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Commit 7d2ad0bd authored by Tatenda Chipeperekwa's avatar Tatenda Chipeperekwa Committed by Ajay Singh Parmar
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msm: mdss: dp: parse all sink/link status fields on HPD IRQ 



Parse all the sink/link status fields on HPD IRQ. These
fields contain update sink/link status and are needed in
order to determine whether link re-training will be
required. Furthermore, this action is mandatory as per
CTS compliance specification 1.2a.

CRs-Fixed: 1076516
Change-Id: I8c8fef768fa22c1a52f42596e3707e9b0e2c8e4d
Signed-off-by: default avatarTatenda Chipeperekwa <tatendac@codeaurora.org>
parent 40135e1f

drivers/video/fbdev/msm/mdss_dp.c

+3 −3
Original line number Diff line number Diff line
@@ -2297,11 +2297,11 @@ static void mdss_dp_process_hpd_irq_high(struct mdss_dp_drv_pdata *dp) 


	dp->hpd_irq_on = true;



	mdss_dp_aux_parse_test_request(dp);

	mdss_dp_aux_parse_sink_status_field(dp);



	if (mdss_dp_is_link_training_requested(dp)) {

		mdss_dp_send_test_response(dp);



	if (mdss_dp_is_link_training_requested(dp)) {

		pr_info("%s requested: link rate = 0x%x, lane count = 0x%x\n",

				mdss_dp_get_test_name(TEST_LINK_TRAINING),

				dp->test_data.test_link_rate,

drivers/video/fbdev/msm/mdss_dp.h

+7 −1
Original line number Diff line number Diff line
@@ -261,6 +261,11 @@ struct dpcd_test_request { 
	u32 response;

};



struct dpcd_sink_count {

	u32 count;

	bool cp_ready;

};



struct display_timing_desc {

	u32 pclk;

	u32 h_addressable; /* addressable + boder = active */
@@ -463,6 +468,7 @@ struct mdss_dp_drv_pdata { 
	void *hdcp_data;

	struct hdcp_ops *hdcp_ops;

	struct dpcd_test_request test_data;

	struct dpcd_sink_count sink_count;

};



enum dp_lane_count {
@@ -549,7 +555,7 @@ void mdss_dp_phy_initialize(struct mdss_dp_drv_pdata *dp); 


void mdss_dp_dpcd_cap_read(struct mdss_dp_drv_pdata *dp);

int mdss_dp_dpcd_status_read(struct mdss_dp_drv_pdata *dp);

void mdss_dp_aux_parse_test_request(struct mdss_dp_drv_pdata *dp);

void mdss_dp_aux_parse_sink_status_field(struct mdss_dp_drv_pdata *dp);

int mdss_dp_edid_read(struct mdss_dp_drv_pdata *dp);

int mdss_dp_link_train(struct mdss_dp_drv_pdata *dp);

void dp_aux_i2c_handler(struct mdss_dp_drv_pdata *dp, u32 isr);

drivers/video/fbdev/msm/mdss_dp_aux.c

+40 −8
Original line number Diff line number Diff line
@@ -953,10 +953,10 @@ static int dp_link_status_read(struct mdss_dp_drv_pdata *ep, int len) 
}



/**

 * dp_sink_send_test_response() - sends a test response to the sink

 * mdss_dp_aux_send_test_response() - sends a test response to the sink

 * @dp: Display Port Driver data

 */

static void dp_sink_send_test_response(struct mdss_dp_drv_pdata *dp)

void mdss_dp_aux_send_test_response(struct mdss_dp_drv_pdata *dp)

{

	char test_response[4];
@@ -1058,6 +1058,41 @@ exit: 
	return ret;

}



/**

 * dp_sink_parse_sink_count() - parses the sink count

 * @ep: Display Port Driver data

 *

 * Parses the DPCD to check if there is an update to the sink count

 * (Byte 0x200), and whether all the sink devices connected have Content

 * Protection enabled.

 */

static void dp_sink_parse_sink_count(struct mdss_dp_drv_pdata *ep)

{

	char *bp;

	char data;

	struct edp_buf *rp;

	int rlen;

	int const param_len = 0x1;

	int const sink_count_addr = 0x200;



	rlen = dp_aux_read_buf(ep, sink_count_addr, param_len, 0);

	if (rlen < param_len) {

		pr_err("failed to read sink count\n");

		return;

	}

	rp = &ep->rxp;

	bp = rp->data;

	data = *bp++;



	/* BIT 7, BIT 5:0 */

	ep->sink_count.count = (data & BIT(7)) << 6 | (data & 0x63);

	/* BIT 6*/

	ep->sink_count.cp_ready = data & BIT(6);



	pr_debug("sink_count = 0x%x, cp_ready = 0x%x\n",

			ep->sink_count.count, ep->sink_count.cp_ready);

}



/**

 * dp_is_test_supported() - checks if test requested by sink is supported

 * @test_requested: test requested by the sink
@@ -1611,14 +1646,11 @@ void mdss_dp_dpcd_cap_read(struct mdss_dp_drv_pdata *ep) 
	dp_sink_capability_read(ep, 16);

}



void mdss_dp_aux_parse_test_request(struct mdss_dp_drv_pdata *ep)

void mdss_dp_aux_parse_sink_status_field(struct mdss_dp_drv_pdata *ep)

{

	dp_sink_parse_sink_count(ep);

	dp_sink_parse_test_request(ep);

}



void mdss_dp_aux_send_test_response(struct mdss_dp_drv_pdata *ep)

{

	dp_sink_send_test_response(ep);

	dp_link_status_read(ep, 6);

}



int mdss_dp_dpcd_status_read(struct mdss_dp_drv_pdata *ep)