linux-kernel - [PATCH v2] Powerpc 8xx CPM

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Date:	Mon, 24 Sep 2012 08:17:08 +0200
From:	Christophe Leroy <christophe.leroy@....fr>
To:	Alan Cox <alan@...ux.intel.com>,
	Vitaly Bordug <vitb@...nel.crashing.org>,
	Marcelo Tosatti <marcelo@...ck.org>
CC:	linux-kernel@...r.kernel.org, linux-serial@...r.kernel.org,
	linuxppc-dev@...ts.ozlabs.org
Subject: [PATCH v2] Powerpc 8xx CPM_UART desynchronisation

This patch fixes a desynchronisation problem with CPM UART driver on
Powerpc MPC8xx. The problem happens if data is received before the device
is open by the user application.

Signed-off-by: Christophe Leroy <christophe.leroy@....fr>

--- linux-3.5-vanilla/drivers/tty/serial/cpm_uart/cpm_uart_core.c	2012-07-21 22:58:29.000000000 +0200
+++ linux-3.5/drivers/tty/serial/cpm_uart/cpm_uart_core.c	2012-08-09 17:38:37.000000000 +0200
@@ -417,6 +417,7 @@
 			clrbits32(&pinfo->sccp->scc_gsmrl, SCC_GSMRL_ENR);
 			clrbits16(&pinfo->sccp->scc_sccm, UART_SCCM_RX);
 		}
+		cpm_uart_initbd(pinfo);
 		cpm_line_cr_cmd(pinfo, CPM_CR_INIT_TRX);
 	}
 	/* Install interrupt handler. */
--
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