linux-kernel - [PATCH 3/4] mmc: sunxi: Reset behavior fix

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Date:	Tue, 16 Dec 2014 01:37:56 +0100
From:	David Lanzendörfer <david.lanzendoerfer@....ch>
To:	Ulf Hansson <ulf.hansson@...aro.org>,
	Tomeu Vizoso <tomeu.vizoso@...labora.com>,
	Arnd Bergmann <arnd@...db.de>, linux-mmc@...r.kernel.org,
	Chris Ball <chris@...ntf.net>, linux-kernel@...r.kernel.org,
	Peter Griffin <peter.griffin@...aro.org>,
	Hans de Goede <hdegoede@...hat.com>,
	Chen-Yu Tsai <wens@...e.org>,
	David Lanzendörfer <david.lanzendoerfer@....ch>,
	李想 <lixiang@...winnertech.com>,
	Maxime Ripard <maxime.ripard@...e-electrons.com>,
	linux-arm-kernel@...ts.infradead.org
Subject: [PATCH 3/4] mmc: sunxi: Reset behavior fix

When there is only one DES available the DMA performs a FIFO reset and waits until the reinitialization has been completed.
Disabling the SDXC_IDMAC_DES0_DIC bit prevents the DMA from sending an interrupt after it has finished this reinitialization.

The flags SDXC_IDMAC_DES0_FD and SDXC_IDMAC_DES0_LD are both required in order to use the controller with more than one DES.

Signed-off-by: David Lanzendörfer <david.lanzendoerfer@....ch>
Reported-by: 李想 <lixiang@...winnertech.com>
---
 drivers/mmc/host/sunxi-mmc.c |   12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/drivers/mmc/host/sunxi-mmc.c b/drivers/mmc/host/sunxi-mmc.c
index 50bd3d2..5331c88 100644
--- a/drivers/mmc/host/sunxi-mmc.c
+++ b/drivers/mmc/host/sunxi-mmc.c
@@ -310,7 +310,17 @@ static void sunxi_mmc_init_idma_des(struct sunxi_mmc_host *host,
 	}
 
 	pdes[0].config |= SDXC_IDMAC_DES0_FD;
-	pdes[i - 1].config = SDXC_IDMAC_DES0_OWN | SDXC_IDMAC_DES0_LD;
+
+	/*
+	 * When there is only one DES available the DMA performs a FIFO reset and waits
+	 * until the reinitialization has been completed.
+	 * Disabling the SDXC_IDMAC_DES0_DIC bit prevents the DMA from sending an interrupt
+	 * after it has finished this reinitialization.
+	 */
+	pdes[i - 1].config = SDXC_IDMAC_DES0_OWN;
+	pdes[i - 1].config |= SDXC_IDMAC_DES0_FD;
+	pdes[i - 1].config |= SDXC_IDMAC_DES0_LD;
+	pdes[i - 1].config &= ~SDXC_IDMAC_DES0_DIC;
 
 	/*
 	 * Avoid the io-store starting the idmac hitting io-mem before the

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