Hi, On 3/2/20 12:30 PM, Bastien Nocera wrote:
On Fri, 2020-02-21 at 17:47 +0100, Hans de Goede wrote:Save a copy of the config in goodix_read_config(), this is a preparation patch for restoring the config if it was lost after a supend/resume cycle.Is "fix" really the best verb for this "calculate checksum"?
Good point, I've renamed fix_config to calc_config_checksum for v2.
BugLink: https://bugzilla.redhat.com/show_bug.cgi?id=1786317 BugLink: https://github.com/nexus511/gpd-ubuntu-packages/issues/10 BugLink: https://bugzilla.kernel.org/show_bug.cgi?id=199207 Cc: Dmitry Mastykin <mastichi@xxxxxxxxx> Signed-off-by: Hans de Goede <hdegoede@xxxxxxxxxx>Looks fine apart from the nitpicks. Reviewed-by: Bastien Nocera <hadess@xxxxxxxxxx>--- drivers/input/touchscreen/goodix.c | 51 ++++++++++++++++++++++++++ ---- 1 file changed, 45 insertions(+), 6 deletions(-) diff --git a/drivers/input/touchscreen/goodix.c b/drivers/input/touchscreen/goodix.c index 66d6bb74507d..21be33384d14 100644 --- a/drivers/input/touchscreen/goodix.c +++ b/drivers/input/touchscreen/goodix.c @@ -72,6 +72,7 @@ struct goodix_chip_data { u16 config_addr; int config_len; int (*check_config)(struct goodix_ts_data *, const struct firmware *); + void (*fix_config)(struct goodix_ts_data *ts); };struct goodix_ts_data {@@ -96,35 +97,42 @@ struct goodix_ts_data { unsigned long irq_flags; enum goodix_irq_pin_access_method irq_pin_access_method; unsigned int contact_size; + u8 config[GOODIX_CONFIG_MAX_LENGTH]; };static int goodix_check_cfg_8(struct goodix_ts_data *ts,const struct firmware *cfg); static int goodix_check_cfg_16(struct goodix_ts_data *ts, const struct firmware *cfg); +static void goodix_fix_cfg_8(struct goodix_ts_data *ts); +static void goodix_fix_cfg_16(struct goodix_ts_data *ts);static const struct goodix_chip_data gt1x_chip_data = {.config_addr = GOODIX_GT1X_REG_CONFIG_DATA, .config_len = GOODIX_CONFIG_MAX_LENGTH, .check_config = goodix_check_cfg_16, + .fix_config = goodix_fix_cfg_16, };static const struct goodix_chip_data gt911_chip_data = {.config_addr = GOODIX_GT9X_REG_CONFIG_DATA, .config_len = GOODIX_CONFIG_911_LENGTH, .check_config = goodix_check_cfg_8, + .fix_config = goodix_fix_cfg_8, };static const struct goodix_chip_data gt967_chip_data = {.config_addr = GOODIX_GT9X_REG_CONFIG_DATA, .config_len = GOODIX_CONFIG_967_LENGTH, .check_config = goodix_check_cfg_8, + .fix_config = goodix_fix_cfg_8, };static const struct goodix_chip_data gt9x_chip_data = {.config_addr = GOODIX_GT9X_REG_CONFIG_DATA, .config_len = GOODIX_CONFIG_MAX_LENGTH, .check_config = goodix_check_cfg_8, + .fix_config = goodix_fix_cfg_8, };static const unsigned long goodix_irq_flags[] = {@@ -442,6 +450,19 @@ static int goodix_check_cfg_8(struct goodix_ts_data *ts, return 0; }+static void goodix_fix_cfg_8(struct goodix_ts_data *ts)+{ + int i, raw_cfg_len = ts->chip->config_len - 2; + u8 check_sum = 0; + + for (i = 0; i < raw_cfg_len; i++) + check_sum += ts->config[i]; + check_sum = (~check_sum) + 1; + + ts->config[raw_cfg_len] = check_sum; + ts->config[raw_cfg_len + 1] = 1;Would be good to mention that this is the "config_fresh" bit, in this function and others.
Will fix for v2.
+} + static int goodix_check_cfg_16(struct goodix_ts_data *ts, const struct firmware *cfg) { @@ -466,6 +487,19 @@ static int goodix_check_cfg_16(struct goodix_ts_data *ts, return 0; }+static void goodix_fix_cfg_16(struct goodix_ts_data *ts)+{ + int i, raw_cfg_len = ts->chip->config_len - 3; + u16 check_sum = 0; + + for (i = 0; i < raw_cfg_len; i += 2) + check_sum += get_unaligned_be16(&ts->config[i]); + check_sum = (~check_sum) + 1; + + put_unaligned_be16(check_sum, &ts->config[raw_cfg_len]); + ts->config[raw_cfg_len + 2] = 1; +} + /** * goodix_check_cfg - Checks if config fw is valid * @@ -828,12 +862,11 @@ static int goodix_get_gpio_config(struct goodix_ts_data *ts) */ static void goodix_read_config(struct goodix_ts_data *ts) { - u8 config[GOODIX_CONFIG_MAX_LENGTH]; int x_max, y_max; int error;error = goodix_i2c_read(ts->client, ts->chip->config_addr,- config, ts->chip->config_len); + ts->config, ts->chip->config_len); if (error) { dev_warn(&ts->client->dev, "Error reading config: %d\n", error); @@ -842,15 +875,21 @@ static void goodix_read_config(struct goodix_ts_data *ts) return; }- ts->int_trigger_type = config[TRIGGER_LOC] & 0x03;- ts->max_touch_num = config[MAX_CONTACTS_LOC] & 0x0f; + ts->int_trigger_type = ts->config[TRIGGER_LOC] & 0x03; + ts->max_touch_num = ts->config[MAX_CONTACTS_LOC] & 0x0f;- x_max = get_unaligned_le16(&config[RESOLUTION_LOC]);- y_max = get_unaligned_le16(&config[RESOLUTION_LOC + 2]); + x_max = get_unaligned_le16(&ts->config[RESOLUTION_LOC]); + y_max = get_unaligned_le16(&ts->config[RESOLUTION_LOC + 2]); if (x_max && y_max) { input_abs_set_max(ts->input_dev, ABS_MT_POSITION_X, x_max - 1); input_abs_set_max(ts->input_dev, ABS_MT_POSITION_Y, y_max - 1); } + + /* + * Ensure valid checksum and config_fresh bit being set for possible + * re-upload of config after suspend/resume. + */I think that the explanation should ultimately be shorter if the vfunc was better named.+ ts->chip->fix_config(ts); }/**
Regards, Hans
