diff options
| author | Stephen Boyd <swboyd@chromium.org> | 2018-10-10 15:50:50 -0700 |
|---|---|---|
| committer | Dmitry Torokhov <dmitry.torokhov@gmail.com> | 2018-10-10 17:10:40 -0700 |
| commit | 00f73f97527f6ea8b4bc2bc63c44299bcc2f5cab (patch) | |
| tree | 22cdc496989587a749f3cbbc745ca96a73dce36b | |
| parent | dde27443211062e841806feaf690674b7c3a599f (diff) | |
| download | blackbird-op-linux-00f73f97527f6ea8b4bc2bc63c44299bcc2f5cab.tar.gz blackbird-op-linux-00f73f97527f6ea8b4bc2bc63c44299bcc2f5cab.zip | |
Input: elants_i2c - use DMA safe i2c when possible
To avoid bounce buffer when an i2c controller decides to use DMA for a
transaction, let's make out buffer that we use for reads DMA-safe and let
the master know that DMAing into it is safe.
Signed-off-by: Stephen Boyd <swboyd@chromium.org>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
| -rw-r--r-- | drivers/input/touchscreen/elants_i2c.c | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/drivers/input/touchscreen/elants_i2c.c b/drivers/input/touchscreen/elants_i2c.c index d21ca39b0fdb..f2cb23121833 100644 --- a/drivers/input/touchscreen/elants_i2c.c +++ b/drivers/input/touchscreen/elants_i2c.c @@ -147,10 +147,11 @@ struct elants_data { u8 cmd_resp[HEADER_SIZE]; struct completion cmd_done; - u8 buf[MAX_PACKET_SIZE]; - bool wake_irq_enabled; bool keep_power_in_suspend; + + /* Must be last to be used for DMA operations */ + u8 buf[MAX_PACKET_SIZE] ____cacheline_aligned; }; static int elants_i2c_send(struct i2c_client *client, @@ -863,7 +864,7 @@ static irqreturn_t elants_i2c_irq(int irq, void *_dev) int i; int len; - len = i2c_master_recv(client, ts->buf, sizeof(ts->buf)); + len = i2c_master_recv_dmasafe(client, ts->buf, sizeof(ts->buf)); if (len < 0) { dev_err(&client->dev, "%s: failed to read data: %d\n", __func__, len); |
