Re: [PATCH v2 16/26] fbdev: Add JZ4740 framebuffer driver
From: Jaya Kumar
Date: Thu Jul 08 2010 - 21:26:58 EST
On Mon, Jul 5, 2010 at 6:27 AM, Lars-Peter Clausen <lars@xxxxxxxxxx> wrote:
> Hi Andrew
>
> v2 of this patch has been around for two weeks without any comments. I've fixed all
> the issues you had with v1. If you this version is ok, an Acked-By would be nice :)
>
> Thanks
> - Lars
>
> Lars-Peter Clausen wrote:
>> This patch adds support for the LCD controller on JZ4740 SoCs.
Hi Lars, Andrew,
I think this driver looks okay but I had some quick questions:
>> +config FB_JZ4740
>> + tristate "JZ4740 LCD framebuffer support"
>> + depends on FB
>> + select FB_SYS_FILLRECT
>> + select FB_SYS_COPYAREA
>> + select FB_SYS_IMAGEBLIT
Out of curiosity, why FB_SYS and not FB_CFB? The users of FB_SYS are
drivers that use virtual memory for their framebuffer. I didn't see
any vmalloc in this driver.
>> + help
>> + Framebuffer support for the JZ4740 SoC.
>> +
>> source "drivers/video/omap/Kconfig"
>> source "drivers/video/omap2/Kconfig"
>>
>> diff --git a/drivers/video/Makefile b/drivers/video/Makefile
>> index 3c3bf86..fd2df57 100644
>> --- a/drivers/video/Makefile
>> +++ b/drivers/video/Makefile
>> @@ -132,6 +132,7 @@ obj-$(CONFIG_FB_CARMINE) += carminefb.o
>> obj-$(CONFIG_FB_MB862XX) += mb862xx/
>> obj-$(CONFIG_FB_MSM) += msm/
>> obj-$(CONFIG_FB_NUC900) += nuc900fb.o
>> +obj-$(CONFIG_FB_JZ4740) += jz4740_fb.o
Just a minor nit, the typical naming in fbdev appears to be
controllerfb.c as opposed to controller_fb.c .
>>
>> # Platform or fallback drivers go here
>> obj-$(CONFIG_FB_UVESA) += uvesafb.o
>> diff --git a/drivers/video/jz4740_fb.c b/drivers/video/jz4740_fb.c
>> new file mode 100644
>> index 0000000..8d03181
>> --- /dev/null
>> +++ b/drivers/video/jz4740_fb.c
>> @@ -0,0 +1,817 @@
>> +/*
>> + * Copyright (C) 2009-2010, Lars-Peter Clausen <lars@xxxxxxxxxx>
>> + * JZ4740 SoC LCD framebuffer driver
>> + *
>> + * This program is free software; you can redistribute it and/or modify it
>> + * under the terms of the GNU General Public License as published by the
>> + * Free Software Foundation; either version 2 of the License, or (at your
>> + * option) any later version.
>> + *
>> + * You should have received a copy of the GNU General Public License along
>> + * with this program; if not, write to the Free Software Foundation, Inc.,
>> + * 675 Mass Ave, Cambridge, MA 02139, USA.
>> + *
>> + */
>> +
>> +#include <linux/kernel.h>
>> +#include <linux/module.h>
>> +#include <linux/mutex.h>
>> +#include <linux/platform_device.h>
>> +
>> +#include <linux/clk.h>
>> +#include <linux/delay.h>
>> +
>> +#include <linux/console.h>
>> +#include <linux/fb.h>
>> +
>> +#include <linux/dma-mapping.h>
>> +
>> +#include <linux/jz4740_fb.h>
I see a lot of register defines below. Is there any reason why they
shouldn't go in above j*fb.h? Also, I'm not sure if linux/j*.h is the
best place. I think most fbdev drivers place their headers in
drivers/video itself unless they need to share something driver
specific with userspace which is rare. Is there a specific reason why
you put it in include/linux?
