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x86/gpu: Implement stolen memory size early quirk for CHV

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CHV uses the same bits as SNB/VLV to code the Graphics Mode Select field
(GFX stolen memory size) with the addition of finer granularity modes:
4MB increments from 0x11 (8MB) to 0x1d.

Values strictly above 0x1d are either reserved or not supported.

v2: 4MB increments, not 8MB. 32MB has been omitted from the list of new
    values (Ville Syrjälä)

v3: Also correctly interpret GGMS (GTT Graphics Memory Size) (Ville
    Syrjälä)

v4: Don't assign a value that needs 20bits or more to a u16 (Rafael
    Barbalho)

[vsyrjala: v5: Split from i915 changes and add chv_stolen_funcs]

Cc: Ingo Molnar <mingo@kernel.org>
Cc: H. Peter Anvin <hpa@zytor.com>
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Rafael Barbalho <rafael.barbalho@intel.com>
Tested-by: Rafael Barbalho <rafael.barbalho@intel.com>
Signed-off-by: Damien Lespiau <damien.lespiau@intel.com>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Damien Lespiau 2014-05-08 22:19:41 +03:00 committed by Daniel Vetter
parent d7f25f23d2
commit 3e3b2c3908
1 changed files with 27 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

28
arch/x86/kernel/early-quirks.c
View File

@ -428,6 +428,26 @@ static size_t gen8_stolen_size(int num, int slot, int func)
return gmch_ctrl << 25; /* 32 MB units */
}
static size_t __init chv_stolen_size(int num, int slot, int func)
{
u16 gmch_ctrl;
gmch_ctrl = read_pci_config_16(num, slot, func, SNB_GMCH_CTRL);
gmch_ctrl >>= SNB_GMCH_GMS_SHIFT;
gmch_ctrl &= SNB_GMCH_GMS_MASK;
/*
* 0x0 to 0x10: 32MB increments starting at 0MB
* 0x11 to 0x16: 4MB increments starting at 8MB
* 0x17 to 0x1d: 4MB increments start at 36MB
*/
if (gmch_ctrl < 0x11)
return gmch_ctrl << 25;
else if (gmch_ctrl < 0x17)
return (gmch_ctrl - 0x11 + 2) << 22;
else
return (gmch_ctrl - 0x17 + 9) << 22;
}
struct intel_stolen_funcs {
size_t (*size)(int num, int slot, int func);
@ -469,6 +489,11 @@ static const struct intel_stolen_funcs gen8_stolen_funcs = {
.size = gen8_stolen_size,
};
static const struct intel_stolen_funcs chv_stolen_funcs = {
.base = intel_stolen_base,
.size = chv_stolen_size,
};
static struct pci_device_id intel_stolen_ids[] __initdata = {
INTEL_I830_IDS(&i830_stolen_funcs),
INTEL_I845G_IDS(&i845_stolen_funcs),
@ -495,7 +520,8 @@ static struct pci_device_id intel_stolen_ids[] __initdata = {
INTEL_HSW_D_IDS(&gen6_stolen_funcs),
INTEL_HSW_M_IDS(&gen6_stolen_funcs),
INTEL_BDW_M_IDS(&gen8_stolen_funcs),
INTEL_BDW_D_IDS(&gen8_stolen_funcs)
INTEL_BDW_D_IDS(&gen8_stolen_funcs),
INTEL_CHV_IDS(&chv_stolen_funcs),
};
static void __init intel_graphics_stolen(int num, int slot, int func)