Hp pci device driver: explained and updated [2021]

Hewlett Packard (HP) is a renowned technology company that specializes in manufacturing a wide range of electronic devices and computer hardware. One important aspect of HP devices is the PCI (Peripheral Component Interconnect) bus, which allows for the seamless connection of various hardware components. To ensure the proper functioning of these devices, it is crucial to have the correct PCI device drivers installed.

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What does a PCI device driver do?

A PCI device driver is a software component that allows the operating system to communicate with and control PCI devices connected to the computer. These drivers enable the system to recognize and utilize the features and capabilities of the PCI devices. Without the proper device drivers installed, the PCI devices may not function correctly or may not be recognized by the operating system.

The responsibilities for device drivers can be divided into two categories: bus drivers and device drivers.

Bus drivers:

Bus drivers are responsible for enumerating, configuring, and controlling devices connected to the PCI bus. In the case of PCI power management (PCI-PM), the PCI driver is responsible for reading the PCI-PM registers to determine the capabilities of the hardware. When power state changes are requested, the PCI driver writes to the PCI power management registers to set the hardware to different power states (Dx states). Additionally, when a device is enabled for wake-up, the PCI driver writes to the PCI-PM registers to enable the device to fire a PME (Power Management Event). Finally, when the ACPI (Advanced Configuration and Power Interface) determines that the PCI bus is waking the system, the PCI driver scans the PCI configuration space to identify the device asserting PME, disables PME in that device, and notifies the driver for that specific device.

Device drivers:

The specific device driver for each PCI device is responsible for saving and restoring device context and requesting power state changes as the policy owner for the device. When the device driver receives a power IRP (I/O Request Packet) requesting a lower device power state change, it saves any proprietary device context needed to later turn on the device. In some cases, there may be nothing to save.

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It is important to note that the PCI-PM registers are strictly the domain of the PCI driver, and the device driver does not need to access these registers. Doing so may cause the system to function unreliably. The device driver's responsibility is to perform only proprietary actions.

Integrating ACPI and PCI-PM

Some devices, especially motherboard video devices in portable computers, may require both PCI Power Management and ACPI Source Language Assembler (ASL) to fully manage power. The PCI Power Management registers control the internal state of a device, such as internal clocks and power planes, while ASL controls the external state, such as external clocks and power planes or video backlights for video controllers. It is important to note that ASL and PCI-PM can only be combined on motherboard devices.

The OnNow architecture handles the integration of the device driver, PCI driver, and ACPI driver (and ASL) naturally. The order in which drivers are called to handle these devices depends on the specific scenario:

Scenario 1: Turning off a device

In this scenario, the device driver saves proprietary device state, the PCI driver saves Plug and Play configuration, disables the device (interrupts and BARs), and puts the device in D3 using PCI-PM registers. The ACPI driver runs ASL code to control the external state, such as power resources no longer in use.

Scenario 2: PCI power management and device drivers

In this scenario, the ACPI driver runs ASL code to control the external state, such as power resources required for OnNow operation. The PCI driver puts the device in D0 using PCI-PM registers and restores Plug and Play configuration (interrupts and BARs). The device driver restores proprietary context in the device.

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Scenario 3: Enabling wake-up

In this scenario, the device driver sets proprietary registers in the chip to enable wake-up. The PCI driver sets the wake-up enable bits in the PCI PM registers to allow the device to assert PME. The ACPI driver enables the GPE (General Purpose Event) in the chipset associated with PME.

Scenario 4: Wake-up

In this scenario, the ACPI driver wakes up and scans the GPE status bits for wake-up events. It disables GPEs for set GPE status bits and runs any associated ASL methods. In response to a wake-up notification on the PCI bus, the ACPI driver completes the PCI driver's WAIT_WAKE IRP (I/O Request Packet) to notify the PCI driver that it is waking the system. The PCI driver scans the configuration space looking for devices with a set PME status bit, disables PME, and completes the WAIT_WAKE IRP for that device to inform the driver that it is asserting wake-up. The device driver requests the device to be put in D0 and sets any proprietary registers required to handle the wake-up event.

Should I update my PCI bus driver?

It is recommended to regularly update your PCI drivers to avoid conflicts and improve the performance of your PC. Driver updates can resolve any driver conflict issues with devices and ensure stability and optimal performance. Updating drivers is especially important for Windows 10, Windows 8, Windows 7, XP, and Vista users.

To update your PCI drivers, you need to know the particular model of the PCI device you are having problems with. Once you have the details, you can visit the manufacturer's website and search for the appropriate drivers. Download and install the latest drivers for your PCI devices.

If you are unsure whether you need to update your drivers or which drivers need updating, you can use a driver update tool to scan your system for outdated, missing, or corrupt drivers. These tools can automatically download and update the drivers to the most compatible versions, saving you time and effort.

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By updating your PCI drivers, you can experience benefits such as faster internet connection and download speeds, improved PC performance for games and audio applications, and smooth operation of all your PC devices, including printers and scanners. Automatic driver updates will keep all your devices and your PC in top condition, ensuring optimal performance.

How do I update my base system device driver?

If you are experiencing issues with a base system device driver, you can manually install the driver by following these steps:

  1. Go to the Device Manager and locate the base system device needing the driver.
  2. Click on the driver tab and select update driver .
  3. Choose the option to browse your computer for drivers and navigate to the driver folder created when you ran the driver file.
  4. Make sure the include subfolders box is checked and proceed with the installation.

If the above steps do not work, you can try downloading a newer version of the driver from the manufacturer's website. Follow the same steps mentioned above, but use the updated driver file for installation.

By following these steps, you can successfully update your base system device driver and resolve any related issues.

Proper installation and updating of PCI device drivers are essential for the optimal functioning of Hewlett Packard (HP) devices. The PCI device drivers allow the operating system to communicate with and control the PCI devices, ensuring their full capabilities are utilized. By regularly updating your PCI drivers, you can avoid conflicts, improve PC performance, and ensure stability. Whether it's updating the PCI bus driver or the base system device driver, following the recommended steps will help you keep your HP devices running smoothly.

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  • What does a PCI device driver do?
  • How do I update my PCI bus driver?
  • How do I update my base system device driver?
  • Why is it important to update PCI drivers?
  • Can I update the drivers myself?

By addressing these frequently asked questions, we hope to provide a comprehensive understanding of Hewlett Packard PCI device drivers and their significance in maintaining optimal device performance.

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