i2c: designware-pci: Set ideal timing parameters for Elkhart Lake PSE

Set optimal HCNT, LCNT and hold time values for all the speeds supported
in Intel Programmable Service Engine I2C controller in Intel Elkhart
Lake.

Signed-off-by: Lakshmi Sowjanya D <lakshmi.sowjanya.d@intel.com>
Acked-by: Jarkko Nikula <jarkko.nikula@linux.intel.com>
Signed-off-by: Wolfram Sang <wsa@kernel.org>

diff --git a/drivers/i2c/busses/i2c-designware-pcidrv.c b/drivers/i2c/busses/i2c-designware-pcidrv.c
index 174938f..3418148 100644 (file)
--- a/drivers/i2c/busses/i2c-designware-pcidrv.c
+++ b/drivers/i2c/busses/i2c-designware-pcidrv.c
@@ -84,6 +84,19 @@ static struct dw_scl_sda_cfg hsw_config = {
        .sda_hold = 0x9,
 };
 
+/* Elkhart Lake HCNT/LCNT/SDA hold time */
+static struct dw_scl_sda_cfg ehl_config = {
+       .ss_hcnt = 0x190,
+       .fs_hcnt = 0x4E,
+       .fp_hcnt = 0x1A,
+       .hs_hcnt = 0x1F,
+       .ss_lcnt = 0x1d6,
+       .fs_lcnt = 0x96,
+       .fp_lcnt = 0x32,
+       .hs_lcnt = 0x36,
+       .sda_hold = 0x1E,
+};
+
 /* NAVI-AMD HCNT/LCNT/SDA hold time */
 static struct dw_scl_sda_cfg navi_amd_config = {
        .ss_hcnt = 0x1ae,
@@ -200,6 +213,7 @@ static struct dw_pci_controller dw_pci_controllers[] = {
        },
        [elkhartlake] = {
                .bus_num = -1,
+               .scl_sda_cfg = &ehl_config,
                .get_clk_rate_khz = ehl_get_clk_rate_khz,
        },
        [navi_amd] = {