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Commit 00f73f97 authored by Stephen Boyd's avatar Stephen Boyd Committed by Dmitry Torokhov
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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: default avatarStephen Boyd <swboyd@chromium.org>
Signed-off-by: default avatarDmitry Torokhov <dmitry.torokhov@gmail.com>
parent dde27443

drivers/input/touchscreen/elants_i2c.c

+4 −3
Original line number Diff line number Diff line
@@ -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);