>> +#include <asm/mach-jz4740/gpio.h>
>> +
>> +#define JZ_REG_LCD_CFG 0x00
>> +#define JZ_REG_LCD_VSYNC 0x04
>> +#define JZ_REG_LCD_HSYNC 0x08
>> +#define JZ_REG_LCD_VAT 0x0C
>> +#define JZ_REG_LCD_DAH 0x10
>> +#define JZ_REG_LCD_DAV 0x14
>> +#define JZ_REG_LCD_PS 0x18
>> +#define JZ_REG_LCD_CLS 0x1C
>> +#define JZ_REG_LCD_SPL 0x20
>> +#define JZ_REG_LCD_REV 0x24
>> +#define JZ_REG_LCD_CTRL 0x30
>> +#define JZ_REG_LCD_STATE 0x34
>> +#define JZ_REG_LCD_IID 0x38
>> +#define JZ_REG_LCD_DA0 0x40
>> +#define JZ_REG_LCD_SA0 0x44
>> +#define JZ_REG_LCD_FID0 0x48
>> +#define JZ_REG_LCD_CMD0 0x4C
>> +#define JZ_REG_LCD_DA1 0x50
>> +#define JZ_REG_LCD_SA1 0x54
>> +#define JZ_REG_LCD_FID1 0x58
>> +#define JZ_REG_LCD_CMD1 0x5C
>> +
>> +#define JZ_LCD_CFG_SLCD BIT(31)
>> +#define JZ_LCD_CFG_PS_DISABLE BIT(23)
>> +#define JZ_LCD_CFG_CLS_DISABLE BIT(22)
>> +#define JZ_LCD_CFG_SPL_DISABLE BIT(21)
>> +#define JZ_LCD_CFG_REV_DISABLE BIT(20)
>> +#define JZ_LCD_CFG_HSYNCM BIT(19)
>> +#define JZ_LCD_CFG_PCLKM BIT(18)
>> +#define JZ_LCD_CFG_INV BIT(17)
>> +#define JZ_LCD_CFG_SYNC_DIR BIT(16)
>> +#define JZ_LCD_CFG_PS_POLARITY BIT(15)
>> +#define JZ_LCD_CFG_CLS_POLARITY BIT(14)
>> +#define JZ_LCD_CFG_SPL_POLARITY BIT(13)
>> +#define JZ_LCD_CFG_REV_POLARITY BIT(12)
>> +#define JZ_LCD_CFG_HSYNC_ACTIVE_LOW BIT(11)
>> +#define JZ_LCD_CFG_PCLK_FALLING_EDGE BIT(10)
>> +#define JZ_LCD_CFG_DE_ACTIVE_LOW BIT(9)
>> +#define JZ_LCD_CFG_VSYNC_ACTIVE_LOW BIT(8)
>> +#define JZ_LCD_CFG_18_BIT BIT(7)
>> +#define JZ_LCD_CFG_PDW (BIT(5) | BIT(4))
>> +#define JZ_LCD_CFG_MODE_MASK 0xf
>> +
>> +#define JZ_LCD_CTRL_BURST_4 (0x0 << 28)
>> +#define JZ_LCD_CTRL_BURST_8 (0x1 << 28)
>> +#define JZ_LCD_CTRL_BURST_16 (0x2 << 28)
>> +#define JZ_LCD_CTRL_RGB555 BIT(27)
>> +#define JZ_LCD_CTRL_OFUP BIT(26)
>> +#define JZ_LCD_CTRL_FRC_GRAYSCALE_16 (0x0 << 24)
>> +#define JZ_LCD_CTRL_FRC_GRAYSCALE_4 (0x1 << 24)
>> +#define JZ_LCD_CTRL_FRC_GRAYSCALE_2 (0x2 << 24)
>> +#define JZ_LCD_CTRL_PDD_MASK (0xff << 16)
>> +#define JZ_LCD_CTRL_EOF_IRQ BIT(13)
>> +#define JZ_LCD_CTRL_SOF_IRQ BIT(12)
>> +#define JZ_LCD_CTRL_OFU_IRQ BIT(11)
>> +#define JZ_LCD_CTRL_IFU0_IRQ BIT(10)
>> +#define JZ_LCD_CTRL_IFU1_IRQ BIT(9)
>> +#define JZ_LCD_CTRL_DD_IRQ BIT(8)
>> +#define JZ_LCD_CTRL_QDD_IRQ BIT(7)
>> +#define JZ_LCD_CTRL_REVERSE_ENDIAN BIT(6)
>> +#define JZ_LCD_CTRL_LSB_FISRT BIT(5)
>> +#define JZ_LCD_CTRL_DISABLE BIT(4)
