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Commit fbd5e77e authored by Ferruh Yigit's avatar Ferruh Yigit Committed by Dmitry Torokhov
Browse files

Input: cyttsp - add missing handshake 



For the devices that has blocking with timeout communication, these
extra handshakes will prevent one timeout delay in startup sequence

Tested-by: Ferruh Yigit <fery@cypress.com> on TMA300-DVK
Signed-off-by: default avatarFerruh Yigit <fery@cypress.com>
Acked-by: default avatarJavier Martinez Canillas <javier@dowhile0.org>
Signed-off-by: default avatarDmitry Torokhov <dmitry.torokhov@gmail.com>
parent d2983cdb

drivers/input/touchscreen/cyttsp_core.c

+20 −6
Original line number Diff line number Diff line
@@ -116,6 +116,15 @@ static int ttsp_send_command(struct cyttsp *ts, u8 cmd) 
	return ttsp_write_block_data(ts, CY_REG_BASE, sizeof(cmd), &cmd);

}



static int cyttsp_handshake(struct cyttsp *ts)

{

	if (ts->pdata->use_hndshk)

		return ttsp_send_command(ts,

				ts->xy_data.hst_mode ^ CY_HNDSHK_BIT);



	return 0;

}



static int cyttsp_load_bl_regs(struct cyttsp *ts)

{

	memset(&ts->bl_data, 0, sizeof(ts->bl_data));
@@ -167,6 +176,10 @@ static int cyttsp_set_operational_mode(struct cyttsp *ts) 
	if (error)

		return error;



	error = cyttsp_handshake(ts);

	if (error)

		return error;



	return ts->xy_data.act_dist == CY_ACT_DIST_DFLT ? -EIO : 0;

}
@@ -188,6 +201,10 @@ static int cyttsp_set_sysinfo_mode(struct cyttsp *ts) 
	if (error)

		return error;



	error = cyttsp_handshake(ts);

	if (error)

		return error;



	if (!ts->sysinfo_data.tts_verh && !ts->sysinfo_data.tts_verl)

		return -EIO;
@@ -344,12 +361,9 @@ static irqreturn_t cyttsp_irq(int irq, void *handle) 
		goto out;



	/* provide flow control handshake */

	if (ts->pdata->use_hndshk) {

		error = ttsp_send_command(ts,

				ts->xy_data.hst_mode ^ CY_HNDSHK_BIT);

	error = cyttsp_handshake(ts);

	if (error)

		goto out;

	}



	if (unlikely(ts->state == CY_IDLE_STATE))

		goto out;