mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-23 17:30:02 +00:00
![Arnd Bergmann](/assets/img/avatar_default.png)
Having a local variable of 1024 bytes on 64-bit architectures is a bit too much, and I ran into this warning while trying to see what functions use the largest stack: drivers/staging/fbtft/fbtft-sysfs.c: In function 'store_gamma_curve': drivers/staging/fbtft/fbtft-sysfs.c:132:1: warning: the frame size of 1032 bytes is larger than 1024 bytes [-Wframe-larger-than=] As there is no need for 64-bit gamma values (on 32-bit architectures, we don't use those either), I'm changing the type from 'unsigned long' to 'u32' here, which cuts the required space in half everywhere. Signed-off-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
169 lines
4.5 KiB
C
169 lines
4.5 KiB
C
/*
|
|
* FB driver for the HX8347D LCD Controller
|
|
*
|
|
* Copyright (C) 2013 Christian Vogelgsang
|
|
*
|
|
* Based on driver code found here: https://github.com/watterott/r61505u-Adapter
|
|
*
|
|
* 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.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*/
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/init.h>
|
|
#include <linux/delay.h>
|
|
|
|
#include "fbtft.h"
|
|
|
|
#define DRVNAME "fb_hx8347d"
|
|
#define WIDTH 320
|
|
#define HEIGHT 240
|
|
#define DEFAULT_GAMMA "0 0 0 0 0 0 0 0 0 0 0 0 0 0\n" \
|
|
"0 0 0 0 0 0 0 0 0 0 0 0 0 0"
|
|
|
|
static int init_display(struct fbtft_par *par)
|
|
{
|
|
par->fbtftops.reset(par);
|
|
|
|
/* driving ability */
|
|
write_reg(par, 0xEA, 0x00);
|
|
write_reg(par, 0xEB, 0x20);
|
|
write_reg(par, 0xEC, 0x0C);
|
|
write_reg(par, 0xED, 0xC4);
|
|
write_reg(par, 0xE8, 0x40);
|
|
write_reg(par, 0xE9, 0x38);
|
|
write_reg(par, 0xF1, 0x01);
|
|
write_reg(par, 0xF2, 0x10);
|
|
write_reg(par, 0x27, 0xA3);
|
|
|
|
/* power voltage */
|
|
write_reg(par, 0x1B, 0x1B);
|
|
write_reg(par, 0x1A, 0x01);
|
|
write_reg(par, 0x24, 0x2F);
|
|
write_reg(par, 0x25, 0x57);
|
|
|
|
/* VCOM offset */
|
|
write_reg(par, 0x23, 0x8D); /* for flicker adjust */
|
|
|
|
/* power on */
|
|
write_reg(par, 0x18, 0x36);
|
|
write_reg(par, 0x19, 0x01); /* start osc */
|
|
write_reg(par, 0x01, 0x00); /* wakeup */
|
|
write_reg(par, 0x1F, 0x88);
|
|
mdelay(5);
|
|
write_reg(par, 0x1F, 0x80);
|
|
mdelay(5);
|
|
write_reg(par, 0x1F, 0x90);
|
|
mdelay(5);
|
|
write_reg(par, 0x1F, 0xD0);
|
|
mdelay(5);
|
|
|
|
/* color selection */
|
|
write_reg(par, 0x17, 0x05); /* 65k */
|
|
|
|
/*panel characteristic */
|
|
write_reg(par, 0x36, 0x00);
|
|
|
|
/*display on */
|
|
write_reg(par, 0x28, 0x38);
|
|
mdelay(40);
|
|
write_reg(par, 0x28, 0x3C);
|
|
|
|
/* orientation */
|
|
write_reg(par, 0x16, 0x60 | (par->bgr << 3));
