From patchwork Tue Aug 14 14:26:26 2012
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Subject: Powerpc 8xx CPM_UART desynchronisation
Date: Tue, 14 Aug 2012 04:26:26 -0000
From: LEROY Christophe <christophe.leroy@c-s.fr>
X-Patchwork-Id: 177346
Message-Id: <201208141426.q7EEQQmD003947@localhost.localdomain>
To: Alan Cox <alan@linux.intel.com>, Vitaly Bordug <vitb@kernel.crashing.org>, 
 Marcelo Tosatti <marcelo@kvack.org>
Cc: linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org,
 linux-serial@vger.kernel.org

Hello,

I'm not sure who to address this Patch to.

It 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@c-s.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. */