From: Jens Rottmann <JRottmann@LiPPERT-AT.de>
To: Antonino Daplas <adaplas@gmail.com>
Cc: linux-fbdev-devel@lists.sourceforge.net
Subject: [PATCH] lxfb: extend PLL table to support dotclocks below 25 MHz
Date: Mon, 28 Jan 2008 14:00:27 +0100 [thread overview]
Message-ID: <479DD1EB.2070202@LiPPERT-AT.de> (raw)
Hi,
I needed this to use a 320x240 TFT (Sharp LQ038Q5DR01, 6.8 MHz dotclock) on a
AMD Geode-LX board. Tested with 2.6.23.14 and 2.6.24.
What do you think?
Best regards,
Jens Rottmann
------------------X8-----------------X8-------------------------
lxfb: extend PLL table to support dotclocks below 25 MHz
Extends the PLL frequency table of the AMD Geode-LX frame buffer
driver to make use of the DIV4 bit, thus adding support for
dotclocks between 6 and 25 MHz. These are needed for small LCDs
(e.g. 320x240). Also inserts some intermediate steps between
pre-existing frequencies.
Signed-off-by: Jens Rottmann <JRottmann at LiPPERT-AT. de>
---
--- linux-2.6.24/drivers/video/geode/lxfb_ops.c
+++ lxfb_clocks_added/drivers/video/geode/lxfb_ops.c
@@ -34,35 +34,85 @@ static const struct {
unsigned int pllval;
unsigned int freq;
} pll_table[] = {
- { 0x000031AC, 24923 },
- { 0x0000215D, 25175 },
- { 0x00001087, 27000 },
- { 0x0000216C, 28322 },
- { 0x0000218D, 28560 },
- { 0x000010C9, 31200 },
- { 0x00003147, 31500 },
- { 0x000010A7, 33032 },
- { 0x00002159, 35112 },
- { 0x00004249, 35500 },
- { 0x00000057, 36000 },
- { 0x0000219A, 37889 },
- { 0x00002158, 39168 },
- { 0x00000045, 40000 },
- { 0x00000089, 43163 },
- { 0x000010E7, 44900 },
- { 0x00002136, 45720 },
- { 0x00003207, 49500 },
- { 0x00002187, 50000 },
- { 0x00004286, 56250 },
- { 0x000010E5, 60065 },
- { 0x00004214, 65000 },
- { 0x00001105, 68179 },
- { 0x000031E4, 74250 },
- { 0x00003183, 75000 },
- { 0x00004284, 78750 },
- { 0x00001104, 81600 },
- { 0x00006363, 94500 },
- { 0x00005303, 97520 },
+ { 0x000131AC, 6231 },
+ { 0x0001215D, 6294 },
+ { 0x00011087, 6750 },
+ { 0x0001216C, 7081 },
+ { 0x0001218D, 7140 },
+ { 0x000110C9, 7800 },
+ { 0x00013147, 7875 },
+ { 0x000110A7, 8258 },
+ { 0x00012159, 8778 },
+ { 0x00014249, 8875 },
+ { 0x00010057, 9000 },
+ { 0x0001219A, 9472 },
+ { 0x00012158, 9792 },
+ { 0x00010045, 10000 },
+ { 0x00010089, 10791 },
+ { 0x000110E7, 11225 },
+ { 0x00012136, 11430 },
+ { 0x00013207, 12375 },
+ { 0x00012187, 12500 },
+ { 0x00014286, 14063 },
+ { 0x000110E5, 15016 },
+ { 0x00014214, 16250 },
+ { 0x00011105, 17045 },
+ { 0x000131E4, 18563 },
+ { 0x00013183, 18750 },
+ { 0x00014284, 19688 },
+ { 0x00011104, 20400 },
+ { 0x00016363, 23625 },
+ { 0x00015303, 24380 },
+ { 0x000031AC, 24923 },
+ { 0x0000215D, 25175 },
+ { 0x00001087, 27000 },
+ { 0x0000216C, 28322 },
+ { 0x0000218D, 28560 },
+ { 0x00010041, 29913 },
+ { 0x000010C9, 31200 },
+ { 0x00003147, 31500 },
+ { 0x000141A1, 32400 },
+ { 0x000010A7, 33032 },
+ { 0x00012182, 33375 },
+ { 0x000141B1, 33750 },
+ { 0x00002159, 35112 },
+ { 0x00004249, 35500 },
+ { 0x00000057, 36000 },
+ { 0x000141E1, 37125 },
+ { 0x0000219A, 37889 },
+ { 0x00002158, 39168 },
+ { 0x00000045, 40000 },
+ { 0x000131A1, 40500 },
+ { 0x00010061, 42301 },
+ { 0x00000089, 43163 },
+ { 0x00012151, 43875 },
+ { 0x000010E7, 44900 },
+ { 0x00002136, 45720 },
+ { 0x000152E1, 47250 },
+ { 0x00010071, 48000 },
+ { 0x00003207, 49500 },
+ { 0x00002187, 50000 },
+ { 0x00014291, 50625 },
+ { 0x00011101, 51188 },
+ { 0x00017481, 54563 },
+ { 0x00004286, 56250 },
+ { 0x00014170, 57375 },
+ { 0x00016210, 58500 },
+ { 0x000010E5, 60065 },
+ { 0x00013140, 62796 },
+ { 0x00004214, 65000 },
+ { 0x00016250, 65250 },
+ { 0x00001105, 68179 },
+ { 0x000141C0, 69600 },
+ { 0x00015220, 70160 },
+ { 0x00010050, 72000 },
+ { 0x000031E4, 74250 },
+ { 0x00003183, 75000 },
+ { 0x00004284, 78750 },
+ { 0x00012130, 80052 },
+ { 0x00001104, 81600 },
+ { 0x00006363, 94500 },
+ { 0x00005303, 97520 },
{ 0x00002183, 100187 },
{ 0x00002122, 101420 },
{ 0x00001081, 108000 },
@@ -137,7 +187,7 @@ static void lx_set_clock(struct fb_info
unsigned int diff, min, best = 0;
unsigned int freq, i;
- freq = (unsigned int) (0x3b9aca00 / info->var.pixclock);
+ freq = (unsigned int) (1000000000 / info->var.pixclock);
min = abs(pll_table[0].freq - freq);
@@ -149,7 +199,7 @@ static void lx_set_clock(struct fb_info
}
}
- lx_set_dotpll(pll_table[best].pllval & 0x7FFF);
+ lx_set_dotpll(pll_table[best].pllval & 0x00017FFF);
}
static void lx_graphics_disable(struct fb_info *info)
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