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drm/ast: POST chip at probe time if VGA not enabled

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We need to do it on machines without a BIOS such as POWER8. Also
for detection to work without triggering PCIe errors, we need
to enable VGA early on, inside ast_detect_chip().

While touching those files, replace a few hard coded register
numbers with the corresponding symbolic constant.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Dave Airlie <airlied@redhat.com>
This commit is contained in:
Benjamin Herrenschmidt 2014-09-04 17:50:11 +10:00 committed by Dave Airlie
parent 0dd68309b9
commit d1b985572a
3 changed files with 62 additions and 11 deletions
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3
drivers/gpu/drm/ast/ast_drv.h
View File

@ -384,6 +384,9 @@ int ast_bo_push_sysram(struct ast_bo *bo);
int ast_mmap(struct file *filp, struct vm_area_struct *vma);
/* ast post */
void ast_enable_vga(struct drm_device *dev);
void ast_enable_mmio(struct drm_device *dev);
bool ast_is_vga_enabled(struct drm_device *dev);
void ast_post_gpu(struct drm_device *dev);
u32 ast_mindwm(struct ast_private *ast, u32 r);
void ast_moutdwm(struct ast_private *ast, u32 r, u32 v);

47
drivers/gpu/drm/ast/ast_main.c
View File

@ -63,7 +63,7 @@ uint8_t ast_get_index_reg_mask(struct ast_private *ast,
}
static int ast_detect_chip(struct drm_device *dev)
static int ast_detect_chip(struct drm_device *dev, bool *need_post)
{
struct ast_private *ast = dev->dev_private;
uint32_t data, jreg;
@ -109,6 +109,21 @@ static int ast_detect_chip(struct drm_device *dev)
}
}
/*
* If VGA isn't enabled, we need to enable now or subsequent
* access to the scratch registers will fail. We also inform
* our caller that it needs to POST the chip
* (Assumption: VGA not enabled -> need to POST)
*/
if (!ast_is_vga_enabled(dev)) {
ast_enable_vga(dev);
ast_enable_mmio(dev);
DRM_INFO("VGA not enabled on entry, requesting chip POST\n");
*need_post = true;
} else
*need_post = false;
/* Check if we support wide screen */
switch (ast->chip) {
case AST1180:
ast->support_wide_screen = true;
@ -124,6 +139,7 @@ static int ast_detect_chip(struct drm_device *dev)
ast->support_wide_screen = true;
else {
ast->support_wide_screen = false;
/* Read SCU7c (silicon revision register) */
ast_write32(ast, 0xf004, 0x1e6e0000);
ast_write32(ast, 0xf000, 0x1);
data = ast_read32(ast, 0x1207c);
@ -136,11 +152,23 @@ static int ast_detect_chip(struct drm_device *dev)
break;
}
/* Check 3rd Tx option (digital output afaik) */
ast->tx_chip_type = AST_TX_NONE;
/*
* VGACRA3 Enhanced Color Mode Register, check if DVO is already
* enabled, in that case, assume we have a SIL164 TMDS transmitter
*/
jreg = ast_get_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xa3, 0xff);
if (jreg & 0x80)
ast->tx_chip_type = AST_TX_SIL164;
if ((ast->chip == AST2300) || (ast->chip == AST2400)) {
/*
* On AST2300 and 2400, look the configuration set by the SoC in
* the SOC scratch register #1 bits 11:8 (interestingly marked
* as "reserved" in the spec
*/
jreg = ast_get_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xd1, 0xff);
switch (jreg) {
case 0x04:
@ -161,6 +189,17 @@ static int ast_detect_chip(struct drm_device *dev)
}
}
/* Print stuff for diagnostic purposes */
switch(ast->tx_chip_type) {
case AST_TX_SIL164:
DRM_INFO("Using Sil164 TMDS transmitter\n");
break;
case AST_TX_DP501:
DRM_INFO("Using DP501 DisplayPort transmitter\n");
break;
default:
DRM_INFO("Analog VGA only\n");
}
return 0;
}
@ -345,6 +384,7 @@ static u32 ast_get_vram_info(struct drm_device *dev)
int ast_driver_load(struct drm_device *dev, unsigned long flags)
{
struct ast_private *ast;
bool need_post;
int ret = 0;
ast = kzalloc(sizeof(struct ast_private), GFP_KERNEL);
@ -379,7 +419,7 @@ int ast_driver_load(struct drm_device *dev, unsigned long flags)
}
}
ast_detect_chip(dev);
ast_detect_chip(dev, &need_post);
if (ast->chip != AST1180) {
ast_get_dram_info(dev);
@ -387,6 +427,9 @@ int ast_driver_load(struct drm_device *dev, unsigned long flags)
DRM_INFO("dram %d %d %d %08x\n", ast->mclk, ast->dram_type, ast->dram_bus_width, ast->vram_size);
}
if (need_post)
ast_post_gpu(dev);
ret = ast_mm_init(ast);
if (ret)
goto out_free;

23
drivers/gpu/drm/ast/ast_post.c
View File

@ -33,18 +33,23 @@
static void ast_init_dram_2300(struct drm_device *dev);
static void
ast_enable_vga(struct drm_device *dev)
void ast_enable_vga(struct drm_device *dev)
{
struct ast_private *ast = dev->dev_private;
ast_io_write8(ast, 0x43, 0x01);
ast_io_write8(ast, 0x42, 0x01);
ast_io_write8(ast, AST_IO_VGA_ENABLE_PORT, 0x01);
ast_io_write8(ast, AST_IO_MISC_PORT_WRITE, 0x01);
}
#if 0 /* will use later */
static bool
ast_is_vga_enabled(struct drm_device *dev)
void ast_enable_mmio(struct drm_device *dev)
{
struct ast_private *ast = dev->dev_private;
ast_set_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xa1, 0xff, 0x04);
}
bool ast_is_vga_enabled(struct drm_device *dev)
{
struct ast_private *ast = dev->dev_private;
u8 ch;
@ -52,7 +57,7 @@ ast_is_vga_enabled(struct drm_device *dev)
if (ast->chip == AST1180) {
/* TODO 1180 */
} else {
ch = ast_io_read8(ast, 0x43);
ch = ast_io_read8(ast, AST_IO_VGA_ENABLE_PORT);
if (ch) {
ast_open_key(ast);
ch = ast_get_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xb6, 0xff);
@ -61,7 +66,6 @@ ast_is_vga_enabled(struct drm_device *dev)
}
return 0;
}
#endif
static const u8 extreginfo[] = { 0x0f, 0x04, 0x1c, 0xff };
static const u8 extreginfo_ast2300a0[] = { 0x0f, 0x04, 0x1c, 0xff };
@ -371,6 +375,7 @@ void ast_post_gpu(struct drm_device *dev)
pci_write_config_dword(ast->dev->pdev, 0x04, reg);
ast_enable_vga(dev);
ast_enable_mmio(dev);
ast_open_key(ast);
ast_set_def_ext_reg(dev);