From 9dfd338198bec67ebc82ed363078f9d8aa74ec3e Mon Sep 17 00:00:00 2001 From: Mark Brown Date: Wed, 4 Feb 2009 22:43:55 +0100 Subject: [PATCH] mfd: Use bulk read to fill WM8350 register cache Some I2C controllers have high overheads for setting up I2C operations which makes the register cache setup on startup excessively slow since it does a lot of small transactions. Reduce this overhead by doing a bulk read of the entire register bank and filtering out what we don't need later. Signed-off-by: Mark Brown Signed-off-by: Samuel Ortiz --- drivers/mfd/wm8350-core.c | 21 ++++++++++++--------- 1 file changed, 12 insertions(+), 9 deletions(-) diff --git a/drivers/mfd/wm8350-core.c b/drivers/mfd/wm8350-core.c index b457a05b28d..f22b18b7079 100644 --- a/drivers/mfd/wm8350-core.c +++ b/drivers/mfd/wm8350-core.c @@ -1238,7 +1238,7 @@ static int wm8350_create_cache(struct wm8350 *wm8350, int type, int mode) } wm8350->reg_cache = - kzalloc(sizeof(u16) * (WM8350_MAX_REGISTER + 1), GFP_KERNEL); + kmalloc(sizeof(u16) * (WM8350_MAX_REGISTER + 1), GFP_KERNEL); if (wm8350->reg_cache == NULL) return -ENOMEM; @@ -1246,17 +1246,20 @@ static int wm8350_create_cache(struct wm8350 *wm8350, int type, int mode) * a PMIC so the device many not be in a virgin state and we * can't rely on the silicon values. */ + ret = wm8350->read_dev(wm8350, 0, + sizeof(u16) * (WM8350_MAX_REGISTER + 1), + wm8350->reg_cache); + if (ret < 0) { + dev_err(wm8350->dev, + "failed to read initial cache values\n"); + goto out; + } + + /* Mask out uncacheable/unreadable bits and the audio. */ for (i = 0; i < WM8350_MAX_REGISTER; i++) { - /* audio register range */ if (wm8350_reg_io_map[i].readable && (i < WM8350_CLOCK_CONTROL_1 || i > WM8350_AIF_TEST)) { - ret = wm8350->read_dev(wm8350, i, 2, (char *)&value); - if (ret < 0) { - dev_err(wm8350->dev, - "failed to read initial cache value\n"); - goto out; - } - value = be16_to_cpu(value); + value = be16_to_cpu(wm8350->reg_cache[i]); value &= wm8350_reg_io_map[i].readable; value &= ~wm8350_reg_io_map[i].vol; wm8350->reg_cache[i] = value; -- 2.41.0