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lxfb: add power management functionality

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This adds the ability to suspend/resume the lxfb driver, which includes:
  - Register and palette saving code; registers are stored in lxfb_par.
    A few MSR values are saved as well.
  - lx_powerup and lx_powerdown functions which restore/save registers and
    enable/disable graphic engines.
  - lxfb_suspend/lxfb_resume

Originally based on a patch by Jordan Crouse.

[akpm@linux-foundation.org: be conventional, save an ifdef]
Signed-off-by: Andres Salomon <dilinger@debian.org>
Cc: "Antonino A. Daplas" <adaplas@pol.net>
Cc: Jordan Crouse <jordan.crouse@amd.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Andres Salomon
2008-04-28 02:15:27 -07:00
committed by Linus Torvalds
parent aec40532c4
commit f694e53bd0
3 changed files with 340 additions and 9 deletions
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45
drivers/video/geode/lxfb.h
View File

@@ -3,6 +3,16 @@
#include <linux/fb.h>
#define GP_REG_COUNT (0x7c / 4)
#define DC_REG_COUNT (0xf0 / 4)
#define VP_REG_COUNT (0x158 / 8)
#define FP_REG_COUNT (0x60 / 8)
#define DC_PAL_COUNT 0x104
#define DC_HFILT_COUNT 0x100
#define DC_VFILT_COUNT 0x100
#define VP_COEFF_SIZE 0x1000
#define OUTPUT_CRT 0x01
#define OUTPUT_PANEL 0x02
@@ -12,6 +22,27 @@ struct lxfb_par {
void __iomem *gp_regs;
void __iomem *dc_regs;
void __iomem *vp_regs;
#ifdef CONFIG_PM
int powered_down;
/* register state, for power mgmt functionality */
struct {
uint64_t padsel;
uint64_t dotpll;
uint64_t dfglcfg;
uint64_t dcspare;
} msr;
uint32_t gp[GP_REG_COUNT];
uint32_t dc[DC_REG_COUNT];
uint64_t vp[VP_REG_COUNT];
uint64_t fp[FP_REG_COUNT];
uint32_t pal[DC_PAL_COUNT];
uint32_t hcoeff[DC_HFILT_COUNT * 2];
uint32_t vcoeff[DC_VFILT_COUNT];
uint32_t vp_coeff[VP_COEFF_SIZE / 4];
#endif
};
static inline unsigned int lx_get_pitch(unsigned int xres, int bpp)
@@ -27,6 +58,11 @@ int lx_blank_display(struct fb_info *, int);
void lx_set_palette_reg(struct fb_info *, unsigned int, unsigned int,
unsigned int, unsigned int);
#ifdef CONFIG_PM
int lx_powerdown(struct fb_info *info);
int lx_powerup(struct fb_info *info);
#endif
/* Graphics Processor registers (table 6-29 from the data book) */
enum gp_registers {
@@ -182,6 +218,9 @@ enum dc_registers {
#define DC_DV_CTL_DV_LINE_SIZE_2K (1 << 10)
#define DC_DV_CTL_DV_LINE_SIZE_4K (1 << 11)
#define DC_DV_CTL_DV_LINE_SIZE_8K ((1 << 10) | (1 << 11))
#define DC_DV_CTL_CLEAR_DV_RAM (1 << 0)
#define DC_IRQ_FILT_CTL_H_FILT_SEL (1 << 10)
#define DC_CLR_KEY_CLR_KEY_EN (1 << 24)
@@ -267,6 +306,8 @@ enum vp_registers {
VP_A2YE,
VP_A3YE, /* 0x150 */
VP_VCR = 0x1000, /* 0x1000 - 0x1fff */
};
#define VP_VCFG_VID_EN (1 << 0)
@@ -319,6 +360,10 @@ enum fp_registers {
#define FP_PT2_SCRC (1 << 27) /* shfclk free */
#define FP_PM_P (1 << 24) /* panel power ctl */
#define FP_PM_PANEL_PWR_UP (1 << 3) /* r/o */
#define FP_PM_PANEL_PWR_DOWN (1 << 2) /* r/o */
#define FP_PM_PANEL_OFF (1 << 1) /* r/o */
#define FP_PM_PANEL_ON (1 << 0) /* r/o */
#define FP_DFC_BC ((1 << 4) | (1 << 5) | (1 << 6))