From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Clifford T. Matthews" Subject: [PATCH] 16bpp bugfix for CL-GD7548 Cirrus frame buffer Date: Sun, 8 Dec 2002 01:12:55 -0700 Sender: linux-kernel-owner@vger.kernel.org Message-ID: <15858.65287.855121.801382@newbie.ardi.com> Mime-Version: 1.0 Content-Transfer-Encoding: 7bit Return-path: List-Id: Cc: linux-fbdev-devel@lists.sourceforge.net, linux-kernel@vger.kernel.org I have a Micron Millennium Transport laptop with Cirrus CL-GD7548 based video. It works fine in 16bpp using the Cirrus XFree86 4.2.0 driver. /dev/fb works fine at 8bpp, but didn't work at 16bpp. I looked at the two drivers and made clgenfb.c do a few things the XFree86 driver was doing and now 16bpp appears to work fine on that laptop. I don't subscribe to linux-fbdev-devel, but do read lkml via a leisurely Usenet feed. --Cliff Matthews After some people managed to scale the wall, ctm@ardi.com there was a ban on the sale of rope and twine. diff -Naur linux-2.4.20/drivers/video/clgenfb.c linux-2.4.20-clpatch/drivers/video/clgenfb.c --- linux-2.4.20/drivers/video/clgenfb.c 2002-11-28 16:53:15.000000000 -0700 +++ linux-2.4.20-clpatch/drivers/video/clgenfb.c 2002-12-07 23:34:54.000000000 -0700 @@ -15,6 +15,9 @@ * Lars Hecking: * Amiga updates and testing. * + * Cliff Matthews : + * 16bpp fix for CL-GD7548 (uses info from XFree86 4.2.0 source) + * * Original clgenfb author: Frank Neumann * * Based on retz3fb.c and clgen.c: @@ -403,6 +406,9 @@ #ifdef CONFIG_PCI struct pci_dev *pdev; +#define IS_7548(x) ((x)->pdev->device == PCI_DEVICE_ID_CIRRUS_7548) +#else +#define IS_7548(x) (FALSE) #endif }; @@ -970,7 +976,10 @@ DPRINTK ("desired pixclock: %ld kHz\n", freq); - maxclock = clgen_board_info[fb_info->btype].maxclock; + if (IS_7548(fb_info)) + maxclock = 80100; + else + maxclock = clgen_board_info[fb_info->btype].maxclock; _par->multiplexing = 0; /* If the frequency is greater than we can support, we might be able @@ -1478,10 +1487,17 @@ case BT_ALPINE: DPRINTK (" (for GD543x)\n"); - if (_par->HorizRes >= 1024) - vga_wseq (fb_info->regs, CL_SEQR7, 0xa7); - else - vga_wseq (fb_info->regs, CL_SEQR7, 0xa3); + if (IS_7548(fb_info)) { + vga_wseq (fb_info->regs, CL_SEQR7, + (vga_rseq (fb_info->regs, CL_SEQR7) & 0xE0) + | 0x17); + WHDR (fb_info, 0xC1); + } else { + if (_par->HorizRes >= 1024) + vga_wseq (fb_info->regs, CL_SEQR7, 0xa7); + else + vga_wseq (fb_info->regs, CL_SEQR7, 0xa3); + } clgen_set_mclk (fb_info, _par->mclk, _par->divMCLK); break; @@ -1594,6 +1610,11 @@ _par->var.bits_per_pixel); } + if (IS_7548(fb_info)) { + vga_wseq (fb_info->regs, CL_SEQR2D, + vga_rseq (fb_info->regs, CL_SEQR2D) | 0xC0); + } + vga_wcrt (fb_info->regs, VGA_CRTC_OFFSET, offset & 0xff); tmp = 0x22; if (offset & 0x100) diff -Naur linux-2.4.20/drivers/video/clgenfb.h linux-2.4.20-clpatch/drivers/video/clgenfb.h --- linux-2.4.20/drivers/video/clgenfb.h 2000-01-06 11:23:46.000000000 -0700 +++ linux-2.4.20-clpatch/drivers/video/clgenfb.h 2002-12-07 20:50:43.000000000 -0700 @@ -60,6 +60,7 @@ #define CL_SEQR1D 0x1d /* VCLK2 Denominator and Post-Scalar Value */ #define CL_SEQR1E 0x1e /* VCLK3 Denominator and Post-Scalar Value */ #define CL_SEQR1F 0x1f /* BIOS ROM write enable and MCLK Select */ +#define CL_SEQR2D 0x2d /* unknown, snagged from XFree86 4.2.0 */ /*** CRT Controller Registers ***/ #define CL_CRT22 0x22 /* Graphics Data Latches ReadBack */