mtd: rawnand: atmel: add module param to avoid using dma
[ Upstream commit efc6362c6f
]
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>
Reviewed-by: Boris Brezillon <boris.brezillon@bootlin.com>
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
pull/10/head
parent
a838008bb1
commit
8cbb2f74c0
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@ -129,6 +129,11 @@
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#define DEFAULT_TIMEOUT_MS 1000
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#define MIN_DMA_LEN 128
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static bool atmel_nand_avoid_dma __read_mostly;
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MODULE_PARM_DESC(avoiddma, "Avoid using DMA");
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module_param_named(avoiddma, atmel_nand_avoid_dma, bool, 0400);
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enum atmel_nand_rb_type {
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ATMEL_NAND_NO_RB,
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ATMEL_NAND_NATIVE_RB,
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@ -1975,7 +1980,7 @@ static int atmel_nand_controller_init(struct atmel_nand_controller *nc,
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return ret;
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}
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if (nc->caps->has_dma) {
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if (nc->caps->has_dma && !atmel_nand_avoid_dma) {
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dma_cap_mask_t mask;
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dma_cap_zero(mask);
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