Fix resume from suspend on IBM X30
This patch fixes the resume from suspend-to-ram on the IBM X30 laptop. The problem is caused by the Bios missing to re-initialize the iVCH registers, especially the PLL registers. This patch records the iVCH registers during initialization, and re-installs this register set when resuming. Signed-off-by: Thomas Richter <thor@math.tu-berlin.de> Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Родитель
8a1ebd7480
Коммит
ac3f918d5a
|
@ -22,6 +22,7 @@
|
|||
*
|
||||
* Authors:
|
||||
* Eric Anholt <eric@anholt.net>
|
||||
* Thomas Richter <thor@math.tu-berlin.de>
|
||||
*
|
||||
* Minor modifications (Dithering enable):
|
||||
* Thomas Richter <thor@math.tu-berlin.de>
|
||||
|
@ -90,7 +91,7 @@
|
|||
/*
|
||||
* LCD Vertical Display Size
|
||||
*/
|
||||
#define VR21 0x20
|
||||
#define VR21 0x21
|
||||
|
||||
/*
|
||||
* Panel power down status
|
||||
|
@ -155,16 +156,33 @@
|
|||
# define VR8F_POWER_MASK (0x3c)
|
||||
# define VR8F_POWER_POS (2)
|
||||
|
||||
/* Some Bios implementations do not restore the DVO state upon
|
||||
* resume from standby. Thus, this driver has to handle it
|
||||
* instead. The following list contains all registers that
|
||||
* require saving.
|
||||
*/
|
||||
static const uint16_t backup_addresses[] = {
|
||||
0x11, 0x12,
|
||||
0x18, 0x19, 0x1a, 0x1f,
|
||||
0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27,
|
||||
0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37,
|
||||
0x8e, 0x8f,
|
||||
0x10 /* this must come last */
|
||||
};
|
||||
|
||||
|
||||
struct ivch_priv {
|
||||
bool quiet;
|
||||
|
||||
uint16_t width, height;
|
||||
|
||||
/* Register backup */
|
||||
|
||||
uint16_t reg_backup[ARRAY_SIZE(backup_addresses)];
|
||||
};
|
||||
|
||||
|
||||
static void ivch_dump_regs(struct intel_dvo_device *dvo);
|
||||
|
||||
/**
|
||||
* Reads a register on the ivch.
|
||||
*
|
||||
|
@ -246,6 +264,7 @@ static bool ivch_init(struct intel_dvo_device *dvo,
|
|||
{
|
||||
struct ivch_priv *priv;
|
||||
uint16_t temp;
|
||||
int i;
|
||||
|
||||
priv = kzalloc(sizeof(struct ivch_priv), GFP_KERNEL);
|
||||
if (priv == NULL)
|
||||
|
@ -273,6 +292,14 @@ static bool ivch_init(struct intel_dvo_device *dvo,
|
|||
ivch_read(dvo, VR20, &priv->width);
|
||||
ivch_read(dvo, VR21, &priv->height);
|
||||
|
||||
/* Make a backup of the registers to be able to restore them
|
||||
* upon suspend.
|
||||
*/
|
||||
for (i = 0; i < ARRAY_SIZE(backup_addresses); i++)
|
||||
ivch_read(dvo, backup_addresses[i], priv->reg_backup + i);
|
||||
|
||||
ivch_dump_regs(dvo);
|
||||
|
||||
return true;
|
||||
|
||||
out:
|
||||
|
@ -294,12 +321,31 @@ static enum drm_mode_status ivch_mode_valid(struct intel_dvo_device *dvo,
|
|||
return MODE_OK;
|
||||
}
|
||||
|
||||
/* Restore the DVO registers after a resume
|
||||
* from RAM. Registers have been saved during
|
||||
* the initialization.
