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authorAndres Salomon <dilinger@queued.net>2008-04-28 02:15:27 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2008-04-28 08:58:39 -0700
commitf694e53bd0db69557ee8e0db2d1602818ff173b0 (patch)
treed904b492105055a2adf00c60fa0324c0905b3bbe /drivers/video/geode/lxfb_ops.c
parentaec40532c4d1183fa1ec415bb7dae08e19fc6b01 (diff)
lxfb: add power management functionality
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>
Diffstat (limited to 'drivers/video/geode/lxfb_ops.c')
-rw-r--r--drivers/video/geode/lxfb_ops.c263
1 files changed, 254 insertions, 9 deletions
diff --git a/drivers/video/geode/lxfb_ops.c b/drivers/video/geode/lxfb_ops.c
index a68def88c92..7abc439101c 100644
--- a/drivers/video/geode/lxfb_ops.c
+++ b/drivers/video/geode/lxfb_ops.c
@@ -232,8 +232,8 @@ static void lx_graphics_disable(struct fb_info *info)
val = read_dc(par, DC_CLR_KEY);
write_dc(par, DC_CLR_KEY, val & ~DC_CLR_KEY_CLR_KEY_EN);
- /* We don't actually blank the panel, due to the long latency
- involved with bringing it back */
+ /* turn off the panel */
+ write_fp(par, FP_PM, read_fp(par, FP_PM) & ~FP_PM_P);
val = read_vp(par, VP_MISC) | VP_MISC_DACPWRDN;
write_vp(par, VP_MISC, val);
@@ -321,13 +321,8 @@ static void lx_graphics_enable(struct fb_info *info)
}
/* Turn the panel on (if it isn't already) */
-
- if (par->output & OUTPUT_PANEL) {
- temp = read_fp(par, FP_PM);
-
- if (!(temp & 0x09))
- write_fp(par, FP_PM, temp | FP_PM_P);
- }
+ if (par->output & OUTPUT_PANEL)
+ write_fp(par, FP_PM, read_fp(par, FP_PM) | FP_PM_P);
}
unsigned int lx_framebuffer_size(void)
@@ -575,3 +570,253 @@ int lx_blank_display(struct fb_info *info, int blank_mode)
return 0;
}
+
+#ifdef CONFIG_PM
+
+static void lx_save_regs(struct lxfb_par *par)
+{
+ uint32_t filt;
+ int i;
+
+ /* wait for the BLT engine to stop being busy */
+ do {
+ i = read_gp(par, GP_BLT_STATUS);
+ } while ((i & GP_BLT_STATUS_PB) || !(i & GP_BLT_STATUS_CE));
+
+ /* save MSRs */
+ rdmsrl(MSR_LX_MSR_PADSEL, par->msr.padsel);
+ rdmsrl(MSR_GLCP_DOTPLL, par->msr.dotpll);
+ rdmsrl(MSR_LX_GLD_MSR_CONFIG, par->msr.dfglcfg);
+ rdmsrl(MSR_LX_SPARE_MSR, par->msr.dcspare);
+
+ write_dc(par, DC_UNLOCK, DC_UNLOCK_UNLOCK);
+
+ /* save registers */
+ memcpy(par->gp, par->gp_regs, sizeof(par->gp));
+ memcpy(par->dc, par->dc_regs, sizeof(par->dc));
+ memcpy(par->vp, par->vp_regs, sizeof(par->vp));
+ memcpy(par->fp, par->vp_regs + VP_FP_START, sizeof(par->fp));
+
+ /* save the palette */
+ write_dc(par, DC_PAL_ADDRESS, 0);
+ for (i = 0; i < ARRAY_SIZE(par->pal); i++)
+ par->pal[i] = read_dc(par, DC_PAL_DATA);
