i2c: designware: Drop hard coded FIFO depth assignment

It's not clear why the commit fe20ff5c
  ("i2c-designware: Add support for Designware core behind PCI devices.")
followed by commit b61b1415
  ("i2c-designware: add support for Intel Lynxpoint")
chose to hard code FIFO depth size. The FIFO depth on all hardware,
I have tested on, can be nicely detected automatically.

Thus, we may safely drop hard coded FIFO sizes from the driver.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: Jarkko Nikula <jarkko.nikula@linux.intel.com>
Signed-off-by: Wolfram Sang <wsa@kernel.org>

drivers/i2c/busses/i2c-designware-common.c

@@ -200,9 +200,6 @@ int i2c_dw_acpi_configure(struct device *device)
 	struct i2c_timings *t = &dev->timings;
 	u32 ss_ht = 0, fp_ht = 0, hs_ht = 0, fs_ht = 0;
 
-	dev->tx_fifo_depth = 32;
-	dev->rx_fifo_depth = 32;
-
 	/*
 	 * Try to get SDA hold time and *CNT values from an ACPI method for
 	 * selected speed modes.

drivers/i2c/busses/i2c-designware-pcidrv.c

@@ -46,8 +46,6 @@ struct dw_scl_sda_cfg {
 
 struct dw_pci_controller {
 	u32 bus_num;
-	u32 tx_fifo_depth;
-	u32 rx_fifo_depth;
 	u32 flags;
 	struct dw_scl_sda_cfg *scl_sda_cfg;
 	int (*setup)(struct pci_dev *pdev, struct dw_pci_controller *c);
@@ -133,41 +131,29 @@ static u32 ehl_get_clk_rate_khz(struct dw_i2c_dev *dev)
 static struct dw_pci_controller dw_pci_controllers[] = {
 	[medfield] = {
 		.bus_num = -1,
-		.tx_fifo_depth = 32,
-		.rx_fifo_depth = 32,
 		.setup = mfld_setup,
 		.get_clk_rate_khz = mfld_get_clk_rate_khz,
 	},
 	[merrifield] = {
 		.bus_num = -1,
-		.tx_fifo_depth = 64,
-		.rx_fifo_depth = 64,
 		.scl_sda_cfg = &mrfld_config,
 		.setup = mrfld_setup,
 	},
 	[baytrail] = {
 		.bus_num = -1,
-		.tx_fifo_depth = 32,
-		.rx_fifo_depth = 32,
 		.scl_sda_cfg = &byt_config,
 	},
 	[haswell] = {
 		.bus_num = -1,
-		.tx_fifo_depth = 32,
-		.rx_fifo_depth = 32,
 		.scl_sda_cfg = &hsw_config,
 	},
 	[cherrytrail] = {
 		.bus_num = -1,
-		.tx_fifo_depth = 32,
-		.rx_fifo_depth = 32,
 		.flags = MODEL_CHERRYTRAIL,
 		.scl_sda_cfg = &byt_config,
 	},
 	[elkhartlake] = {
 		.bus_num = -1,
-		.tx_fifo_depth = 32,
-		.rx_fifo_depth = 32,
 		.get_clk_rate_khz = ehl_get_clk_rate_khz,
 	},
 };
@@ -277,9 +263,6 @@ static int i2c_dw_pci_probe(struct pci_dev *pdev,
 		dev->sda_hold_time = cfg->sda_hold;
 	}
 
-	dev->tx_fifo_depth = controller->tx_fifo_depth;
-	dev->rx_fifo_depth = controller->rx_fifo_depth;
-
 	adap = &dev->adapter;
 	adap->owner = THIS_MODULE;
 	adap->class = 0;