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Kernel/IntelGraphics: Move PLL handling code to a different file

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Dealing with the specific details of how to program a PLL should be done
in a separate file to ensure we can easily expand it to support future
generations of the Intel graphics device.
This commit is contained in:
Liav A 2023-02-03 11:40:42 +02:00 committed by Andrew Kaster
parent 9eab59c42b
commit ac4829cc50
Notes: sideshowbarker 2024-07-17 17:40:13 +09:00 
Author: https://github.com/supercomputer7
Commit: https://github.com/SerenityOS/serenity/commit/ac4829cc50
Pull-request: https://github.com/SerenityOS/serenity/pull/17283
Reviewed-by: https://github.com/ADKaster ✅
5 changed files with 146 additions and 107 deletions
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1
Kernel/CMakeLists.txt
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@ -80,6 +80,7 @@ set(KERNEL_SOURCES
Graphics/Intel/Plane/G33DisplayPlane.cpp
Graphics/Intel/Transcoder/AnalogDisplayTranscoder.cpp
Graphics/Intel/Transcoder/DisplayTranscoder.cpp
Graphics/Intel/Transcoder/PLL.cpp
Graphics/Intel/DisplayConnectorGroup.cpp
Graphics/Intel/NativeDisplayConnector.cpp
Graphics/Intel/NativeGraphicsAdapter.cpp

107
Kernel/Graphics/Intel/DisplayConnectorGroup.cpp
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@ -13,115 +13,12 @@
#include <Kernel/Graphics/Intel/DisplayConnectorGroup.h>
#include <Kernel/Graphics/Intel/Plane/G33DisplayPlane.h>
#include <Kernel/Graphics/Intel/Transcoder/AnalogDisplayTranscoder.h>
#include <Kernel/Graphics/Intel/Transcoder/PLL.h>
#include <Kernel/Memory/Region.h>
#include <Kernel/Memory/TypedMapping.h>
namespace Kernel {
namespace IntelGraphics {
static constexpr PLLMaxSettings G35Limits {
{ 20'000'000, 400'000'000 }, // values in Hz, dot_clock
{ 1'400'000'000, 2'800'000'000 }, // values in Hz, VCO
{ 3, 8 }, // n
{ 70, 120 }, // m
{ 10, 20 }, // m1
{ 5, 9 }, // m2
{ 5, 80 }, // p
{ 1, 8 }, // p1
{ 5, 10 } // p2
};
}
static bool check_pll_settings(IntelGraphics::PLLSettings const& settings, size_t reference_clock, IntelGraphics::PLLMaxSettings const& limits)
{
if (settings.n < limits.n.min || settings.n > limits.n.max) {
dbgln_if(INTEL_GRAPHICS_DEBUG, "N is invalid {}", settings.n);
return false;
}
if (settings.m1 < limits.m1.min || settings.m1 > limits.m1.max) {
dbgln_if(INTEL_GRAPHICS_DEBUG, "m1 is invalid {}", settings.m1);
return false;
}
if (settings.m2 < limits.m2.min || settings.m2 > limits.m2.max) {
dbgln_if(INTEL_GRAPHICS_DEBUG, "m2 is invalid {}", settings.m2);
return false;
}
if (settings.p1 < limits.p1.min || settings.p1 > limits.p1.max) {
dbgln_if(INTEL_GRAPHICS_DEBUG, "p1 is invalid {}", settings.p1);
return false;
}
if (settings.m1 <= settings.m2) {
dbgln_if(INTEL_GRAPHICS_DEBUG, "m2 is invalid {} as it is bigger than m1 {}", settings.m2, settings.m1);
return false;
}
auto m = settings.compute_m();
auto p = settings.compute_p();
if (m < limits.m.min || m > limits.m.max) {
dbgln_if(INTEL_GRAPHICS_DEBUG, "m invalid {}", m);
return false;
}
if (p < limits.p.min || p > limits.p.max) {