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void set_addr_win(struct fbtft_par *par, int xs, int ys, int xe, int ye)
|
|
{
|
|
write_reg(par, 0x02, (xs >> 8) & 0xFF);
|
|
write_reg(par, 0x03, xs & 0xFF);
|
|
write_reg(par, 0x04, (xe >> 8) & 0xFF);
|
|
write_reg(par, 0x05, xe & 0xFF);
|
|
write_reg(par, 0x06, (ys >> 8) & 0xFF);
|
|
write_reg(par, 0x07, ys & 0xFF);
|
|
write_reg(par, 0x08, (ye >> 8) & 0xFF);
|
|
write_reg(par, 0x09, ye & 0xFF);
|
|
write_reg(par, 0x22);
|
|
}
|
|
|
|
/*
|
|
* Gamma string format:
|
|
* VRP0 VRP1 VRP2 VRP3 VRP4 VRP5 PRP0 PRP1 PKP0 PKP1 PKP2 PKP3 PKP4 CGM
|
|
* VRN0 VRN1 VRN2 VRN3 VRN4 VRN5 PRN0 PRN1 PKN0 PKN1 PKN2 PKN3 PKN4 CGM
|
|
*/
|
|
#define CURVE(num, idx) curves[num * par->gamma.num_values + idx]
|
|
static int set_gamma(struct fbtft_par *par, u32 *curves)
|
|
{
|
|
unsigned long mask[] = {
|
|
0x3f, 0x3f, 0x3f, 0x3f, 0x3f, 0x3f, 0x7f, 0x7f, 0x1f, 0x1f,
|
|
0x1f, 0x1f, 0x1f, 0x0f,
|
|
};
|
|
int i, j;
|
|
int acc = 0;
|
|
|
|
/* apply mask */
|
|
for (i = 0; i < par->gamma.num_curves; i++)
|
|
for (j = 0; j < par->gamma.num_values; j++) {
|
|
acc += CURVE(i, j);
|
|
CURVE(i, j) &= mask[j];
|
|
}
|
|
|
|
if (acc == 0) /* skip if all values are zero */
|
|
return 0;
|
|
|
|
for (i = 0; i < par->gamma.num_curves; i++) {
|
|
write_reg(par, 0x40 + (i * 0x10), CURVE(i, 0));
|
|
write_reg(par, 0x41 + (i * 0x10), CURVE(i, 1));
|
|
write_reg(par, 0x42 + (i * 0x10), CURVE(i, 2));
|
|
write_reg(par, 0x43 + (i * 0x10), CURVE(i, 3));
|
|
write_reg(par, 0x44 + (i * 0x10), CURVE(i, 4));
|
|
write_reg(par, 0x45 + (i * 0x10), CURVE(i, 5));
|
|
write_reg(par, 0x46 + (i * 0x10), CURVE(i, 6));
|
|
write_reg(par, 0x47 + (i * 0x10), CURVE(i, 7));
|
|
write_reg(par, 0x48 + (i * 0x10), CURVE(i, 8));
|
|
write_reg(par, 0x49 + (i * 0x10), CURVE(i, 9));
|
|
write_reg(par, 0x4A + (i * 0x10), CURVE(i, 10));
|
|
write_reg(par, 0x4B + (i * 0x10), CURVE(i, 11));
|
|
write_reg(par, 0x4C + (i * 0x10), CURVE(i, 12));
|
|
}
|
|
write_reg(par, 0x5D, (CURVE(1, 0) << 4) | CURVE(0, 0));
|
|
|
|
return 0;
|
|
}
|
|
|
|
#undef CURVE
|
|
|
|
static struct fbtft_display display = {
|
|
.regwidth = 8,
|
|
.width = WIDTH,
|
|
.height = HEIGHT,
|
|
.gamma_num = 2,
|
|
.gamma_len = 14,
|
|
.gamma = DEFAULT_GAMMA,
|
|
.fbtftops = {
|
|
.init_display = init_display,
|
|
.set_addr_win = set_addr_win,
|
|
.set_gamma = set_gamma,
|
|
},
|
|
};
|
|
|
|
FBTFT_REGISTER_DRIVER(DRVNAME, "himax,hx8347d", &display);
|
|
|
|
MODULE_ALIAS("spi:" DRVNAME);
|
|
MODULE_ALIAS("platform:" DRVNAME);
|
|
MODULE_ALIAS("spi:hx8347d");
|
|
MODULE_ALIAS("platform:hx8347d");
|
|
|
|
MODULE_DESCRIPTION("FB driver for the HX8347D LCD Controller");
|
|
MODULE_AUTHOR("Christian Vogelgsang");
|
|
MODULE_LICENSE("GPL");
|