+
+ /* save the horizontal filter coefficients */
+ filt = par->dc[DC_IRQ_FILT_CTL] | DC_IRQ_FILT_CTL_H_FILT_SEL;
+ for (i = 0; i < ARRAY_SIZE(par->hcoeff); i += 2) {
+ write_dc(par, DC_IRQ_FILT_CTL, (filt & 0xffffff00) | i);
+ par->hcoeff[i] = read_dc(par, DC_FILT_COEFF1);
+ par->hcoeff[i + 1] = read_dc(par, DC_FILT_COEFF2);
+ }
+
+ /* save the vertical filter coefficients */
+ filt &= ~DC_IRQ_FILT_CTL_H_FILT_SEL;
+ for (i = 0; i < ARRAY_SIZE(par->vcoeff); i++) {
+ write_dc(par, DC_IRQ_FILT_CTL, (filt & 0xffffff00) | i);
+ par->vcoeff[i] = read_dc(par, DC_FILT_COEFF1);
+ }
+
+ /* save video coeff ram */
+ memcpy(par->vp_coeff, par->vp_regs + VP_VCR, sizeof(par->vp_coeff));
+}
+
+static void lx_restore_gfx_proc(struct lxfb_par *par)
+{
+ int i;
+
+ /* a bunch of registers require GP_RASTER_MODE to be set first */
+ write_gp(par, GP_RASTER_MODE, par->gp[GP_RASTER_MODE]);
+
+ for (i = 0; i < ARRAY_SIZE(par->gp); i++) {
+ switch (i) {
+ case GP_RASTER_MODE:
+ case GP_VECTOR_MODE:
+ case GP_BLT_MODE:
+ case GP_BLT_STATUS:
+ case GP_HST_SRC:
+ /* FIXME: restore LUT data */
+ case GP_LUT_INDEX:
+ case GP_LUT_DATA:
+ /* don't restore these registers */
+ break;
+
+ default:
+ write_gp(par, i, par->gp[i]);
+ }
+ }
+}
+
+static void lx_restore_display_ctlr(struct lxfb_par *par)
+{
+ uint32_t filt;
+ int i;
+
+ wrmsrl(MSR_LX_SPARE_MSR, par->msr.dcspare);
+
+ for (i = 0; i < ARRAY_SIZE(par->dc); i++) {
+ switch (i) {
+ case DC_UNLOCK:
+ /* unlock the DC; runs first */
+ write_dc(par, DC_UNLOCK, DC_UNLOCK_UNLOCK);
+ break;
+
+ case DC_GENERAL_CFG:
+ case DC_DISPLAY_CFG:
+ /* disable all while restoring */
+ write_dc(par, i, 0);
+ break;
+
+ case DC_DV_CTL:
+ /* set all ram to dirty */
+ write_dc(par, i, par->dc[i] | DC_DV_CTL_CLEAR_DV_RAM);
+
+ case DC_RSVD_1:
+ case DC_RSVD_2:
+ case DC_RSVD_3:
+ case DC_LINE_CNT:
+ case DC_PAL_ADDRESS:
+ case DC_PAL_DATA:
+ case DC_DFIFO_DIAG:
+ case DC_CFIFO_DIAG:
+ case DC_FILT_COEFF1:
+ case DC_FILT_COEFF2:
+ case DC_RSVD_4:
+ case DC_RSVD_5:
+ /* don't restore these registers */
+ break;
+
+ default:
+ write_dc(par, i, par->dc[i]);
+ }
+ }
+
+ /* restore the palette */
+ write_dc(par, DC_PAL_ADDRESS, 0);
+ for (i = 0; i < ARRAY_SIZE(par->pal); i++)
+ write_dc(par, DC_PAL_DATA, par->pal[i]);
+
+ /* restore the horizontal filter coefficients */
+ filt = par->dc[DC_IRQ_FILT_CTL] | DC_IRQ_FILT_CTL_H_FILT_SEL;
+ for (i = 0; i < ARRAY_SIZE(par->hcoeff); i += 2) {
+ write_dc(par, DC_IRQ_FILT_CTL, (filt & 0xffffff00) | i);
+ write_dc(par, DC_FILT_COEFF1, par->hcoeff[i]);
+ write_dc(par, DC_FILT_COEFF2, par->hcoeff[i + 1]);
