From 78b2b911bf7020359a2adb54adfca522cf776141 Mon Sep 17 00:00:00 2001 From: Linus Walleij Date: Thu, 16 Jun 2011 10:14:46 +0200 Subject: [PATCH] spi/pl022: strengthen FIFO watermark level checks The platform configuration can select custom FIFO watermarks, but these may conflict the actual FIFO size of the PL022 variant if set too high. So strengthen the sanity checks to deny any conflicting settings. Signed-off-by: Linus Walleij Signed-off-by: Grant Likely --- drivers/spi/spi-pl022.c | 48 ++++++++++++++++++++++++++++++++++++++++++++---- 1 file changed, 44 insertions(+), 4 deletions(-) diff --git a/drivers/spi/spi-pl022.c b/drivers/spi/spi-pl022.c index 5079ff1..77ffd18 100644 --- a/drivers/spi/spi-pl022.c +++ b/drivers/spi/spi-pl022.c @@ -1678,17 +1678,57 @@ static int verify_controller_parameters(struct pl022 *pl022, "Communication mode is configured incorrectly\n"); return -EINVAL; } - if ((chip_info->rx_lev_trig < SSP_RX_1_OR_MORE_ELEM) - || (chip_info->rx_lev_trig > SSP_RX_32_OR_MORE_ELEM)) { + switch (chip_info->rx_lev_trig) { + case SSP_RX_1_OR_MORE_ELEM: + case SSP_RX_4_OR_MORE_ELEM: + case SSP_RX_8_OR_MORE_ELEM: + /* These are always OK, all variants can handle this */ + break; + case SSP_RX_16_OR_MORE_ELEM: + if (pl022->vendor->fifodepth < 16) { + dev_err(&pl022->adev->dev, + "RX FIFO Trigger Level is configured incorrectly\n"); + return -EINVAL; + } + break; + case SSP_RX_32_OR_MORE_ELEM: + if (pl022->vendor->fifodepth < 32) { + dev_err(&pl022->adev->dev, + "RX FIFO Trigger Level is configured incorrectly\n"); + return -EINVAL; + } + break; + default: dev_err(&pl022->adev->dev, "RX FIFO Trigger Level is configured incorrectly\n"); return -EINVAL; + break; } - if ((chip_info->tx_lev_trig < SSP_TX_1_OR_MORE_EMPTY_LOC) - || (chip_info->tx_lev_trig > SSP_TX_32_OR_MORE_EMPTY_LOC)) { + switch (chip_info->tx_lev_trig) { + case SSP_TX_1_OR_MORE_EMPTY_LOC: + case SSP_TX_4_OR_MORE_EMPTY_LOC: + case SSP_TX_8_OR_MORE_EMPTY_LOC: + /* These are always OK, all variants can handle this */ + break; + case SSP_TX_16_OR_MORE_EMPTY_LOC: + if (pl022->vendor->fifodepth < 16) { + dev_err(&pl022->adev->dev, + "TX FIFO Trigger Level is configured incorrectly\n"); + return -EINVAL; + } + break; + case SSP_TX_32_OR_MORE_EMPTY_LOC: + if (pl022->vendor->fifodepth < 32) { + dev_err(&pl022->adev->dev, + "TX FIFO Trigger Level is configured incorrectly\n"); + return -EINVAL; + } + break; + default: dev_err(&pl022->adev->dev, "TX FIFO Trigger Level is configured incorrectly\n"); return -EINVAL; + break; } if (chip_info->iface == SSP_INTERFACE_NATIONAL_MICROWIRE) { if ((chip_info->ctrl_len < SSP_BITS_4) -- 2.7.4