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Commit ef869fd4 authored by Ujwal Patel's avatar Ujwal Patel Committed by Gerrit - the friendly Code Review server
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msm: mdss: Add support to halt MDSS axi ports 



Add a utility to halt MDSS axi ports. This utility can be called during
deep suspend, display off or for debugging purposes. On success it should
be assumed that AXI ports are in idle state and would not fetch any more
data.

Change-Id: Iaec2c7f56cf77ff3db0e634cb4ea843da023be9b
Signed-off-by: default avatarUjwal Patel <ujwalp@codeaurora.org>
parent fa5225f6

drivers/video/msm/mdss/mdss_mdp.c

+49 −0
Original line number Diff line number Diff line
@@ -25,6 +25,7 @@ 
#include <linux/interrupt.h>

#include <linux/io.h>

#include <linux/iommu.h>

#include <linux/iopoll.h>

#include <linux/of.h>

#include <linux/of_address.h>

#include <linux/pm.h>
@@ -55,6 +56,8 @@ 
#include "mdss_panel.h"

#include "mdss_debug.h"



#define AXI_HALT_TIMEOUT_US	0x4000



struct mdss_data_type *mdss_res;



static int mdss_fb_mem_get_iommu_domain(void)
@@ -135,6 +138,52 @@ static int mdss_mdp_parse_dt_misc(struct platform_device *pdev); 
static int mdss_mdp_parse_dt_ad_cfg(struct platform_device *pdev);

static int mdss_mdp_parse_dt_bus_scale(struct platform_device *pdev);



/**

 * mdss_mdp_vbif_axi_halt() - Halt MDSS AXI ports

 * @mdata: pointer to the global mdss data structure.

 *

 * Check if MDSS AXI ports are idle or not. If not send a halt request and

 * wait for it be idle.

 *

 * This function can be called during deep suspend, display off or for

 * debugging purposes. On success it should be assumed that AXI ports are in

 * idle state and would not fetch any more data. This function cannot be

 * called from interrupt context.

 */

int mdss_mdp_vbif_axi_halt(struct mdss_data_type *mdata)

{

	bool is_idle;

	int rc = 0;

	u32 reg_val, idle_mask, status;



	idle_mask = BIT(4);

	if (mdata->axi_port_cnt == 2)

		idle_mask |= BIT(5);



	mdss_mdp_clk_ctrl(MDP_BLOCK_POWER_ON, false);

	reg_val = readl_relaxed(mdata->vbif_base + MMSS_VBIF_AXI_HALT_CTRL1);



	is_idle = (reg_val & idle_mask) ? true : false;

	if (!is_idle) {

		pr_err("axi is not idle. halt_ctrl1=%d\n", reg_val);



		writel_relaxed(1, mdata->vbif_base + MMSS_VBIF_AXI_HALT_CTRL0);



		rc = readl_poll_timeout(mdata->vbif_base +

			MMSS_VBIF_AXI_HALT_CTRL1, status, (status & idle_mask),

			1000, AXI_HALT_TIMEOUT_US);

		if (rc == -ETIMEDOUT)

			pr_err("VBIF axi is not halting. TIMEDOUT.\n");

		else

			pr_debug("VBIF axi is halted\n");



		writel_relaxed(0, mdata->vbif_base + MMSS_VBIF_AXI_HALT_CTRL0);

	}

	mdss_mdp_clk_ctrl(MDP_BLOCK_POWER_OFF, false);



	return rc;

}



u32 mdss_mdp_fb_stride(u32 fb_index, u32 xres, int bpp)

{

	/* The adreno GPU hardware requires that the pitch be aligned to

drivers/video/msm/mdss/mdss_mdp.h

+1 −0
Original line number Diff line number Diff line
@@ -639,6 +639,7 @@ int mdss_mdp_pipe_destroy(struct mdss_mdp_pipe *pipe); 
int mdss_mdp_pipe_queue_data(struct mdss_mdp_pipe *pipe,

			     struct mdss_mdp_data *src_data);

int mdss_mdp_pipe_fetch_halt(struct mdss_mdp_pipe *pipe);

int mdss_mdp_vbif_axi_halt(struct mdss_data_type *mdata);



int mdss_mdp_data_check(struct mdss_mdp_data *data,

			struct mdss_mdp_plane_sizes *ps);

drivers/video/msm/mdss/mdss_mdp_hwio.h

+2 −0
Original line number Diff line number Diff line
@@ -569,5 +569,7 @@ enum mdss_mdp_pingpong_index { 
/* following offsets are with respect to MDP VBIF base */

#define MMSS_VBIF_XIN_HALT_CTRL0	0x200

#define MMSS_VBIF_XIN_HALT_CTRL1	0x204

#define MMSS_VBIF_AXI_HALT_CTRL0	0x208

#define MMSS_VBIF_AXI_HALT_CTRL1	0x20C



#endif