>> +#define JZ_LCD_CTRL_ENABLE BIT(3)
>> +#define JZ_LCD_CTRL_BPP_1 0x0
>> +#define JZ_LCD_CTRL_BPP_2 0x1
>> +#define JZ_LCD_CTRL_BPP_4 0x2
>> +#define JZ_LCD_CTRL_BPP_8 0x3
>> +#define JZ_LCD_CTRL_BPP_15_16 0x4
>> +#define JZ_LCD_CTRL_BPP_18_24 0x5
>> +
>> +#define JZ_LCD_CMD_SOF_IRQ BIT(15)
>> +#define JZ_LCD_CMD_EOF_IRQ BIT(16)
>> +#define JZ_LCD_CMD_ENABLE_PAL BIT(12)
>> +
>> +#define JZ_LCD_SYNC_MASK 0x3ff
>> +
>> +#define JZ_LCD_STATE_DISABLED BIT(0)
>> +
>> +struct jzfb_framedesc {
>> + uint32_t next;
>> + uint32_t addr;
>> + uint32_t id;
>> + uint32_t cmd;
>> +} __packed;
>> +
>> +struct jzfb {
>> + struct fb_info *fb;
>> + struct platform_device *pdev;
>> + void __iomem *base;
>> + struct resource *mem;
>> + struct jz4740_fb_platform_data *pdata;
>> +
>> + size_t vidmem_size;
>> + void *vidmem;
>> + dma_addr_t vidmem_phys;
>> + struct jzfb_framedesc *framedesc;
>> + dma_addr_t framedesc_phys;
>> +
>> + struct clk *ldclk;
>> + struct clk *lpclk;
>> +
>> + unsigned is_enabled:1;
Out of curiosity, why the bitfield?
>> + struct mutex lock;
>> +
>> + uint32_t pseudo_palette[16];
>> +};
>> +
>> +static const struct fb_fix_screeninfo jzfb_fix __devinitdata = {
>> + .id = "JZ4740 FB",
>> + .type = FB_TYPE_PACKED_PIXELS,
>> + .visual = FB_VISUAL_TRUECOLOR,
>> + .xpanstep = 0,
>> + .ypanstep = 0,
>> + .ywrapstep = 0,
>> + .accel = FB_ACCEL_NONE,
>> +};
>> +
>> +static const struct jz_gpio_bulk_request jz_lcd_ctrl_pins[] = {
>> + JZ_GPIO_BULK_PIN(LCD_PCLK),
>> + JZ_GPIO_BULK_PIN(LCD_HSYNC),
>> + JZ_GPIO_BULK_PIN(LCD_VSYNC),
>> + JZ_GPIO_BULK_PIN(LCD_DE),
>> + JZ_GPIO_BULK_PIN(LCD_PS),
>> + JZ_GPIO_BULK_PIN(LCD_REV),
>> +};
>> +
>> +static const struct jz_gpio_bulk_request jz_lcd_data_pins[] = {
>> + JZ_GPIO_BULK_PIN(LCD_DATA0),
>> + JZ_GPIO_BULK_PIN(LCD_DATA1),
>> + JZ_GPIO_BULK_PIN(LCD_DATA2),
>> + JZ_GPIO_BULK_PIN(LCD_DATA3),
>> + JZ_GPIO_BULK_PIN(LCD_DATA4),
>> + JZ_GPIO_BULK_PIN(LCD_DATA5),
>> + JZ_GPIO_BULK_PIN(LCD_DATA6),
>> + JZ_GPIO_BULK_PIN(LCD_DATA7),
>> + JZ_GPIO_BULK_PIN(LCD_DATA8),
>> + JZ_GPIO_BULK_PIN(LCD_DATA9),
>> + JZ_GPIO_BULK_PIN(LCD_DATA10),
>> + JZ_GPIO_BULK_PIN(LCD_DATA11),
>> + JZ_GPIO_BULK_PIN(LCD_DATA12),
>> + JZ_GPIO_BULK_PIN(LCD_DATA13),
>> + JZ_GPIO_BULK_PIN(LCD_DATA14),
>> + JZ_GPIO_BULK_PIN(LCD_DATA15),
>> + JZ_GPIO_BULK_PIN(LCD_DATA16),
>> + JZ_GPIO_BULK_PIN(LCD_DATA17),
>> +};
>> +
>> +static unsigned int jzfb_num_ctrl_pins(struct jzfb *jzfb)
