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Commit 2d62ccb1 authored by Satya Rama Aditya Pinapala's avatar Satya Rama Aditya Pinapala Committed by Gerrit - the friendly Code Review server
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disp: msm: add func to parse pll_codes from dfps_data_region 



Add function to parse pll_codes from dfps_data_region, and the
pll_codes are used as trim_codes for RFI.

Change-Id: Ic81529cd685f17012809fb68cefc4b36cb1172ca
Signed-off-by: default avatarSatya Rama Aditya Pinapala <psraditya30@codeaurora.org>
parent 4b24ccb9

msm/dsi/dsi_pll.c

+65 −0
Original line number Diff line number Diff line
@@ -11,6 +11,7 @@ 
#include <linux/err.h>

#include <linux/delay.h>

#include <linux/iopoll.h>

#include <linux/of_address.h>

#include "dsi_pll.h"



static int dsi_pll_clock_register(struct platform_device *pdev,
@@ -51,6 +52,67 @@ static inline int dsi_pll_get_ioresources(struct platform_device *pdev, 
	return rc;

}



static void dsi_pll_free_bootmem(u32 mem_addr, u32 size)

{

	unsigned long pfn_start, pfn_end, pfn_idx;



	pfn_start = mem_addr >> PAGE_SHIFT;

	pfn_end = (mem_addr + size) >> PAGE_SHIFT;

	for (pfn_idx = pfn_start; pfn_idx < pfn_end; pfn_idx++)

		free_reserved_page(pfn_to_page(pfn_idx));

}



static void dsi_pll_parse_dfps(struct platform_device *pdev,

				struct dsi_pll_resource *pll_res)

{

	struct device_node *pnode = NULL;

	const u32 *addr;

	void *trim_codes = NULL;

	u64 size;

	u32 offsets[2];



	pnode = of_parse_phandle(pdev->dev.of_node, "memory-region", 0);

	if (IS_ERR_OR_NULL(pnode)) {

		DSI_PLL_INFO(pll_res, "of_parse_phandle failed\n");

		goto node_err;

	}



	addr = of_get_address(pnode, 0, &size, NULL);

	if (!addr) {

		DSI_PLL_ERR(pll_res,

			"failed to parse the dfps memory address\n");

		goto node_err;

	}



	/* maintain compatibility for 32/64 bit */

	offsets[0] = (u32) of_read_ulong(addr, 2);

	offsets[1] = (u32) size;



	trim_codes = memremap(offsets[0], offsets[1], MEMREMAP_WB);

	if (!trim_codes)

		goto mem_err;



	pll_res->dfps = kzalloc(sizeof(struct dfps_info), GFP_KERNEL);

	if (IS_ERR_OR_NULL(pll_res->dfps)) {

		DSI_PLL_ERR(pll_res, "pll_res->dfps allocate failed\n");

		goto mem_err;

	}



	/* memcopy complete dfps structure from kernel virtual memory */

	memcpy_fromio(pll_res->dfps, trim_codes, sizeof(struct dfps_info));



mem_err:

	if (trim_codes)

		memunmap(trim_codes);



	/* free the dfps memory here */

	dsi_pll_free_bootmem(offsets[0], offsets[1]);



node_err:

	if (pnode)

		of_node_put(pnode);

}



int dsi_pll_init(struct platform_device *pdev, struct dsi_pll_resource **pll)

{

	int rc = 0;
@@ -145,6 +207,9 @@ int dsi_pll_init(struct platform_device *pdev, struct dsi_pll_resource **pll) 
		return -EINVAL;

	}



	if (!(pll_res->index))

		dsi_pll_parse_dfps(pdev, pll_res);



	return rc;



}