From c771261330c90b7c77f686a1aa0fb4f756e07b5f Mon Sep 17 00:00:00 2001 From: Steven Toth Date: Thu, 10 Jan 2008 02:24:27 -0300 Subject: [PATCH] V4L/DVB (7006): cx23885: Track the board clock frequency and allow overrides The cx23885/6/8 all have different clock rates, this patch allows the core to compensate, and developers to allow vendor specific overrides. This patches will be used by future analog video and encoder patches. Signed-off-by: Steven Toth Signed-off-by: Mauro Carvalho Chehab --- drivers/media/video/cx23885/cx23885-cards.c | 2 ++ drivers/media/video/cx23885/cx23885-core.c | 8 ++++++++ drivers/media/video/cx23885/cx23885.h | 15 +++++++++++++++ 3 files changed, 25 insertions(+) diff --git a/drivers/media/video/cx23885/cx23885-cards.c b/drivers/media/video/cx23885/cx23885-cards.c index 901bebc..a4bac43c 100644 --- a/drivers/media/video/cx23885/cx23885-cards.c +++ b/drivers/media/video/cx23885/cx23885-cards.c @@ -32,6 +32,8 @@ 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/drivers/media/video/cx23885/cx23885-core.c b/drivers/media/video/cx23885/cx23885-core.c index 31723dd..8616a26 100644 --- a/drivers/media/video/cx23885/cx23885-core.c +++ b/drivers/media/video/cx23885/cx23885-core.c @@ -759,10 +759,14 @@ 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(); @@ -782,6 +786,10 @@ 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/drivers/media/video/cx23885/cx23885.h b/drivers/media/video/cx23885/cx23885.h index 48d0c87..b957242 100644 --- a/drivers/media/video/cx23885/cx23885.h +++ b/drivers/media/video/cx23885/cx23885.h @@ -100,6 +100,17 @@ 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]; }; @@ -193,6 +204,10 @@ 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]; -- 2.7.4