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Input: elants_i2c - use DMA safe i2c when possible

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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>
This commit is contained in:
Stephen Boyd 2018-10-10 15:50:50 -07:00 committed by Dmitry Torokhov
parent dde2744321
commit 00f73f9752
1 changed files with 4 additions and 3 deletions
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7
drivers/input/touchscreen/elants_i2c.c
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@ -147,10 +147,11 @@ struct elants_data {
u8 cmd_resp[HEADER_SIZE]; u8 cmd_resp[HEADER_SIZE];
struct completion cmd_done; struct completion cmd_done;
u8 buf[MAX_PACKET_SIZE];
bool wake_irq_enabled; bool wake_irq_enabled;
bool keep_power_in_suspend; 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, 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 i;
int len; 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) { if (len < 0) {
dev_err(&client->dev, "%s: failed to read data: %d\n", dev_err(&client->dev, "%s: failed to read data: %d\n",
__func__, len); __func__, len);