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annotate old/linux-2.6.37.6-ftdi_sio.c.patch @ 259:40f44aa49dd0

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linux-2.6.37.6-ftdi_sio.c.patch moved from doc to old
author Mychaela Falconia <falcon@freecalypso.org>
date Thu, 28 Sep 2017 07:55:58 +0000
parents doc/linux-2.6.37.6-ftdi_sio.c.patch@e7502631a0f9
children
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e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
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1 --- ftdi_sio.c.orig 2011-03-27 11:01:41.000000000 -0800
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2 +++ ftdi_sio.c 2015-10-30 13:18:40.879000032 -0800
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3 @@ -949,7 +949,7 @@
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4 static const unsigned char divfrac[8] = { 0, 3, 2, 4, 1, 5, 6, 7 };
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5 __u32 divisor;
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6 /* divisor shifted 3 bits to the left */
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7 - int divisor3 = base / 2 / baud;
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8 + int divisor3 = (base / 2 + baud / 2) / baud;
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9 divisor = divisor3 >> 3;
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10 divisor |= (__u32)divfrac[divisor3 & 0x7] << 14;
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11 /* Deal with special cases for highest baud rates. */
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12 @@ -1087,6 +1087,17 @@
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13 baud = tty_get_baud_rate(tty);
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14 dbg("%s - tty_get_baud_rate reports speed %d", __func__, baud);
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15
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16 + /*
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17 + * FreeCalypso hack: translate non-std high
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18 + * baud rates for GSM like CP2102 does.
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19 + */
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20 + if (baud == 230400)
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21 + baud = 203125;
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22 + else if (baud == 460800)
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23 + baud = 406250;
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24 + else if (baud == 921600)
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25 + baud = 812500;
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26 +
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27 /* 2. Observe async-compatible custom_divisor hack, update baudrate
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28 if needed */
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