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Date:   Thu, 3 Oct 2019 08:17:42 -0300
From:   Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
To:     Gonsolo <gonsolo@gmail.com>
Cc:     JP <jp@jpvw.nl>, crope@iki.fi, Sean Young <sean@mess.org>,
        linux-media@vger.kernel.org,
        Linux Kernel <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH] si2157: Add support for Logilink VG0022A.
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Em Thu, 3 Oct 2019 12:57:50 +0200
Gonsolo <gonsolo@gmail.com> escreveu:

> Hi!
> 
> Boot time:
> 
> > [    5.380991] si2168 1-0067: firmware version: B 4.0.2  
> 
> When starting VLC:
> 
> > [  457.677363] si2168 1-0067: downloading firmware from file
> > 'dvb-demod-si2168-b40-01.fw'
> > [  458.631034] si2168 1-0067: firmware version: B 4.0.11
> > [  458.650309] si2157 2-0063: unknown chip version Si21255-\xff\xff\xff  
> 
> There are two different firmware versions, 4.0.2 and 4.0.11. Is that expected?

It means that there's a firmware stored at the device's eeprom
(version 4.0.2). When the driver starts, it downloads a newer firmware
from the file dvb-demod-si2168-b40-01.fw.

Btw, could you please try the enclosed hack and post the results?

Thanks,
Mauro

diff --git a/drivers/media/tuners/si2157.c b/drivers/media/tuners/si2157.c
index e87040d6eca7..3ccfd602934b 100644
--- a/drivers/media/tuners/si2157.c
+++ b/drivers/media/tuners/si2157.c
@@ -76,6 +76,7 @@ static int si2157_init(struct dvb_frontend *fe)
 	const struct firmware *fw;
 	const char *fw_name;
 	unsigned int uitmp, chip_id;
+	int i;
 
 	dev_dbg(&client->dev, "\n");
 
@@ -118,16 +119,32 @@ static int si2157_init(struct dvb_frontend *fe)
 			goto err;
 	}
 
-	/* query chip revision */
-	memcpy(cmd.args, "\x02", 1);
-	cmd.wlen = 1;
-	cmd.rlen = 13;
-	ret = si2157_cmd_execute(client, &cmd);
-	if (ret)
-		goto err;
+	for (i = 0; i < 10; i++) {
+		/* query chip revision */
+		memcpy(cmd.args, "\x02", 1);
+		cmd.wlen = 1;
+		cmd.rlen = 13;
+		ret = si2157_cmd_execute(client, &cmd);
+		if (ret)
+			goto err;
+
+		chip_id = cmd.args[1] << 24 | cmd.args[2] << 16 | cmd.args[3] << 8 |
+			  cmd.args[4] << 0;
 
-	chip_id = cmd.args[1] << 24 | cmd.args[2] << 16 | cmd.args[3] << 8 |
-			cmd.args[4] << 0;
+		if (chip_id != 0xffffffff)
+			break;
+
+		msleep(10);
+	}
+
+	if (i)
+		dev_info(&client->dev, "Needed to wait %i ms to get chip version", i * 10);
+
+	if (chip_id == 0xffffffff) {
+		dev_err(&client->dev, "Unable to retrieve chip version\n");
+		ret = -EINVAL;
+		goto err;
+	}
 
 	#define SI2177_A30 ('A' << 24 | 77 << 16 | '3' << 8 | '0' << 0)
 	#define SI2158_A20 ('A' << 24 | 58 << 16 | '2' << 8 | '0' << 0)