>> +{
>> + unsigned int num;
>> +
>> + switch (jzfb->pdata->lcd_type) {
>> + case JZ_LCD_TYPE_GENERIC_16_BIT:
>> + num = 4;
>> + break;
>> + case JZ_LCD_TYPE_GENERIC_18_BIT:
>> + num = 4;
>> + break;
>> + case JZ_LCD_TYPE_8BIT_SERIAL:
>> + num = 3;
>> + break;
The lcd type serial looks interesting to me. It'd be nice to have some
descriptive comments so that we know what its used with.
>> + default:
>> + num = 0;
>> + break;
>> + }
>> + return num;
>> +}
>> +
>> +static unsigned int jzfb_num_data_pins(struct jzfb *jzfb)
>> +{
>> + unsigned int num;
>> +
>> + switch (jzfb->pdata->lcd_type) {
>> + case JZ_LCD_TYPE_GENERIC_16_BIT:
>> + num = 16;
>> + break;
>> + case JZ_LCD_TYPE_GENERIC_18_BIT:
>> + num = 18;
>> + break;
>> + case JZ_LCD_TYPE_8BIT_SERIAL:
>> + num = 8;
>> + break;
>> + default:
>> + num = 0;
>> + break;
>> + }
>> + return num;
>> +}
>> +
>> +/* Based on CNVT_TOHW macro from skeletonfb.c */
>> +static inline uint32_t jzfb_convert_color_to_hw(unsigned val,
>> + struct fb_bitfield *bf)
>> +{
>> + return (((val << bf->length) + 0x7FFF - val) >> 16) << bf->offset;
>> +}
>> +
>> +static int jzfb_setcolreg(unsigned regno, unsigned red, unsigned green,
>> + unsigned blue, unsigned transp, struct fb_info *fb)
>> +{
>> + uint32_t color;
>> +
>> + if (regno >= 16)
>> + return -EINVAL;
>> +
>> + color = jzfb_convert_color_to_hw(red, &fb->var.red);
>> + color |= jzfb_convert_color_to_hw(green, &fb->var.green);
>> + color |= jzfb_convert_color_to_hw(blue, &fb->var.blue);
>> + color |= jzfb_convert_color_to_hw(transp, &fb->var.transp);
>> +
>> + ((uint32_t *)(fb->pseudo_palette))[regno] = color;
>> +
>> + return 0;
>> +}
>> +
>> +static int jzfb_get_controller_bpp(struct jzfb *jzfb)
>> +{
>> + switch (jzfb->pdata->bpp) {
>> + case 18:
>> + case 24:
>> + return 32;
>> + case 15:
>> + return 16;
>> + default:
>> + return jzfb->pdata->bpp;
>> + }
>> +}
>> +
>> +static struct fb_videomode *jzfb_get_mode(struct jzfb *jzfb,
>> + struct fb_var_screeninfo *var)
>> +{
>> + size_t i;
>> + struct fb_videomode *mode = jzfb->pdata->modes;
>> +
>> + for (i = 0; i < jzfb->pdata->num_modes; ++i, ++mode) {
>> + if (mode->xres == var->xres && mode->yres == var->yres)
>> + return mode;
>> + }
>> +
>> + return NULL;
>> +}
>> +
>> +static int jzfb_check_var(struct fb_var_screeninfo *var, struct fb_info *fb)
>> +{
>> + struct jzfb *jzfb = fb->par;