dbgln_if(INTEL_GRAPHICS_DEBUG, "p invalid {}", p);
return false;
}
auto dot = settings.compute_dot_clock(reference_clock);
auto vco = settings.compute_vco(reference_clock);
if (dot < limits.dot_clock.min || dot > limits.dot_clock.max) {
dbgln_if(INTEL_GRAPHICS_DEBUG, "Dot clock invalid {}", dot);
return false;
}
if (vco < limits.vco.min || vco > limits.vco.max) {
dbgln_if(INTEL_GRAPHICS_DEBUG, "VCO clock invalid {}", vco);
return false;
}
return true;
}
static size_t find_absolute_difference(u64 target_frequency, u64 checked_frequency)
{
if (target_frequency >= checked_frequency)
return target_frequency - checked_frequency;
return checked_frequency - target_frequency;
}
Optional<IntelGraphics::PLLSettings> IntelDisplayConnectorGroup::create_pll_settings(u64 target_frequency, u64 reference_clock, IntelGraphics::PLLMaxSettings const& limits)
{
IntelGraphics::PLLSettings settings;
IntelGraphics::PLLSettings best_settings;
// FIXME: Is this correct for all Intel Native graphics cards?
settings.p2 = 10;
dbgln_if(INTEL_GRAPHICS_DEBUG, "Check PLL settings for ref clock of {} Hz, for target of {} Hz", reference_clock, target_frequency);
u64 best_difference = 0xffffffff;
for (settings.n = limits.n.min; settings.n <= limits.n.max; ++settings.n) {
for (settings.m1 = limits.m1.max; settings.m1 >= limits.m1.min; --settings.m1) {
for (settings.m2 = limits.m2.max; settings.m2 >= limits.m2.min; --settings.m2) {
for (settings.p1 = limits.p1.max; settings.p1 >= limits.p1.min; --settings.p1) {
dbgln_if(INTEL_GRAPHICS_DEBUG, "Check PLL settings for {} {} {} {} {}", settings.n, settings.m1, settings.m2, settings.p1, settings.p2);
if (!check_pll_settings(settings, reference_clock, limits))
continue;
auto current_dot_clock = settings.compute_dot_clock(reference_clock);
if (current_dot_clock == target_frequency)
return settings;
auto difference = find_absolute_difference(target_frequency, current_dot_clock);
if (difference < best_difference && (current_dot_clock > target_frequency)) {
best_settings = settings;
best_difference = difference;
}
}
}
}
}
if (best_settings.is_valid())
return best_settings;
return {};
}
ErrorOr<NonnullLockRefPtr<IntelDisplayConnectorGroup>> IntelDisplayConnectorGroup::try_create(Badge<IntelNativeGraphicsAdapter>, IntelGraphics::Generation generation, MMIORegion const& first_region, MMIORegion const& second_region)
{
auto registers_region = TRY(MM.allocate_kernel_region(first_region.pci_bar_paddr, first_region.pci_bar_space_length, "Intel Native Graphics Registers"sv, Memory::Region::Access::ReadWrite));
@ -323,7 +220,7 @@ bool IntelDisplayConnectorGroup::set_crt_resolution(DisplayConnector::ModeSettin
GraphicsManagement::the().disable_vga_emulation_access_permanently();
auto dac_multiplier = compute_dac_multiplier(mode_setting.pixel_clock_in_khz);
auto pll_settings = create_pll_settings((1000 * mode_setting.pixel_clock_in_khz * dac_multiplier), 96'000'000, IntelGraphics::G35Limits);
auto pll_settings = create_pll_settings(m_generation, (1000 * mode_setting.pixel_clock_in_khz * dac_multiplier), 96'000'000);
if (!pll_settings.has_value())
return false;
auto settings = pll_settings.value();

