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path: root/drivers/ata/ahci_brcm.c
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2018-01-17ata: ahci_brcm: Recover from failures to identify devicesFlorian Fainelli1-8/+87
When powering up, the SATA controller may fail to mount the HDD. The SATA controller will lock up, preventing it from negotiating to a lower speed or transmitting data. Root cause is power supply noise creating resonance at 6 Ghz and 3 GHz frequencies, which causes instability in the Clock-Data Recovery (CDR) frontend module, resulting in false acquisition of the clock at SATA 6G/3G speeds. The SATA controller may fail to mount the HDD and lock up, requiring a power cycle. Broadcom chips suspected of being susceptible to this issue include BCM7445, BCM7439, and BCM7366. The Kernel implements an error recovery mechanism that resets the SATA PHY and digital controller when the controller locks up. During this error recovery process, typically there is less activity on the board and Broadcom STB chip, so that the power supply is less noisy, thus allowing the SATA controller to lock correctly. Signed-off-by: Florian Fainelli <f.fainelli@gmail.com> Signed-off-by: Tejun Heo <tj@kernel.org>
2018-01-02ata: ahci_brcm: Avoid clobbering SATA_TOP_CTRL_BUS_CTRLFlorian Fainelli1-10/+15
We are doing a blind write to SATA_TOP_CTRL_BUS_CTRL to set the system endian, but in doing so, we are also overwriting other bits, such as the SATA_SCB_BURST_SIZE and SATA_FIFO_SIZE bits, which impact performance. Do a read/modify/write so we keep the default values. While we are at it, we also greatly simplify the logic and just leave the NSP specific bit settings, instead of having a completely different sequence. Signed-off-by: Florian Fainelli <f.fainelli@gmail.com> Signed-off-by: Tejun Heo <tj@kernel.org>
2017-06-22ata: ahci_brcm: Avoid writing to read-only registersDoug Berger1-8/+4
This commit makes use of the AHCI_HFLAG_YES_ALPM flag to prevent the driver from writing to the read-only Host Capability register. It also sets the AHCI_HFLAG_NO_WRITE_TO_RO flag to prevent the AHCI library from writing to read-only registers. Signed-off-by: Doug Berger <opendmb@gmail.com> Signed-off-by: Tejun Heo <tj@kernel.org>
2016-06-16ata: ahci_brcm: Add support for Broadcom NSP SoCYendapally Reddy Dhananjaya Reddy1-10/+36
Add SATA3 support for Broadcom NSP SoC Signed-off-by: Yendapally Reddy Dhananjaya Reddy <yendapally.reddy@broadcom.com> Acked-by: Florian Fainelli <f.fainelli@gmail.com> Signed-off-by: Tejun Heo <tj@kernel.org>
2016-06-16ata: ahci_brcmstb: rename to support across Broadcom SoC'sYendapally Reddy Dhananjaya Reddy1-0/+380
Rename the existing Broadcom STB ahci driver to common Broadcom SATA3 driver to share this across Broadcom SoCs. Signed-off-by: Yendapally Reddy Dhananjaya Reddy <yendapally.reddy@broadcom.com> Acked-by: Florian Fainelli <f.fainelli@gmail.com> Signed-off-by: Tejun Heo <tj@kernel.org>