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usb: phy: omap_usb_phy: Fix USB3_PHY DPLL configuration

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The index returned by get_sys_clk_index() is not exactly what we expect.
Let's not rely on that and use get_sys_clk_freq() instead.

This fixes missing USB3 devices in the Linux kernel when USB is started
in u-boot. It still doesn't fix missing USB3 devices in u-boot though.

Signed-off-by: Roger Quadros <rogerq@ti.com>
This commit is contained in:
Roger Quadros 2016-05-23 17:37:50 +03:00 committed by Tom Rini
parent 3599774eec
commit 68a775a766
1 changed files with 42 additions and 16 deletions
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58
drivers/usb/phy/omap_usb_phy.c
View file

@ -23,7 +23,7 @@
#include "../host/xhci.h"
#ifdef CONFIG_OMAP_USB3PHY1_HOST
struct usb_dpll_params {
struct usb3_dpll_params {
u16 m;
u8 n;
u8 freq:3;
@ -31,17 +31,39 @@ struct usb_dpll_params {
u32 mf;
};
#define NUM_USB_CLKS 6
static struct usb_dpll_params omap_usb3_dpll_params[NUM_USB_CLKS] = {
{1250, 5, 4, 20, 0}, /* 12 MHz */
{3125, 20, 4, 20, 0}, /* 16.8 MHz */
{1172, 8, 4, 20, 65537}, /* 19.2 MHz */
{1250, 12, 4, 20, 0}, /* 26 MHz */
{3125, 47, 4, 20, 92843}, /* 38.4 MHz */
{1000, 7, 4, 10, 0}, /* 20 MHz */
struct usb3_dpll_map {
unsigned long rate;
struct usb3_dpll_params params;
struct usb3_dpll_map *dpll_map;
};
static struct usb3_dpll_map dpll_map_usb[] = {
{12000000, {1250, 5, 4, 20, 0} }, /* 12 MHz */
{16800000, {3125, 20, 4, 20, 0} }, /* 16.8 MHz */
{19200000, {1172, 8, 4, 20, 65537} }, /* 19.2 MHz */
{20000000, {1000, 7, 4, 10, 0} }, /* 20 MHz */
{26000000, {1250, 12, 4, 20, 0} }, /* 26 MHz */
{38400000, {3125, 47, 4, 20, 92843} }, /* 38.4 MHz */
{ }, /* Terminator */
};
static struct usb3_dpll_params *omap_usb3_get_dpll_params(void)
{
unsigned long rate;
struct usb3_dpll_map *dpll_map = dpll_map_usb;
rate = get_sys_clk_freq();
for (; dpll_map->rate; dpll_map++) {
if (rate == dpll_map->rate)
return &dpll_map->params;
}
dev_err(phy->dev, "No DPLL configuration for %lu Hz SYS CLK\n", rate);
return NULL;
}
static void omap_usb_dpll_relock(struct omap_usb3_phy *phy_regs)
{
u32 val;
@ -56,32 +78,36 @@ static void omap_usb_dpll_relock(struct omap_usb3_phy *phy_regs)
static void omap_usb_dpll_lock(struct omap_usb3_phy *phy_regs)
{
u32 clk_index = get_sys_clk_index();
struct usb3_dpll_params *dpll_params;
u32 val;
dpll_params = omap_usb3_get_dpll_params();
if (!dpll_params)
return;
val = readl(&phy_regs->pll_config_1);
val &= ~PLL_REGN_MASK;
val |= omap_usb3_dpll_params[clk_index].n << PLL_REGN_SHIFT;
val |= dpll_params->n << PLL_REGN_SHIFT;
writel(val, &phy_regs->pll_config_1);
val = readl(&phy_regs->pll_config_2);
val &= ~PLL_SELFREQDCO_MASK;
val |= omap_usb3_dpll_params[clk_index].freq << PLL_SELFREQDCO_SHIFT;
val |= dpll_params->freq << PLL_SELFREQDCO_SHIFT;
writel(val, &phy_regs->pll_config_2);
val = readl(&phy_regs->pll_config_1);
val &= ~PLL_REGM_MASK;
val |= omap_usb3_dpll_params[clk_index].m << PLL_REGM_SHIFT;
val |= dpll_params->m << PLL_REGM_SHIFT;
writel(val, &phy_regs->pll_config_1);
val = readl(&phy_regs->pll_config_4);
val &= ~PLL_REGM_F_MASK;
val |= omap_usb3_dpll_params[clk_index].mf << PLL_REGM_F_SHIFT;
val |= dpll_params->mf << PLL_REGM_F_SHIFT;
writel(val, &phy_regs->pll_config_4);
val = readl(&phy_regs->pll_config_3);
val &= ~PLL_SD_MASK;
val |= omap_usb3_dpll_params[clk_index].sd << PLL_SD_SHIFT;
val |= dpll_params->sd << PLL_SD_SHIFT;
writel(val, &phy_regs->pll_config_3);
omap_usb_dpll_relock(phy_regs);