From: Peter Rosin <peda@axentia.se>
To: linux-kernel@vger.kernel.org
Cc: Peter Rosin <peda@axentia.se>,
Wenyou Yang <wenyou.yang@microchip.com>,
Josh Wu <rainyfeeling@outlook.com>,
Boris Brezillon <boris.brezillon@bootlin.com>,
Richard Weinberger <richard@nod.at>,
David Woodhouse <dwmw2@infradead.org>,
Brian Norris <computersforpeace@gmail.com>,
Marek Vasut <marek.vasut@gmail.com>,
Cyrille Pitchen <cyrille.pitchen@wedev4u.fr>,
Nicolas Ferre <nicolas.ferre@microchip.com>,
Alexandre Belloni <alexandre.belloni@bootlin.com>,
linux-mtd@lists.infradead.org,
linux-arm-kernel@lists.infradead.org
Subject: [PATCH] mtd: nand: raw: atmel: add module param to avoid using dma
Date: Thu, 29 Mar 2018 15:10:54 +0200 [thread overview]
Message-ID: <20180329131054.22506-1-peda@axentia.se> (raw)
On a sama5d31 with a Full-HD dual LVDS panel (132MHz pixel clock) NAND
flash accesses have a tendency to cause display disturbances. Add a
module param to disable DMA from the NAND controller, since that fixes
the display problem for me.
Signed-off-by: Peter Rosin <peda@axentia.se>
---
drivers/mtd/nand/raw/atmel/nand-controller.c | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)
diff --git a/drivers/mtd/nand/raw/atmel/nand-controller.c b/drivers/mtd/nand/raw/atmel/nand-controller.c
index b2f00b398490..2ff7a77c7b8e 100644
--- a/drivers/mtd/nand/raw/atmel/nand-controller.c
+++ b/drivers/mtd/nand/raw/atmel/nand-controller.c
@@ -129,6 +129,11 @@
#define DEFAULT_TIMEOUT_MS 1000
#define MIN_DMA_LEN 128
+static bool atmel_nand_avoid_dma __read_mostly;
+
+MODULE_PARM_DESC(avoiddma, "Avoid using DMA");
+module_param_named(avoiddma, atmel_nand_avoid_dma, bool, 0400);
+
enum atmel_nand_rb_type {
ATMEL_NAND_NO_RB,
ATMEL_NAND_NATIVE_RB,
@@ -1977,7 +1982,7 @@ static int atmel_nand_controller_init(struct atmel_nand_controller *nc,
return ret;
}
- if (nc->caps->has_dma) {
+ if (nc->caps->has_dma && !atmel_nand_avoid_dma) {
dma_cap_mask_t mask;
dma_cap_zero(mask);
--
2.11.0
next reply other threads:[~2018-03-29 13:11 UTC|newest]
Thread overview: 57+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-03-29 13:10 Peter Rosin [this message]
2018-03-29 13:33 ` [PATCH] mtd: nand: raw: atmel: add module param to avoid using dma Boris Brezillon
2018-03-29 13:37 ` Peter Rosin
2018-03-29 13:44 ` Boris Brezillon
2018-03-29 14:27 ` Peter Rosin
2018-03-30 21:43 ` Peter Rosin
2018-04-02 12:22 ` Boris Brezillon
2018-04-02 17:59 ` Peter Rosin
2018-04-02 19:28 ` Boris Brezillon
2018-04-02 20:20 ` Boris Brezillon
2018-04-02 20:32 ` Boris Brezillon
2018-04-03 6:11 ` Peter Rosin
2018-04-03 7:18 ` Boris Brezillon
2018-04-11 14:44 ` Peter Rosin
2018-04-11 14:59 ` Boris Brezillon
2018-04-11 15:10 ` Peter Rosin
2018-04-11 15:34 ` Boris Brezillon
2018-04-11 15:34 ` Nicolas Ferre
2018-04-12 7:18 ` Peter Rosin
2018-05-22 18:03 ` Peter Rosin
2018-05-23 10:42 ` Boris Brezillon
2018-05-25 14:51 ` Tudor Ambarus
2018-05-26 17:40 ` Peter Rosin
2018-05-27 9:18 ` Peter Rosin
2018-05-27 22:11 ` Peter Rosin
2018-05-28 10:10 ` Peter Rosin
2018-05-28 14:27 ` Boris Brezillon
2018-05-28 15:52 ` Peter Rosin
2018-05-28 16:09 ` Boris Brezillon
2018-05-28 16:09 ` Nicolas Ferre
2018-05-29 6:30 ` Eugen Hristev
2018-05-29 7:10 ` Peter Rosin
2018-05-29 7:25 ` Eugen Hristev
2018-05-29 14:49 ` Boris Brezillon
2018-05-29 15:01 ` Eugen Hristev
2018-05-29 15:15 ` Boris Brezillon
2018-05-29 15:21 ` Eugen Hristev
2018-05-29 15:46 ` Boris Brezillon
2018-05-29 17:57 ` Boris Brezillon
2018-05-29 21:37 ` Peter Rosin
2018-06-04 15:46 ` Tudor Ambarus
2018-06-04 16:03 ` Boris Brezillon
2018-04-03 6:51 ` Peter Rosin
2018-04-03 7:15 ` Boris Brezillon
2018-04-03 7:32 ` Boris Brezillon
2018-04-03 8:14 ` Peter Rosin
2018-04-03 8:30 ` Boris Brezillon
2018-04-02 20:23 ` Peter Rosin
2018-04-02 20:35 ` Boris Brezillon
2018-04-03 7:18 ` Alexandre Belloni
2018-04-03 8:37 ` Peter Rosin
2018-03-29 14:20 ` Nicolas Ferre
2018-03-29 14:23 ` Peter Rosin
2018-03-29 14:29 ` Boris Brezillon
2018-06-18 8:39 ` Boris Brezillon
2018-06-18 14:00 ` Miquel Raynal
2018-06-25 12:31 ` Miquel Raynal
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