drivers/video: fsl-diu-fb: add default platform ops functions
The DIU driver requires some platform-specific functions to be defined, but two them can be optional because most platforms implement them the same way. Functions set_gamma_table() and get_pixel_format() are only needed because of quirks in the Freescale MPC8610 HPCD reference board. For other boards, a generic implementation works, so we shouldn't require the platform code to define them. Signed-off-by: Timur Tabi <timur@freescale.com> Signed-off-by: Florian Tobias Schandinat <FlorianSchandinat@gmx.de>
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@ -832,7 +832,8 @@ static void update_lcdc(struct fb_info *info)
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for (j = 0; j <= 255; j++)
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*gamma_table_base++ = j;
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diu_ops.set_gamma_table(data->monitor_port, data->gamma);
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if (diu_ops.set_gamma_table)
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diu_ops.set_gamma_table(data->monitor_port, data->gamma);
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disable_lcdc(info);
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@ -917,6 +918,59 @@ static int fsl_diu_set_aoi(struct fb_info *info)
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return 0;
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}
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/**
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* fsl_diu_get_pixel_format: return the pixel format for a given color depth
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*
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* The pixel format is a 32-bit value that determine which bits in each
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* pixel are to be used for each color. This is the default function used
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* if the platform does not define its own version.
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*/
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static u32 fsl_diu_get_pixel_format(unsigned int bits_per_pixel)
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{
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#define PF_BYTE_F 0x10000000
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#define PF_ALPHA_C_MASK 0x0E000000
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#define PF_ALPHA_C_SHIFT 25
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#define PF_BLUE_C_MASK 0x01800000
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#define PF_BLUE_C_SHIFT 23
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#define PF_GREEN_C_MASK 0x00600000
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#define PF_GREEN_C_SHIFT 21
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#define PF_RED_C_MASK 0x00180000
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#define PF_RED_C_SHIFT 19
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#define PF_PALETTE 0x00040000
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#define PF_PIXEL_S_MASK 0x00030000
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#define PF_PIXEL_S_SHIFT 16
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#define PF_COMP_3_MASK 0x0000F000
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#define PF_COMP_3_SHIFT 12
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#define PF_COMP_2_MASK 0x00000F00
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#define PF_COMP_2_SHIFT 8
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#define PF_COMP_1_MASK 0x000000F0
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#define PF_COMP_1_SHIFT 4
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#define PF_COMP_0_MASK 0x0000000F
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#define PF_COMP_0_SHIFT 0
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#define MAKE_PF(alpha, red, blue, green, size, c0, c1, c2, c3) \
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cpu_to_le32(PF_BYTE_F | (alpha << PF_ALPHA_C_SHIFT) | \
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(blue << PF_BLUE_C_SHIFT) | (green << PF_GREEN_C_SHIFT) | \
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(red << PF_RED_C_SHIFT) | (c3 << PF_COMP_3_SHIFT) | \
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(c2 << PF_COMP_2_SHIFT) | (c1 << PF_COMP_1_SHIFT) | \
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(c0 << PF_COMP_0_SHIFT) | (size << PF_PIXEL_S_SHIFT))
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switch (bits_per_pixel) {
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case 32:
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/* 0x88883316 */
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return MAKE_PF(3, 2, 0, 1, 3, 8, 8, 8, 8);
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case 24:
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/* 0x88082219 */
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return MAKE_PF(4, 0, 1, 2, 2, 0, 8, 8, 8);
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case 16:
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/* 0x65053118 */
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return MAKE_PF(4, 2, 1, 0, 1, 5, 6, 5, 0);
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default:
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pr_err("fsl-diu: unsupported color depth %u\n", bits_per_pixel);
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return 0;
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}
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}
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/*
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* Using the fb_var_screeninfo in fb_info we set the resolution of this
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* particular framebuffer. This function alters the fb_fix_screeninfo stored
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@ -952,8 +1006,12 @@ static int fsl_diu_set_par(struct fb_info *info)
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}
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}
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ad->pix_fmt = diu_ops.get_pixel_format(data->monitor_port,
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var->bits_per_pixel);
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if (diu_ops.get_pixel_format)
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ad->pix_fmt = diu_ops.get_pixel_format(data->monitor_port,
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var->bits_per_pixel);
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else
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ad->pix_fmt = fsl_diu_get_pixel_format(var->bits_per_pixel);
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ad->addr = cpu_to_le32(info->fix.smem_start);
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ad->src_size_g_alpha = cpu_to_le32((var->yres_virtual << 12) |
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var->xres_virtual) | mfbi->g_alpha;
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