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@xxxxxxxxxxxxxxxxxxx>
---
drivers/gpu/drm/ast/ast_drv.h | 3 +++
drivers/gpu/drm/ast/ast_main.c | 47 ++++++++++++++++++++++++++++++++++++++++--
drivers/gpu/drm/ast/ast_post.c | 23 +++++++++++++--------
3 files changed, 62 insertions(+), 11 deletions(-)
diff --git a/drivers/gpu/drm/ast/ast_drv.h b/drivers/gpu/drm/ast/ast_drv.h
index a203a6f..78fc683 100644
--- a/drivers/gpu/drm/ast/ast_drv.h
+++ b/drivers/gpu/drm/ast/ast_drv.h
@@ -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);
diff --git a/drivers/gpu/drm/ast/ast_main.c b/drivers/gpu/drm/ast/ast_main.c
index c2ff793..556d065 100644
--- a/drivers/gpu/drm/ast/ast_main.c
+++ b/drivers/gpu/drm/ast/ast_main.c
@@ -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;
diff --git a/drivers/gpu/drm/ast/ast_post.c b/drivers/gpu/drm/ast/ast_post.c
index 38d437f..810c51d 100644
--- a/drivers/gpu/drm/ast/ast_post.c
+++ b/drivers/gpu/drm/ast/ast_post.c
@@ -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, AST_IO_VGA_ENABLE_PORT, 0x01);
+ ast_io_write8(ast, AST_IO_MISC_PORT_WRITE, 0x01);
+}
+
+void ast_enable_mmio(struct drm_device *dev)
{
struct ast_private *ast = dev->dev_private;
- ast_io_write8(ast, 0x43, 0x01);
- ast_io_write8(ast, 0x42, 0x01);
+ ast_set_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xa1, 0xff, 0x04);
}
-#if 0 /* will use later */
-static bool
-ast_is_vga_enabled(struct drm_device *dev)
+
+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);
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