linux-kernel - [PATCH] mmc: dw_mmc: Consider HLE errors to be data and command errors

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Date:	Tue, 10 Mar 2015 08:48:10 -0700
From:	Doug Anderson <dianders@...omium.org>
To:	Jaehoon Chung <jh80.chung@...sung.com>,
	Seungwon Jeon <tgih.jun@...sung.com>,
	Ulf Hansson <ulf.hansson@...aro.org>
Cc:	Alim Akhtar <alim.akhtar@...sung.com>,
	Sonny Rao <sonnyrao@...omium.org>,
	Andrew Bresticker <abrestic@...omium.org>,
	Heiko Stuebner <heiko@...ech.de>,
	Addy Ke <addy.ke@...k-chips.com>,
	Alexandru Stan <amstan@...omium.org>,
	javier.martinez@...labora.co.uk,
	linux-rockchip@...ts.infradead.org,
	linux-arm-kernel@...ts.infradead.org,
	Doug Anderson <dianders@...omium.org>, chris@...ntf.net,
	linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] mmc: dw_mmc: Consider HLE errors to be data and command errors

The dw_mmc driver enables HLE errors as part of DW_MCI_ERROR_FLAGS but
nothing in the interrupt handler actually handles them and ACKs them.
That means that if we ever get an HLE error we'll just keep getting
interrupts and we'll wedge things.

We really don't expect HLE errors but if we ever get them we shouldn't
silently ignore them.

Note that I have seen HLE errors while constantly ejecting and
inserting cards (ejecting while inserting, etc).

Signed-off-by: Doug Anderson <dianders@...omium.org>
---
Note that this works together with the patch I sent up yesterday (the
CMD 11 timer).  I would have sent the two together except that I had
local printouts (and ACKing of HLE) and didn't realize that this was
also required for a full solution.

 drivers/mmc/host/dw_mmc.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/mmc/host/dw_mmc.c b/drivers/mmc/host/dw_mmc.c
index 47dfd0e..294edc9c 100644
--- a/drivers/mmc/host/dw_mmc.c
+++ b/drivers/mmc/host/dw_mmc.c
@@ -44,11 +44,11 @@
 /* Common flag combinations */
 #define DW_MCI_DATA_ERROR_FLAGS	(SDMMC_INT_DRTO | SDMMC_INT_DCRC | \
 				 SDMMC_INT_HTO | SDMMC_INT_SBE  | \
-				 SDMMC_INT_EBE)
+				 SDMMC_INT_EBE | SDMMC_INT_HLE)
 #define DW_MCI_CMD_ERROR_FLAGS	(SDMMC_INT_RTO | SDMMC_INT_RCRC | \
-				 SDMMC_INT_RESP_ERR)
+				 SDMMC_INT_RESP_ERR | SDMMC_INT_HLE)
 #define DW_MCI_ERROR_FLAGS	(DW_MCI_DATA_ERROR_FLAGS | \
-				 DW_MCI_CMD_ERROR_FLAGS  | SDMMC_INT_HLE)
+				 DW_MCI_CMD_ERROR_FLAGS)
 #define DW_MCI_SEND_STATUS	1
 #define DW_MCI_RECV_STATUS	2
 #define DW_MCI_DMA_THRESHOLD	16
-- 
2.2.0.rc0.207.ga3a616c

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