CPM1: Don't send break on TX_STOP, don't interrupt RX/TX when adjusting termios parameters

From: Nye Liu <[email protected]>

Before setting STOP_TX, set _brkcr to 0 so the SMC does not send a break character. The driver appears to properly re-initialize _brkcr when the SMC is restarted.

Do not interrupt RX/TX when the termios is being adjusted; it results in corrupted characters appearing on the line.

---

index a19dc7e..babd06b 100644
@@ -476,10 +476,13 @@ static void cpm_uart_shutdown(struct uart_port *port)

		}

		/* Shut them really down and reinit buffer descriptors */
-		if (IS_SMC(pinfo))
+		if (IS_SMC(pinfo)) {
+			out_be16(&pinfo->smcup->smc_brkcr, 0);
			cpm_line_cr_cmd(pinfo, CPM_CR_STOP_TX);
-		else
+		} else {
+			out_be16(&pinfo->sccup->scc_brkcr, 0);
			cpm_line_cr_cmd(pinfo, CPM_CR_GRA_STOP_TX);

+ }

		cpm_uart_initbd(pinfo);
	}

@@ -590,9 +593,11 @@ static void cpm_uart_set_termios(struct uart_port *port,
* enables, because we want to put them back if they were
* present.
*/
- prev_mode = in_be16(&smcp->smc_smcmr);
- out_be16(&smcp->smc_smcmr, smcr_mk_clen(bits) | cval | SMCMR_SM_UART);
- setbits16(&smcp->smc_smcmr, (prev_mode & (SMCMR_REN | SMCMR_TEN)));
+ prev_mode = in_be16(&smcp->smc_smcmr) & (SMCMR_REN | SMCMR_TEN);
+ /* Output in *one* operation, so we don't interrupt RX/TX if they
+ * were already enabled. */
+ out_be16(&smcp->smc_smcmr, smcr_mk_clen(bits) | cval |

+		    SMCMR_SM_UART | prev_mode);
	} else {
		out_be16(&sccp->scc_psmr, (sbits << 12) | scval);
	}
@@ -1324,12 +1329,14 @@ static int __init cpm_uart_console_setup(struct console *co, char *options)
	udbg_putc = NULL;

#endif

- cpm_line_cr_cmd(pinfo, CPM_CR_STOP_TX);
-

	if (IS_SMC(pinfo)) {
+		out_be16(&pinfo->smcup->smc_brkcr, 0);
+		cpm_line_cr_cmd(pinfo, CPM_CR_STOP_TX);
		clrbits8(&pinfo->smcp->smc_smcm, SMCM_RX | SMCM_TX);
		clrbits16(&pinfo->smcp->smc_smcmr, SMCMR_REN | SMCMR_TEN);
	} else {
+		out_be16(&pinfo->sccup->scc_brkcr, 0);
+		cpm_line_cr_cmd(pinfo, CPM_CR_GRA_STOP_TX);
		clrbits16(&pinfo->sccp->scc_sccm, UART_SCCM_TX | UART_SCCM_RX);
		clrbits32(&pinfo->sccp->scc_gsmrl, SCC_GSMRL_ENR | SCC_GSMRL_ENT);
	}

Nye Liu
[email protected]
(818) 772-6235x248
(818) 772-0576 fax

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	-- Don Quixote