linux-kernel - [PATCH 4.9 41/67] cx231xx: Fix I2C on Internal Master 3 Bus

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Date:   Mon,  6 Nov 2017 10:44:04 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Oleh Kravchenko <oleg@....org.ua>,
        Mauro Carvalho Chehab <mchehab@...pensource.com>,
        Sasha Levin <alexander.levin@...izon.com>
Subject: [PATCH 4.9 41/67] cx231xx: Fix I2C on Internal Master 3 Bus

4.9-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Oleh Kravchenko <oleg@....org.ua>


[ Upstream commit 6c5da8031a3abfad259190d35f83d89568b72ee2 ]

Internal Master 3 Bus can send and receive only 4 bytes per time.

Signed-off-by: Oleh Kravchenko <oleg@....org.ua>
Signed-off-by: Mauro Carvalho Chehab <mchehab@...pensource.com>
Signed-off-by: Sasha Levin <alexander.levin@...izon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/media/usb/cx231xx/cx231xx-core.c |    7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

--- a/drivers/media/usb/cx231xx/cx231xx-core.c
+++ b/drivers/media/usb/cx231xx/cx231xx-core.c
@@ -356,7 +356,12 @@ int cx231xx_send_vendor_cmd(struct cx231
 	 */
 	if ((ven_req->wLength > 4) && ((ven_req->bRequest == 0x4) ||
 					(ven_req->bRequest == 0x5) ||
-					(ven_req->bRequest == 0x6))) {
+					(ven_req->bRequest == 0x6) ||
+
+					/* Internal Master 3 Bus can send
+					 * and receive only 4 bytes per time
+					 */
+					(ven_req->bRequest == 0x2))) {
 		unsend_size = 0;
 		pdata = ven_req->pBuff;