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received-spf: None (protection.outlook.com: microsoft.com does not designate permitted sender hosts) authentication-results: spf=none (sender IP is ) smtp.mailfrom=Alexander.Levin@microsoft.com; x-microsoft-antispam-message-info: 0EpQ5i+USrSlqxmoUvG0hwB4AyDzpX+c9qWoICSExMyLfHtorRsvHwkY2xSfCiPm1dJF7lhOMOZzRCLv/GE/uvUOdZwy1/kRcQaECA+U3QLMttHebiF+aoyYzcyWNkkJ6QB9nL0L5wmFcVO141z+lqz6sUoqf6mrbLUZaKZ2E55xjiMNQJSYnRWNNjW8NsxIQHjwsqsUtgmMQTjohkg+ii9niB5VWg2oMQwqJ8EFH+LVIxmkcFAk7SB90HH2SA+nvk4XLN8cE0QbE3o1YG1/en+J1fODpBgzm2o7GHhLkqXds4bwIEuM7p9cOeOXSBFgtDBZ/hzfmhj01TLuMwEgRpcwfXmOFVbzHqUMohWyZSg= spamdiagnosticoutput: 1:99 spamdiagnosticmetadata: NSPM Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: microsoft.com X-MS-Exchange-CrossTenant-Network-Message-Id: 3739ce6f-9433-4a4a-e67c-08d61c4a4220 X-MS-Exchange-CrossTenant-originalarrivaltime: 17 Sep 2018 03:02:52.9467 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 72f988bf-86f1-41af-91ab-2d7cd011db47 X-MS-Exchange-Transport-CrossTenantHeadersStamped: CY4PR21MB0776 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Peter Rosin [ Upstream commit efc6362c6f8c1e74b340e2611f1b35e7d557ce7b ] 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 Reviewed-by: Boris Brezillon Signed-off-by: Miquel Raynal Signed-off-by: Sasha Levin --- drivers/mtd/nand/atmel/nand-controller.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/drivers/mtd/nand/atmel/nand-controller.c b/drivers/mtd/nand/at= mel/nand-controller.c index 68c9d98a3347..148744418e82 100644 --- a/drivers/mtd/nand/atmel/nand-controller.c +++ b/drivers/mtd/nand/atmel/nand-controller.c @@ -129,6 +129,11 @@ #define DEFAULT_TIMEOUT_MS 1000 #define MIN_DMA_LEN 128 =20 +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, @@ -1975,7 +1980,7 @@ static int atmel_nand_controller_init(struct atmel_na= nd_controller *nc, return ret; } =20 - if (nc->caps->has_dma) { + if (nc->caps->has_dma && !atmel_nand_avoid_dma) { dma_cap_mask_t mask; =20 dma_cap_zero(mask); --=20 2.17.1