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Message-ID: <20060724165602.18822.56823.stgit@cosmic.amd.com>
Date: Mon, 24 Jul 2006 10:56:02 -0600
From: "Jordan Crouse" <jordan.crouse@....com>
To: akpm@...l.org
cc: linux-kernel@...r.kernel.org,
linux-fbdev-devel@...ts.sourceforge.net, blizzard@...hat.com,
dwmw2@...hat.com
Subject: [PATCH 2/4] [PATCH] gxfb: Fixups for the AMD Geode GX
framebuffer driver
From: Jordan Crouse <jordan.crouse@....com>
We cannot assume that the BIOS will be correctly setting up the hardware,
so set some bits in various display registers to enable video output.
Allow an advanced user to specify a frambuffer size, rather then probing
the BIOS. All of these fixes were prompted by the OLPC effort.
Signed-off-by: Jordan Crouse <jordan.crouse@....com>
---
drivers/video/geode/Kconfig | 20 ++++++++++++++++++++
drivers/video/geode/display_gx.c | 7 +++++++
drivers/video/geode/display_gx.h | 1 +
drivers/video/geode/gxfb_core.c | 6 ++++++
drivers/video/geode/video_gx.c | 24 +++++++++++++++++++++++-
drivers/video/geode/video_gx.h | 7 +++++++
6 files changed, 64 insertions(+), 1 deletions(-)
diff --git a/drivers/video/geode/Kconfig b/drivers/video/geode/Kconfig
index 4e173ef..5704879 100644
--- a/drivers/video/geode/Kconfig
+++ b/drivers/video/geode/Kconfig
@@ -23,6 +23,26 @@ config FB_GEODE_GX
If unsure, say N.
+config FB_GEODE_GX_SET_FBSIZE
+ bool "Manually specify the Geode GX framebuffer size"
+ depends on FB_GEODE_GX
+ default n
+ ---help---
+ If you want to manually specify the size of your GX framebuffer,
+ say Y here, otherwise say N to dynamically probe it.
+
+ Say N unless you know what you are doing.
+
+config FB_GEODE_GX_FBSIZE
+ hex "Size of the GX framebuffer, in bytes"
+ depends on FB_GEODE_GX_SET_FBSIZE
+ default "0x1600000"
+ ---help---
+ Specify the size of the GX framebuffer. Normally, you will
+ want this to be MB aligned. Common values are 0x80000 (8MB)
+ and 0x1600000 (16MB). Don't change this unless you know what
+ you are doing
+
config FB_GEODE_GX1
tristate "AMD Geode GX1 framebuffer support (EXPERIMENTAL)"
depends on FB && FB_GEODE && EXPERIMENTAL
diff --git a/drivers/video/geode/display_gx.c b/drivers/video/geode/display_gx.c
index 0245169..7faf62a 100644
--- a/drivers/video/geode/display_gx.c
+++ b/drivers/video/geode/display_gx.c
@@ -21,6 +21,11 @@ #include <asm/delay.h>
#include "geodefb.h"
#include "display_gx.h"
+#ifdef CONFIG_FB_GEODE_GX_SET_FBSIZE
+unsigned int gx_frame_buffer_size(void) {
+ return CONFIG_FB_GEODE_GX_FBSIZE;
+}
+#else
unsigned int gx_frame_buffer_size(void)
{
unsigned int val;
@@ -35,6 +40,7 @@ unsigned int gx_frame_buffer_size(void)
val = (unsigned int)(inw(0xAC1E)) & 0xFFl;
return (val << 19);
}
+#endif
int gx_line_delta(int xres, int bpp)
{
@@ -90,6 +96,7 @@ static void gx_set_mode(struct fb_info *
writel(((info->var.xres * info->var.bits_per_pixel/8) >> 3) + 2,
par->dc_regs + DC_LINE_SIZE);
