void	sdhc_dump_regs(struct sdhc_host *);
 #define SDHC_COMMAND_TIMEOUT	hz
 #define SDHC_BUFFER_TIMEOUT	hz
 #define SDHC_TRANSFER_TIMEOUT	hz
-#define SDHC_DMA_TIMEOUT	hz
+#define SDHC_DMA_TIMEOUT	(hz*3)
 
 struct sdhc_host {
 	struct sdhc_softc *sc;		/* host controller device */
@@ -1119,6 +1119,17 @@ sdhc_exec_command(sdmmc_chipset_handle_t sch, struct sdmmc_command *cmd)
 		mutex_exit(&hp->intr_mtx);
 	}
 
+	if (ISSET(hp->sc->sc_flags, SDHC_FLAG_NO_TIMEOUT)) {
+		const uint16_t eintr = SDHC_CMD_TIMEOUT_ERROR;
+		if (cmd->c_data != NULL) {
+			HCLR2(hp, SDHC_EINTR_SIGNAL_EN, eintr);
+			HCLR2(hp, SDHC_EINTR_STATUS_EN, eintr);
+		} else {
+			HSET2(hp, SDHC_EINTR_SIGNAL_EN, eintr);
+			HSET2(hp, SDHC_EINTR_STATUS_EN, eintr);
+		}
+	}
+
 	/*
 	 * Start the MMC command, or mark `cmd' as failed and return.
 	 */
@@ -1332,7 +1343,7 @@ sdhc_transfer_data(struct sdhc_host *hp, struct sdmmc_command *cmd)
 		if (hp->sc->sc_vendor_transfer_data_dma != NULL) {
 			error = hp->sc->sc_vendor_transfer_data_dma(sc, cmd);
 			if (error == 0 && !sdhc_wait_intr(hp,
-			    SDHC_TRANSFER_COMPLETE, SDHC_TRANSFER_TIMEOUT)) {
+			    SDHC_TRANSFER_COMPLETE, SDHC_DMA_TIMEOUT)) {
 				error = ETIMEDOUT;
 			}
 		} else {
diff --git a/sys/dev/sdmmc/sdhcvar.h b/sys/dev/sdmmc/sdhcvar.h
index 32a0e984e406..e0c84123259d 100644
--- a/sys/dev/sdmmc/sdhcvar.h
+++ b/sys/dev/sdmmc/sdhcvar.h
@@ -1,4 +1,4 @@
-/*	$NetBSD: sdhcvar.h,v 1.18 2015/05/03 11:46:25 jmcneill Exp $	*/
+/*	$NetBSD: sdhcvar.h,v 1.19 2015/07/23 23:52:54 jmcneill Exp $	*/
 /*	$OpenBSD: sdhcvar.h,v 1.3 2007/09/06 08:01:01 jsg Exp $	*/
 
 /*
@@ -54,6 +54,7 @@ struct sdhc_softc {
 #define	SDHC_FLAG_EXTDMA_DMAEN	0x00008000 /* ext. dma need SDHC_DMA_ENABLE */
 #define	SDHC_FLAG_NO_CLKBASE	0x00020000 /* ignore clkbase register */
 #define	SDHC_FLAG_SINGLE_POWER_WRITE 0x00040000
+#define	SDHC_FLAG_NO_TIMEOUT	0x00080000 /* ignore timeout interrupts */
 
 	uint32_t		sc_clkbase;
 	int			sc_clkmsk;	/* Mask for SDCLK */