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spi: tegra20_slink: accept any word length

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Original t20 slink could work with commands only
fully divisible by 8. This patch removes such
restriction, so commands of any bitlength now
can be passed and processed.

Tested-by: Andreas Westman Dorcsak <hedmoo@yahoo.com> # ASUS TF600T T30
Tested-by: Svyatoslav Ryhel <clamor95@gmail.com> # LG P895 T30
Tested-by: Thierry Reding <treding@nvidia.com> # T30 and T124
Signed-off-by: Svyatoslav Ryhel <clamor95@gmail.com>
Signed-off-by: Tom <twarren@nvidia.com>
This commit is contained in:
Svyatoslav Ryhel 2023-02-14 19:35:29 +02:00 committed by Tom
parent 23d24df34c
commit 09ca4d8028
1 changed files with 11 additions and 8 deletions
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19
drivers/spi/tegra20_slink.c
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@ -208,16 +208,14 @@ static int tegra30_spi_xfer(struct udevice *dev, unsigned int bitlen,
u32 reg, tmpdout, tmpdin = 0;
const u8 *dout = data_out;
u8 *din = data_in;
int num_bytes;
int ret;
int num_bytes, overflow;
int ret = 0;
debug("%s: slave %u:%u dout %p din %p bitlen %u\n",
__func__, dev_seq(bus), spi_chip_select(dev), dout, din, bitlen);
if (bitlen % 8)
return -1;
num_bytes = bitlen / 8;
ret = 0;
num_bytes = DIV_ROUND_UP(bitlen, 8);
overflow = bitlen % 8;
reg = readl(&regs->status);
writel(reg, &regs->status); /* Clear all SPI events via R/W */
@ -254,8 +252,13 @@ static int tegra30_spi_xfer(struct udevice *dev, unsigned int bitlen,
num_bytes -= bytes;
clrsetbits_le32(&regs->command, SLINK_CMD_BIT_LENGTH_MASK,
bytes * 8 - 1);
if (overflow && !num_bytes)
clrsetbits_le32(&regs->command, SLINK_CMD_BIT_LENGTH_MASK,
(bytes - 1) * 8 + overflow - 1);
else
clrsetbits_le32(&regs->command, SLINK_CMD_BIT_LENGTH_MASK,
bytes * 8 - 1);
writel(tmpdout, &regs->tx_fifo);
setbits_le32(&regs->command, SLINK_CMD_GO);