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spi: aspeed: Workaround AST2500 limitations

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It is not possible to configure a full 128MB window for a chip of the
same size on the AST2500 SPI controller. For this case, the maximum
window size is restricted to 120MB for CE0.

Reviewed-by: Joel Stanley <joel@jms.id.au>
Tested-by: Joel Stanley <joel@jms.id.au>
Tested-by: Tao Ren <rentao.bupt@gmail.com>
Tested-by: Jae Hyun Yoo <quic_jaehyoo@quicinc.com>
Signed-off-by: Cédric Le Goater <clg@kaod.org>
Link: https://lore.kernel.org/r/20220509175616.1089346-7-clg@kaod.org
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Cédric Le Goater 2022-05-09 19:56:11 +02:00 committed by Mark Brown
parent bb084f94e1
commit 5785eedee4
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GPG Key ID: 24D68B725D5487D0
1 changed files with 12 additions and 0 deletions
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12
drivers/spi/spi-aspeed-smc.c
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@ -451,6 +451,8 @@ static int aspeed_spi_set_window(struct aspeed_spi *aspi,
* - ioremap each window, not strictly necessary since the overall window
* is correct.
*/
static const struct aspeed_spi_data ast2500_spi_data;
static int aspeed_spi_chip_adjust_window(struct aspeed_spi_chip *chip,
u32 local_offset, u32 size)
{
@ -459,6 +461,16 @@ static int aspeed_spi_chip_adjust_window(struct aspeed_spi_chip *chip,
struct aspeed_spi_window *win = &windows[chip->cs];
int ret;
/*
* Due to an HW issue on the AST2500 SPI controller, the CE0
* window size should be smaller than the maximum 128MB.
*/
if (aspi->data == &ast2500_spi_data && chip->cs == 0 && size == SZ_128M) {
size = 120 << 20;
dev_info(aspi->dev, "CE%d window resized to %dMB (AST2500 HW quirk)",
chip->cs, size >> 20);
}
aspeed_spi_get_windows(aspi, windows);
/* Adjust this chip window */