>> + struct fb_videomode *mode;
>> +
>> + if (var->bits_per_pixel != jzfb_get_controller_bpp(jzfb) &&
>> + var->bits_per_pixel != jzfb->pdata->bpp)
>> + return -EINVAL;
>> +
>> + mode = jzfb_get_mode(jzfb, var);
>> + if (mode == NULL)
>> + return -EINVAL;
>> +
>> + fb_videomode_to_var(var, mode);
>> +
>> + switch (jzfb->pdata->bpp) {
>> + case 8:
>> + break;
>> + case 15:
>> + var->red.offset = 10;
>> + var->red.length = 5;
>> + var->green.offset = 6;
>> + var->green.length = 5;
>> + var->blue.offset = 0;
>> + var->blue.length = 5;
>> + break;
>> + case 16:
>> + var->red.offset = 11;
>> + var->red.length = 5;
>> + var->green.offset = 5;
>> + var->green.length = 6;
>> + var->blue.offset = 0;
>> + var->blue.length = 5;
>> + break;
>> + case 18:
>> + var->red.offset = 16;
>> + var->red.length = 6;
>> + var->green.offset = 8;
>> + var->green.length = 6;
>> + var->blue.offset = 0;
>> + var->blue.length = 6;
>> + var->bits_per_pixel = 32;
>> + break;
>> + case 32:
>> + case 24:
>> + var->transp.offset = 24;
>> + var->transp.length = 8;
>> + var->red.offset = 16;
>> + var->red.length = 8;
>> + var->green.offset = 8;
>> + var->green.length = 8;
>> + var->blue.offset = 0;
>> + var->blue.length = 8;
>> + var->bits_per_pixel = 32;
>> + break;
>> + default:
>> + break;
>> + }
>> +
>> + return 0;
>> +}
>> +
>> +static int jzfb_set_par(struct fb_info *info)
>> +{
>> + struct jzfb *jzfb = info->par;
>> + struct fb_var_screeninfo *var = &info->var;
>> + struct fb_videomode *mode;
>> + uint16_t hds, vds;
>> + uint16_t hde, vde;
>> + uint16_t ht, vt;
>> + uint32_t ctrl;
>> + uint32_t cfg;
>> + unsigned long rate;
>> +
>> + mode = jzfb_get_mode(jzfb, var);
>> + if (mode == NULL)
>> + return -EINVAL;
>> +
>> + if (mode == info->mode)
>> + return 0;
>> +
>> + info->mode = mode;
>> +
>> + hds = mode->hsync_len + mode->left_margin;
>> + hde = hds + mode->xres;
>> + ht = hde + mode->right_margin;
>> +
>> + vds = mode->vsync_len + mode->upper_margin;
>> + vde = vds + mode->yres;
>> + vt = vde + mode->lower_margin;
>> +
>> + ctrl = JZ_LCD_CTRL_OFUP | JZ_LCD_CTRL_BURST_16;
>> +
>> + switch (jzfb->pdata->bpp) {
>> + case 1:
>> + ctrl |= JZ_LCD_CTRL_BPP_1;
>> + break;
>> + case 2:
>> + ctrl |= JZ_LCD_CTRL_BPP_2;
>> + break;
>> + case 4:
>> + ctrl |= JZ_LCD_CTRL_BPP_4;
>> + break;
>> + case 8:
>> + ctrl |= JZ_LCD_CTRL_BPP_8;
>> + break;
>> + case 15:
>> + ctrl |= JZ_LCD_CTRL_RGB555; /* Falltrough */