+
/* Enable graphics and video data and unmask address lines. */
dcfg |= DC_DCFG_GDEN | DC_DCFG_VDEN | DC_DCFG_A20M | DC_DCFG_A18M;
diff --git a/drivers/video/geode/display_gx.h b/drivers/video/geode/display_gx.h
index 41e79f4..e962c76 100644
--- a/drivers/video/geode/display_gx.h
+++ b/drivers/video/geode/display_gx.h
@@ -93,4 +93,5 @@ #define DC_V_SYNC_TIMING 0x58
#define DC_PAL_ADDRESS 0x70
#define DC_PAL_DATA 0x74
+#define DC_GLIU0_MEM_OFFSET 0x84
#endif /* !__DISPLAY_GX1_H__ */
diff --git a/drivers/video/geode/gxfb_core.c b/drivers/video/geode/gxfb_core.c
index a454dcb..742fd04 100644
--- a/drivers/video/geode/gxfb_core.c
+++ b/drivers/video/geode/gxfb_core.c
@@ -240,6 +240,12 @@ static int __init gxfb_map_video_memory(
if (!info->screen_base)
return -ENOMEM;
+ /* Set the 16MB aligned base address of the graphics memory region
+ * in the display controller */
+
+ writel(info->fix.smem_start & 0xFF000000,
+ par->dc_regs + DC_GLIU0_MEM_OFFSET);
+
dev_info(&dev->dev, "%d Kibyte of video memory at 0x%lx\n",
info->fix.smem_len / 1024, info->fix.smem_start);
diff --git a/drivers/video/geode/video_gx.c b/drivers/video/geode/video_gx.c
index 2b2a788..616ce33 100644
--- a/drivers/video/geode/video_gx.c
+++ b/drivers/video/geode/video_gx.c
@@ -178,7 +178,21 @@ static void gx_set_dclk_frequency(struct
static void gx_configure_display(struct fb_info *info)
{
struct geodefb_par *par = info->par;
- u32 dcfg, fp_pm;
+ u32 dcfg, fp_pm, misc;
+
+ /* Set up the MISC register */
+
+ misc = readl(par->vid_regs + GX_MISC);
+
+ /* Power up the DAC */
+ misc &= ~(GX_MISC_A_PWRDN | GX_MISC_DAC_PWRDN);
+
+ /* Disable gamma correction */
+ misc |= GX_MISC_GAM_EN;
+
+ writel(misc, par->vid_regs + GX_MISC);
+
+ /* Write the display configuration */
dcfg = readl(par->vid_regs + GX_DCFG);
@@ -199,9 +213,17 @@ static void gx_configure_display(struct
if (info->var.sync & FB_SYNC_VERT_HIGH_ACT)
dcfg |= GX_DCFG_CRT_VSYNC_POL;
+ /* Enable the display logic */
+ /* Set up the DACS to blank normally */
+
+ dcfg |= GX_DCFG_CRT_EN | GX_DCFG_DAC_BL_EN;
+
+ /* Enable the external DAC VREF? */
+
writel(dcfg, par->vid_regs + GX_DCFG);
/* Power on flat panel. */
+
fp_pm = readl(par->vid_regs + GX_FP_PM);
fp_pm |= GX_FP_PM_P;
writel(fp_pm, par->vid_regs + GX_FP_PM);
diff --git a/drivers/video/geode/video_gx.h b/drivers/video/geode/video_gx.h
index 2d9211f..238181a 100644
--- a/drivers/video/geode/video_gx.h
+++ b/drivers/video/geode/video_gx.h
@@ -28,6 +28,13 @@ # define GX_DCFG_VG_CK 0x00100000
# define GX_DCFG_GV_GAM 0x00200000
# define GX_DCFG_DAC_VREF 0x04000000
+/* Geode GX MISC video configuration */
+
+#define GX_MISC 0x50
+#define GX_MISC_GAM_EN 0x00000001
+#define GX_MISC_DAC_PWRDN 0x00000400
+#define GX_MISC_A_PWRDN 0x00000800
+
/* Geode GX flat panel display control registers */
#define GX_FP_PM 0x410
# define GX_FP_PM_P 0x01000000
-
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