diff options
| author | Christophe Leroy <christophe.leroy@c-s.fr> | 2019-05-22 15:17:11 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-08-04 10:34:56 +0300 |
| commit | 63d1bc1d212440c826f584cf259bc8274c9dcaa3 (patch) | |
| tree | 0f225690a996762ad1567bd4a517e03abc89d0d8 | |
| parent | 345f195da4fc020551677d0da4e24d03409cc9db (diff) | |
| download | linux-63d1bc1d212440c826f584cf259bc8274c9dcaa3.tar.xz | |
tty: serial: cpm_uart - fix init when SMC is relocated
[ Upstream commit 06aaa3d066db87e8478522d910285141d44b1e58 ]
SMC relocation can also be activated earlier by the bootloader,
so the driver's behaviour cannot rely on selected kernel config.
When the SMC is relocated, CPM_CR_INIT_TRX cannot be used.
But the only thing CPM_CR_INIT_TRX does is to clear the
rstate and tstate registers, so this can be done manually,
even when SMC is not relocated.
Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Fixes: 9ab921201444 ("cpm_uart: fix non-console port startup bug")
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
| -rw-r--r-- | drivers/tty/serial/cpm_uart/cpm_uart_core.c | 17 |
1 files changed, 11 insertions, 6 deletions
diff --git a/drivers/tty/serial/cpm_uart/cpm_uart_core.c b/drivers/tty/serial/cpm_uart/cpm_uart_core.c index 0040c29f651a..b9e137c03fe3 100644 --- a/drivers/tty/serial/cpm_uart/cpm_uart_core.c +++ b/drivers/tty/serial/cpm_uart/cpm_uart_core.c @@ -421,7 +421,16 @@ static int cpm_uart_startup(struct uart_port *port) clrbits16(&pinfo->sccp->scc_sccm, UART_SCCM_RX); } cpm_uart_initbd(pinfo); - cpm_line_cr_cmd(pinfo, CPM_CR_INIT_TRX); + if (IS_SMC(pinfo)) { + out_be32(&pinfo->smcup->smc_rstate, 0); + out_be32(&pinfo->smcup->smc_tstate, 0); + out_be16(&pinfo->smcup->smc_rbptr, + in_be16(&pinfo->smcup->smc_rbase)); + out_be16(&pinfo->smcup->smc_tbptr, + in_be16(&pinfo->smcup->smc_tbase)); + } else { + cpm_line_cr_cmd(pinfo, CPM_CR_INIT_TRX); + } } /* Install interrupt handler. */ retval = request_irq(port->irq, cpm_uart_int, 0, "cpm_uart", port); @@ -875,16 +884,14 @@ static void cpm_uart_init_smc(struct uart_cpm_port *pinfo) (u8 __iomem *)pinfo->tx_bd_base - DPRAM_BASE); /* - * In case SMC1 is being relocated... + * In case SMC is being relocated... */ -#if defined (CONFIG_I2C_SPI_SMC1_UCODE_PATCH) out_be16(&up->smc_rbptr, in_be16(&pinfo->smcup->smc_rbase)); out_be16(&up->smc_tbptr, in_be16(&pinfo->smcup->smc_tbase)); out_be32(&up->smc_rstate, 0); out_be32(&up->smc_tstate, 0); out_be16(&up->smc_brkcr, 1); /* number of break chars */ out_be16(&up->smc_brkec, 0); -#endif /* Set up the uart parameters in the * parameter ram. @@ -898,8 +905,6 @@ static void cpm_uart_init_smc(struct uart_cpm_port *pinfo) out_be16(&up->smc_brkec, 0); out_be16(&up->smc_brkcr, 1); - cpm_line_cr_cmd(pinfo, CPM_CR_INIT_TRX); - /* Set UART mode, 8 bit, no parity, one stop. * Enable receive and transmit. */ |