>> + case 16:
>> + ctrl |= JZ_LCD_CTRL_BPP_15_16;
>> + break;
>> + case 18:
>> + case 24:
>> + case 32:
>> + ctrl |= JZ_LCD_CTRL_BPP_18_24;
>> + break;
>> + default:
>> + break;
>> + }
>> +
>> + cfg = JZ_LCD_CFG_PS_DISABLE | JZ_LCD_CFG_CLS_DISABLE |
>> + JZ_LCD_CFG_SPL_DISABLE | JZ_LCD_CFG_REV_DISABLE;
>> +
>> + if (!(mode->sync & FB_SYNC_HOR_HIGH_ACT))
>> + cfg |= JZ_LCD_CFG_HSYNC_ACTIVE_LOW;
>> +
>> + if (!(mode->sync & FB_SYNC_VERT_HIGH_ACT))
>> + cfg |= JZ_LCD_CFG_VSYNC_ACTIVE_LOW;
>> +
>> + if (jzfb->pdata->pixclk_falling_edge)
>> + cfg |= JZ_LCD_CFG_PCLK_FALLING_EDGE;
>> +
>> + if (jzfb->pdata->date_enable_active_low)
>> + cfg |= JZ_LCD_CFG_DE_ACTIVE_LOW;
>> +
>> + if (jzfb->pdata->lcd_type == JZ_LCD_TYPE_GENERIC_18_BIT)
>> + cfg |= JZ_LCD_CFG_18_BIT;
>> +
>> + cfg |= jzfb->pdata->lcd_type & 0xf;
>> +
>> + if (mode->pixclock) {
>> + rate = PICOS2KHZ(mode->pixclock) * 1000;
>> + mode->refresh = rate / vt / ht;
>> + } else {
>> + if (jzfb->pdata->lcd_type == JZ_LCD_TYPE_8BIT_SERIAL)
>> + rate = mode->refresh * (vt + 2 * mode->xres) * ht;
>> + else
>> + rate = mode->refresh * vt * ht;
>> +
>> + mode->pixclock = KHZ2PICOS(rate / 1000);
>> + }
>> +
>> + mutex_lock(&jzfb->lock);
>> + if (!jzfb->is_enabled)
>> + clk_enable(jzfb->ldclk);
>> + else
>> + ctrl |= JZ_LCD_CTRL_ENABLE;
>> +
>> + writel(mode->hsync_len, jzfb->base + JZ_REG_LCD_HSYNC);
>> + writel(mode->vsync_len, jzfb->base + JZ_REG_LCD_VSYNC);
>> +
>> + writel((ht << 16) | vt, jzfb->base + JZ_REG_LCD_VAT);
>> +
>> + writel((hds << 16) | hde, jzfb->base + JZ_REG_LCD_DAH);
>> + writel((vds << 16) | vde, jzfb->base + JZ_REG_LCD_DAV);
>> +
>> + writel(cfg, jzfb->base + JZ_REG_LCD_CFG);
>> +
>> + writel(ctrl, jzfb->base + JZ_REG_LCD_CTRL);
>> +
>> + if (!jzfb->is_enabled)
>> + clk_disable(jzfb->ldclk);
>> +
>> + mutex_unlock(&jzfb->lock);
>> +
>> + clk_set_rate(jzfb->lpclk, rate);
>> + clk_set_rate(jzfb->ldclk, rate * 3);
>> +
>> + return 0;
>> +}
>> +
>> +static void jzfb_enable(struct jzfb *jzfb)
>> +{
>> + uint32_t ctrl;
>> +
>> + clk_enable(jzfb->ldclk);
>> +
>> + jz_gpio_bulk_resume(jz_lcd_ctrl_pins, jzfb_num_ctrl_pins(jzfb));
>> + jz_gpio_bulk_resume(jz_lcd_data_pins, jzfb_num_data_pins(jzfb));
>> +
>> + writel(0, jzfb->base + JZ_REG_LCD_STATE);
>> +
>> + writel(jzfb->framedesc->next, jzfb->base + JZ_REG_LCD_DA0);
>> +
>> + ctrl = readl(jzfb->base + JZ_REG_LCD_CTRL);
>> + ctrl |= JZ_LCD_CTRL_ENABLE;