2
Kernel/Graphics/Intel/DisplayConnectorGroup.h
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@ -75,8 +75,6 @@ private:
void disable_dac_output();
void enable_dac_output();
Optional<IntelGraphics::PLLSettings> create_pll_settings(u64 target_frequency, u64 reference_clock, IntelGraphics::PLLMaxSettings const&);
Spinlock<LockRank::None> m_control_lock;
Spinlock<LockRank::None> m_modeset_lock;
mutable Spinlock<LockRank::None> m_registers_lock;

125
Kernel/Graphics/Intel/Transcoder/PLL.cpp Normal file
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@ -0,0 +1,125 @@
/*
* Copyright (c) 2023, Liav A. <liavalb@hotmail.co.il>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <AK/Format.h>
#include <Kernel/Debug.h>
#include <Kernel/Graphics/Intel/Transcoder/PLL.h>
namespace Kernel::IntelGraphics {
static constexpr PLLMaxSettings g35limits {
{ 20'000'000, 400'000'000 }, // values in Hz, dot_clock
{ 1'400'000'000, 2'800'000'000 }, // values in Hz, VCO
{ 3, 8 }, // n
{ 70, 120 }, // m
{ 10, 20 }, // m1
{ 5, 9 }, // m2
{ 5, 80 }, // p
{ 1, 8 }, // p1
{ 5, 10 } // p2
};
PLLMaxSettings const& pll_max_settings_for_generation(Generation generation)
{
switch (generation) {
case Generation::Gen4:
return g35limits;
default:
VERIFY_NOT_REACHED();
}
}
static size_t find_absolute_difference(u64 target_frequency, u64 checked_frequency)
{
if (target_frequency >= checked_frequency)
return target_frequency - checked_frequency;
return checked_frequency - target_frequency;
}
Optional<PLLSettings> create_pll_settings(Generation generation, u64 target_frequency, u64 reference_clock)
{
PLLSettings settings {};
PLLSettings best_settings {};
auto& limits = pll_max_settings_for_generation(generation);
// FIXME: Is this correct for all Intel Native graphics cards?
settings.p2 = 10;
dbgln_if(INTEL_GRAPHICS_DEBUG, "Check PLL settings for ref clock of {} Hz, for target of {} Hz", reference_clock, target_frequency);
u64 best_difference = 0xffffffff;
for (settings.n = limits.n.min; settings.n <= limits.n.max; ++settings.n) {
for (settings.m1 = limits.m1.max; settings.m1 >= limits.m1.min; --settings.m1) {
for (settings.m2 = limits.m2.max; settings.m2 >= limits.m2.min; --settings.m2) {
for (settings.p1 = limits.p1.max; settings.p1 >= limits.p1.min; --settings.p1) {
dbgln_if(INTEL_GRAPHICS_DEBUG, "Check PLL settings for {} {} {} {} {}", settings.n, settings.m1, settings.m2, settings.p1, settings.p2);
if (!check_pll_settings(settings, reference_clock, limits))
continue;
auto current_dot_clock = settings.compute_dot_clock(reference_clock);
if (current_dot_clock == target_frequency)
return settings;
auto difference = find_absolute_difference(target_frequency, current_dot_clock);
if (difference < best_difference && (current_dot_clock > target_frequency)) {
best_settings = settings;
best_difference = difference;
}
}
}
}
}
if (best_settings.is_valid())
return best_settings;
return {};
}
bool check_pll_settings(PLLSettings const& settings, size_t reference_clock, PLLMaxSettings const& limits)
{
if (settings.n < limits.n.min || settings.n > limits.n.max) {
dbgln_if(INTEL_GRAPHICS_DEBUG, "N is invalid {}", settings.n);
return false;
}
if (settings.m1 < limits.m1.min || settings.m1 > limits.m1.max) {
dbgln_if(INTEL_GRAPHICS_DEBUG, "m1 is invalid {}", settings.m1);
return false;
}
if (settings.m2 < limits.m2.min || settings.m2 > limits.m2.max) {
dbgln_if(INTEL_GRAPHICS_DEBUG, "m2 is invalid {}", settings.m2);
return false;
}
if (settings.p1 < limits.p1.min || settings.p1 > limits.p1.max) {
dbgln_if(INTEL_GRAPHICS_DEBUG, "p1 is invalid {}", settings.p1);
return false;
}
if (settings.m1 <= settings.m2) {
dbgln_if(INTEL_GRAPHICS_DEBUG, "m2 is invalid {} as it is bigger than m1 {}", settings.m2, settings.m1);
return false;
}
auto m = settings.compute_m();
auto p = settings.compute_p();
if (m < limits.m.min || m > limits.m.max) {
dbgln_if(INTEL_GRAPHICS_DEBUG, "m invalid {}", m);
return false;
}
if (p < limits.p.min || p > limits.p.max) {
dbgln_if(INTEL_GRAPHICS_DEBUG, "p invalid {}", p);
return false;
}
auto dot = settings.compute_dot_clock(reference_clock);
auto vco = settings.compute_vco(reference_clock);
if (dot < limits.dot_clock.min || dot > limits.dot_clock.max) {
dbgln_if(INTEL_GRAPHICS_DEBUG, "Dot clock invalid {}", dot);
return false;
}
if (vco < limits.vco.min || vco > limits.vco.max) {
dbgln_if(INTEL_GRAPHICS_DEBUG, "VCO clock invalid {}", vco);
return false;
}
return true;
}
}

18
Kernel/Graphics/Intel/Transcoder/PLL.h Normal file
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@ -0,0 +1,18 @@
/*
* Copyright (c) 2023, Liav A. <liavalb@hotmail.co.il>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include <AK/Optional.h>
#include <Kernel/Graphics/Intel/Definitions.h>
namespace Kernel::IntelGraphics {
PLLMaxSettings const& pll_max_settings_for_generation(Generation);
Optional<PLLSettings> create_pll_settings(Generation, u64 target_frequency, u64 reference_clock);
bool check_pll_settings(PLLSettings const& settings, size_t reference_clock, PLLMaxSettings const& limits);
}