|
||||
*/
|
||||
static void ivch_reset(struct intel_dvo_device *dvo)
|
||||
{
|
||||
struct ivch_priv *priv = dvo->dev_priv;
|
||||
int i;
|
||||
|
||||
DRM_DEBUG_KMS("Resetting the IVCH registers\n");
|
||||
|
||||
ivch_write(dvo, VR10, 0x0000);
|
||||
|
||||
for (i = 0; i < ARRAY_SIZE(backup_addresses); i++)
|
||||
ivch_write(dvo, backup_addresses[i], priv->reg_backup[i]);
|
||||
}
|
||||
|
||||
/** Sets the power state of the panel connected to the ivch */
|
||||
static void ivch_dpms(struct intel_dvo_device *dvo, bool enable)
|
||||
{
|
||||
int i;
|
||||
uint16_t vr01, vr30, backlight;
|
||||
|
||||
ivch_reset(dvo);
|
||||
|
||||
/* Set the new power state of the panel. */
|
||||
if (!ivch_read(dvo, VR01, &vr01))
|
||||
return;
|
||||
|
@ -308,6 +354,7 @@ static void ivch_dpms(struct intel_dvo_device *dvo, bool enable)
|
|||
backlight = 1;
|
||||
else
|
||||
backlight = 0;
|
||||
|
||||
ivch_write(dvo, VR80, backlight);
|
||||
|
||||
if (enable)
|
||||
|
@ -334,6 +381,8 @@ static bool ivch_get_hw_state(struct intel_dvo_device *dvo)
|
|||
{
|
||||
uint16_t vr01;
|
||||
|
||||
ivch_reset(dvo);
|
||||
|
||||
/* Set the new power state of the panel. */
|
||||
if (!ivch_read(dvo, VR01, &vr01))
|
||||
return false;
|
||||
|
@ -348,11 +397,15 @@ static void ivch_mode_set(struct intel_dvo_device *dvo,
|
|||
struct drm_display_mode *mode,
|
||||
struct drm_display_mode *adjusted_mode)
|
||||
{
|
||||
struct ivch_priv *priv = dvo->dev_priv;
|
||||
uint16_t vr40 = 0;
|
||||
uint16_t vr01 = 0;
|
||||
uint16_t vr10;
|
||||
|
||||
ivch_read(dvo, VR10, &vr10);
|
||||
ivch_reset(dvo);
|
||||
|
||||
vr10 = priv->reg_backup[ARRAY_SIZE(backup_addresses) - 1];
|
||||
|
||||
/* Enable dithering for 18 bpp pipelines */
|
||||
vr10 &= VR10_INTERFACE_DEPTH_MASK;
|
||||
if (vr10 == VR10_INTERFACE_2X18 || vr10 == VR10_INTERFACE_1X18)
|
||||
|
@ -366,7 +419,7 @@ static void ivch_mode_set(struct intel_dvo_device *dvo,
|
|||
uint16_t x_ratio, y_ratio;
|
||||
|
||||
vr01 |= VR01_PANEL_FIT_ENABLE;
|
||||
vr40 |= VR40_CLOCK_GATING_ENABLE | VR40_ENHANCED_PANEL_FITTING;
|
||||
vr40 |= VR40_CLOCK_GATING_ENABLE;
|
||||
x_ratio = (((mode->hdisplay - 1) << 16) /
|
||||
(adjusted_mode->hdisplay - 1)) >> 2;
|
||||
y_ratio = (((mode->vdisplay - 1) << 16) /
|
||||
|
@ -381,8 +434,6 @@ static void ivch_mode_set(struct intel_dvo_device *dvo,
|
|||
|
||||
ivch_write(dvo, VR01, vr01);
|
||||
ivch_write(dvo, VR40, vr40);
|
||||
|
||||
ivch_dump_regs(dvo);
|
||||
}
|
||||
|
||||
static void ivch_dump_regs(struct intel_dvo_device *dvo)
|
||||
|
|
Загрузка…
Ссылка в новой задаче