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Commit 23003a8496b3f8100ed215dfda438cece5745545

Authored by Daniel Kurtz
Committed by Henrik Rydberg
1 parent cf94bc09c8
Exists in smarc-l5.0.0_1.0.0-ga and in 5 other branches imx_3.10.17_1.0.1_ga, imx_3.10.53_1.1.0_ga, imx_3.14.28_1.0.0_ga, smarc-imx_3.10.53_1.1.0_ga, smarc-imx_3.14.28_1.0.0_ga

Input: atmel_mxt_ts - read ID information block in one i2c transaction 

Reading the whole info block in one i2c transaction speeds up driver
probe significantly, especially on slower i2c busses.

Signed-off-by: Daniel Kurtz <djkurtz@chromium.org>
Signed-off-by: Henrik Rydberg <rydberg@euromail.se>

Showing 1 changed file with 3 additions and 23 deletions Side-by-side Diff

drivers/input/touchscreen/atmel_mxt_ts.c
Diff comments   View file @ 23003a8
... ... @@ -36,6 +36,7 @@
36 36 #define MXT_FW_NAME "maxtouch.fw"
37 37  
38 38 /* Registers */
  39 +#define MXT_INFO 0x00
39 40 #define MXT_FAMILY_ID 0x00
40 41 #define MXT_VARIANT_ID 0x01
41 42 #define MXT_VERSION 0x02
42 43  
43 44  
... ... @@ -760,32 +761,11 @@
760 761 struct i2c_client *client = data->client;
761 762 struct mxt_info *info = &data->info;
762 763 int error;
763   - u8 val;
764 764  
765   - error = mxt_read_reg(client, MXT_FAMILY_ID, &val);
  765 + /* Read 7-byte info block starting at address 0 */
  766 + error = __mxt_read_reg(client, MXT_INFO, sizeof(*info), info);
766 767 if (error)
767 768 return error;
768   - info->family_id = val;
769   -
770   - error = mxt_read_reg(client, MXT_VARIANT_ID, &val);
771   - if (error)
772   - return error;
773   - info->variant_id = val;
774   -
775   - error = mxt_read_reg(client, MXT_VERSION, &val);
776   - if (error)
777   - return error;
778   - info->version = val;
779   -
780   - error = mxt_read_reg(client, MXT_BUILD, &val);
781   - if (error)
782   - return error;
783   - info->build = val;
784   -
785   - error = mxt_read_reg(client, MXT_OBJECT_NUM, &val);
786   - if (error)
787   - return error;
788   - info->object_num = val;
789 769  
790 770 return 0;
791 771 }