diff options
Diffstat (limited to 'linux')
| -rw-r--r-- | linux/drivers/media/video/cx23885/cx23885-cards.c | 2 | ||||
| -rw-r--r-- | linux/drivers/media/video/cx23885/cx23885-core.c | 8 | ||||
| -rw-r--r-- | linux/drivers/media/video/cx23885/cx23885.h | 15 |
3 files changed, 25 insertions, 0 deletions
diff --git a/linux/drivers/media/video/cx23885/cx23885-cards.c b/linux/drivers/media/video/cx23885/cx23885-cards.c index fa369ccb1..bb323ca44 100644 --- a/linux/drivers/media/video/cx23885/cx23885-cards.c +++ b/linux/drivers/media/video/cx23885/cx23885-cards.c @@ -33,6 +33,8 @@ struct cx23885_board cx23885_boards[] = { [CX23885_BOARD_UNKNOWN] = { .name = "UNKNOWN/GENERIC", + /* Ensure safe default for unknown boards */ + .clk_freq = 0, .input = {{ .type = CX23885_VMUX_COMPOSITE1, .vmux = 0, diff --git a/linux/drivers/media/video/cx23885/cx23885-core.c b/linux/drivers/media/video/cx23885/cx23885-core.c index bab45483e..d0795f70a 100644 --- a/linux/drivers/media/video/cx23885/cx23885-core.c +++ b/linux/drivers/media/video/cx23885/cx23885-core.c @@ -760,10 +760,14 @@ static int cx23885_dev_setup(struct cx23885_dev *dev) if(dev->pci->device == 0x8880) { dev->bridge = CX23885_BRIDGE_887; dev->sram_channels = cx23887_sram_channels; + /* Apply a sensible clock frequency for the PCIe bridge */ + dev->clk_freq = 25000000; } else if(dev->pci->device == 0x8852) { dev->bridge = CX23885_BRIDGE_885; dev->sram_channels = cx23885_sram_channels; + /* Apply a sensible clock frequency for the PCIe bridge */ + dev->clk_freq = 28000000; } else BUG(); @@ -783,6 +787,10 @@ static int cx23885_dev_setup(struct cx23885_dev *dev) cx23885_card_list(dev); } + /* If the user specific a clk freq override, apply it */ + if (cx23885_boards[dev->board].clk_freq > 0) + dev->clk_freq = cx23885_boards[dev->board].clk_freq; + dev->pci_bus = dev->pci->bus->number; dev->pci_slot = PCI_SLOT(dev->pci->devfn); dev->pci_irqmask = 0x001f00; diff --git a/linux/drivers/media/video/cx23885/cx23885.h b/linux/drivers/media/video/cx23885/cx23885.h index 1b7993473..84b63c2c6 100644 --- a/linux/drivers/media/video/cx23885/cx23885.h +++ b/linux/drivers/media/video/cx23885/cx23885.h @@ -103,6 +103,17 @@ typedef enum { struct cx23885_board { char *name; port_t portb, portc; + + /* Vendors can and do run the PCIe bridge at different + * clock rates, driven physically by crystals on the PCBs. + * The core has to accomodate this. This allows the user + * to add new boards with new frequencys. The value is + * expressed in Hz. + * + * The core framework will default this value based on + * current designs, but it can vary. + */ + u32 clk_freq; struct cx23885_input input[MAX_CX23885_INPUT]; }; @@ -196,6 +207,10 @@ struct cx23885_dev { int pci_irqmask; int hwrevision; + /* This valud is board specific and is used to configure the + * AV core so we see nice clean and stable video and audio. */ + u32 clk_freq; + /* I2C adapters: Master 1 & 2 (External) & Master 3 (Internal only) */ struct cx23885_i2c i2c_bus[3]; |