>> + ctrl &= ~JZ_LCD_CTRL_DISABLE;
>> + writel(ctrl, jzfb->base + JZ_REG_LCD_CTRL);
>> +}
>> +
>> +static void jzfb_disable(struct jzfb *jzfb)
>> +{
>> + uint32_t ctrl;
>> +
>> + ctrl = readl(jzfb->base + JZ_REG_LCD_CTRL);
>> + ctrl |= JZ_LCD_CTRL_DISABLE;
>> + writel(ctrl, jzfb->base + JZ_REG_LCD_CTRL);
>> + do {
>> + ctrl = readl(jzfb->base + JZ_REG_LCD_STATE);
>> + } while (!(ctrl & JZ_LCD_STATE_DISABLED));
>> +
>> + jz_gpio_bulk_suspend(jz_lcd_ctrl_pins, jzfb_num_ctrl_pins(jzfb));
>> + jz_gpio_bulk_suspend(jz_lcd_data_pins, jzfb_num_data_pins(jzfb));
>> +
>> + clk_disable(jzfb->ldclk);
>> +}
>> +
>> +static int jzfb_blank(int blank_mode, struct fb_info *info)
>> +{
>> + struct jzfb *jzfb = info->par;
>> +
>> + switch (blank_mode) {
>> + case FB_BLANK_UNBLANK:
>> + mutex_lock(&jzfb->lock);
>> + if (jzfb->is_enabled) {
>> + mutex_unlock(&jzfb->lock);
>> + return 0;
>> + }
>> +
>> + jzfb_enable(jzfb);
>> + jzfb->is_enabled = 1;
>> +
>> + mutex_unlock(&jzfb->lock);
>> + break;
>> + default:
>> + mutex_lock(&jzfb->lock);
>> + if (!jzfb->is_enabled) {
>> + mutex_unlock(&jzfb->lock);
>> + return 0;
>> + }
>> +
>> + jzfb_disable(jzfb);
>> + jzfb->is_enabled = 0;
>> +
>> + mutex_unlock(&jzfb->lock);
>> + break;
>> + }
>> +
>> + return 0;
>> +}
>> +
>> +static int jzfb_alloc_devmem(struct jzfb *jzfb)
>> +{
>> + int max_videosize = 0;
>> + struct fb_videomode *mode = jzfb->pdata->modes;
>> + void *page;
>> + int i;
>> +
>> + for (i = 0; i < jzfb->pdata->num_modes; ++mode, ++i) {
>> + if (max_videosize < mode->xres * mode->yres)
>> + max_videosize = mode->xres * mode->yres;
>> + }
>> +
>> + max_videosize *= jzfb_get_controller_bpp(jzfb) >> 3;
>> +
>> + jzfb->framedesc = dma_alloc_coherent(&jzfb->pdev->dev,
>> + sizeof(*jzfb->framedesc),
>> + &jzfb->framedesc_phys, GFP_KERNEL);
>> +
>> + if (!jzfb->framedesc)
>> + return -ENOMEM;
>> +
>> + jzfb->vidmem_size = PAGE_ALIGN(max_videosize);
>> + jzfb->vidmem = dma_alloc_coherent(&jzfb->pdev->dev,
>> + jzfb->vidmem_size,
>> + &jzfb->vidmem_phys, GFP_KERNEL);
>> +
>> + if (!jzfb->vidmem)
>> + goto err_free_framedesc;
>> +
>> + for (page = jzfb->vidmem;
>> + page < jzfb->vidmem + PAGE_ALIGN(jzfb->vidmem_size);
>> + page += PAGE_SIZE) {
>> + SetPageReserved(virt_to_page(page));
>> + }
It'd be nice to know the reasoning for the SetPageReserved.
Thanks,
jaya
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