[PATCH v2] si2157: unknown chip version Si2147-A30 ROM 0x50

[Piotr Chmura <chmooreck@gmail.com>]

Fix firmware file names assignment in si2157 tuner, allow for running 
devices without firmware files needed.


It's regression in kernel 5.17.0, worked fine in 5.16 series.

device: 07ca:1871 AVerMedia Technologies, Inc. TD310 DVB-T/T2/C dongle
modprobe gives error: unknown chip version Si2147-A30 ROM 0x50
Device initialization is interrupted.

caused by:
1. table si2157_tuners has swapped fields rom_id and required vs struct 
si2157_tuner_info.
2. both firmware file names can be null for devices with required == 
false - device uses build-in firmware in this case

Fix:
1. Rearrange fields in table si2157_tuners
2. Allow both firmware file names be NULL for devices defined with 
required == false


Fixes: 1c35ba3bf972 ("media: si2157: use a different namespace for 
firmware")
Link: https://bugzilla.kernel.org/show_bug.cgi?id=215726
Link: 
https://lore.kernel.org/lkml/5f660108-8812-383c-83e4-29ee0558d623@leemhuis.info/
Cc: stable@vger.kernel.org # 5.17.x
Signed-of-by: Piotr Chmura <chmooreck@poczta.onet.pl>
Tested-by: Robert Schlabbach <robert_s@gmx.net>

---

--- a/drivers/media/tuners/si2157.c    2022-03-20 21:14:17.000000000 +0100
+++ b/drivers/media/tuners/si2157.c    2022-03-22 23:48:05.604408331 +0100
@@ -77,16 +77,16 @@ err_mutex_unlock:
  }

  static const struct si2157_tuner_info si2157_tuners[] = {
-    { SI2141, false, 0x60, SI2141_60_FIRMWARE, SI2141_A10_FIRMWARE },
-    { SI2141, false, 0x61, SI2141_61_FIRMWARE, SI2141_A10_FIRMWARE },
-    { SI2146, false, 0x11, SI2146_11_FIRMWARE, NULL },
-    { SI2147, false, 0x50, SI2147_50_FIRMWARE, NULL },
-    { SI2148, true,  0x32, SI2148_32_FIRMWARE, SI2158_A20_FIRMWARE },
-    { SI2148, true,  0x33, SI2148_33_FIRMWARE, SI2158_A20_FIRMWARE },
-    { SI2157, false, 0x50, SI2157_50_FIRMWARE, SI2157_A30_FIRMWARE },
-    { SI2158, false, 0x50, SI2158_50_FIRMWARE, SI2158_A20_FIRMWARE },
-    { SI2158, false, 0x51, SI2158_51_FIRMWARE, SI2158_A20_FIRMWARE },
-    { SI2177, false, 0x50, SI2177_50_FIRMWARE, SI2157_A30_FIRMWARE },
+    { SI2141, 0x60, false, SI2141_60_FIRMWARE, SI2141_A10_FIRMWARE },
+    { SI2141, 0x61, false, SI2141_61_FIRMWARE, SI2141_A10_FIRMWARE },
+    { SI2146, 0x11, false, SI2146_11_FIRMWARE, NULL },
+    { SI2147, 0x50, false, SI2147_50_FIRMWARE, NULL },
+    { SI2148, 0x32, true,  SI2148_32_FIRMWARE, SI2158_A20_FIRMWARE },
+    { SI2148, 0x33, true,  SI2148_33_FIRMWARE, SI2158_A20_FIRMWARE },
+    { SI2157, 0x50, false, SI2157_50_FIRMWARE, SI2157_A30_FIRMWARE },
+    { SI2158, 0x50, false, SI2158_50_FIRMWARE, SI2158_A20_FIRMWARE },
+    { SI2158, 0x51, false, SI2158_51_FIRMWARE, SI2158_A20_FIRMWARE },
+    { SI2177, 0x50, false, SI2177_50_FIRMWARE, SI2157_A30_FIRMWARE },
  };

  static int si2157_load_firmware(struct dvb_frontend *fe,
@@ -178,7 +178,7 @@ static int si2157_find_and_load_firmware
          }
      }

-    if (!fw_name && !fw_alt_name) {
+    if (required && !fw_name && !fw_alt_name) {
          dev_err(&client->dev,
              "unknown chip version Si21%d-%c%c%c ROM 0x%02x\n",
              part_id, cmd.args[1], cmd.args[3], cmd.args[4], rom_id);