+ }
+
+ /* restore the vertical filter coefficients */
+ filt &= ~DC_IRQ_FILT_CTL_H_FILT_SEL;
+ for (i = 0; i < ARRAY_SIZE(par->vcoeff); i++) {
+ write_dc(par, DC_IRQ_FILT_CTL, (filt & 0xffffff00) | i);
+ write_dc(par, DC_FILT_COEFF1, par->vcoeff[i]);
+ }
+}
+
+static void lx_restore_video_proc(struct lxfb_par *par)
+{
+ int i;
+
+ wrmsrl(MSR_LX_GLD_MSR_CONFIG, par->msr.dfglcfg);
+ wrmsrl(MSR_LX_MSR_PADSEL, par->msr.padsel);
+
+ for (i = 0; i < ARRAY_SIZE(par->vp); i++) {
+ switch (i) {
+ case VP_VCFG:
+ case VP_DCFG:
+ case VP_PAR:
+ case VP_PDR:
+ case VP_CCS:
+ case VP_RSVD_0:
+ /* case VP_VDC: */ /* why should this not be restored? */
+ case VP_RSVD_1:
+ case VP_CRC32:
+ /* don't restore these registers */
+ break;
+
+ default:
+ write_vp(par, i, par->vp[i]);
+ }
+ }
+
+ /* restore video coeff ram */
+ memcpy(par->vp_regs + VP_VCR, par->vp_coeff, sizeof(par->vp_coeff));
+}
+
+static void lx_restore_regs(struct lxfb_par *par)
+{
+ int i;
+
+ lx_set_dotpll((u32) (par->msr.dotpll >> 32));
+ lx_restore_gfx_proc(par);
+ lx_restore_display_ctlr(par);
+ lx_restore_video_proc(par);
+
+ /* Flat Panel */
+ for (i = 0; i < ARRAY_SIZE(par->fp); i++) {
+ switch (i) {
+ case FP_PM:
+ case FP_RSVD_0:
+ case FP_RSVD_1:
+ case FP_RSVD_2:
+ case FP_RSVD_3:
+ case FP_RSVD_4:
+ /* don't restore these registers */
+ break;
+
+ default:
+ write_fp(par, i, par->fp[i]);
+ }
+ }
+
+ /* control the panel */
+ if (par->fp[FP_PM] & FP_PM_P) {
+ /* power on the panel if not already power{ed,ing} on */
+ if (!(read_fp(par, FP_PM) &
+ (FP_PM_PANEL_ON|FP_PM_PANEL_PWR_UP)))
+ write_fp(par, FP_PM, par->fp[FP_PM]);
+ } else {
+ /* power down the panel if not already power{ed,ing} down */
+ if (!(read_fp(par, FP_PM) &
+ (FP_PM_PANEL_OFF|FP_PM_PANEL_PWR_DOWN)))
+ write_fp(par, FP_PM, par->fp[FP_PM]);
+ }
+
+ /* turn everything on */
+ write_vp(par, VP_VCFG, par->vp[VP_VCFG]);
+ write_vp(par, VP_DCFG, par->vp[VP_DCFG]);
+ write_dc(par, DC_DISPLAY_CFG, par->dc[DC_DISPLAY_CFG]);
+ /* do this last; it will enable the FIFO load */
+ write_dc(par, DC_GENERAL_CFG, par->dc[DC_GENERAL_CFG]);
+
+ /* lock the door behind us */
+ write_dc(par, DC_UNLOCK, DC_UNLOCK_LOCK);
+}
+
+int lx_powerdown(struct fb_info *info)
+{
+ struct lxfb_par *par = info->par;
+
+ if (par->powered_down)
+ return 0;
+
+ lx_save_regs(par);
+ lx_graphics_disable(info);
+
+ par->powered_down = 1;
+ return 0;
+}
+
+int lx_powerup(struct fb_info *info)
+{
+ struct lxfb_par *par = info->par;
+
+ if (!par->powered_down)
+ return 0;
+
+ lx_restore_regs(par);
+
+ par->powered_down = 0;
+ return 0;
+}
+
+#endif