[PATCH v7 1/7] fbdev/hitfb: Cast I/O offset to address

Thomas Zimmermann
2023-05-12T10:24:38Z

Cast I/O offsets to pointers to use them with I/O functions. The I/O
functions expect pointers of type 'volatile void __iomem *', but the
offsets are plain integers. Build warnings are

../drivers/video/fbdev/hitfb.c: In function 'hitfb_accel_wait':
../arch/x86/include/asm/hd64461.h:18:33: warning: passing argument 1 of 'fb_readw' makes pointer from integer without a cast [-Wint-conversion]
18 | #define HD64461_IO_OFFSET(x) (HD64461_IOBASE + (x))
| ^~~~~~~~~~~~~~~~~~~~~~
| |
| unsigned int
../arch/x86/include/asm/hd64461.h:93:33: note: in expansion of macro 'HD64461_IO_OFFSET'
93 | #define HD64461_GRCFGR HD64461_IO_OFFSET(0x1044) /* Accelerator Configuration Register */
| ^~~~~~~~~~~~~~~~~
../drivers/video/fbdev/hitfb.c:47:25: note: in expansion of macro 'HD64461_GRCFGR'
47 | while (fb_readw(HD64461_GRCFGR) & HD64461_GRCFGR_ACCSTATUS) ;
| ^~~~~~~~~~~~~~
In file included from ../arch/x86/include/asm/fb.h:15,
from ../include/linux/fb.h:19,
from ../drivers/video/fbdev/hitfb.c:22:
../include/asm-generic/fb.h:52:57: note: expected 'const volatile void *' but argument is of type 'unsigned int'
52 | static inline u16 fb_readw(const volatile void __iomem *addr)
| ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~

This patch only fixes the build warnings. It's not clear if the I/O
offsets can legally be passed to the I/O helpers. It was apparently
broken in 2007 when custom inw()/outw() helpers got removed by
commit 34a780a0afeb ("sh: hp6xx pata_platform support."). Fixing the
driver would require setting the I/O base address.

Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202305102136.eMjTSPwH-lkp@intel.com/
Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Cc: Artur Rojek <contact@artur-rojek.eu>
---
drivers/video/fbdev/hitfb.c | 122 ++++++++++++++++++++----------------
1 file changed, 69 insertions(+), 53 deletions(-)

diff --git a/drivers/video/fbdev/hitfb.c b/drivers/video/fbdev/hitfb.c
index 3033f5056976..7737923b7a0a 100644
--- a/drivers/video/fbdev/hitfb.c
+++ b/drivers/video/fbdev/hitfb.c
@@ -42,17 +42,33 @@ static struct fb_fix_screeninfo hitfb_fix = {
.accel = FB_ACCEL_NONE,
};

+static volatile void __iomem *hitfb_offset_to_addr(unsigned int offset)
+{
+ return (__force volatile void __iomem *)(uintptr_t)offset;
+}
+
+static u16 hitfb_readw(unsigned int offset)
+{
+ return fb_readw(hitfb_offset_to_addr(offset));
+}
+
+static void hitfb_writew(u16 value, unsigned int offset)
+{
+ fb_writew(value, hitfb_offset_to_addr(offset));
+}
+
static inline void hitfb_accel_wait(void)
{
- while (fb_readw(HD64461_GRCFGR) & HD64461_GRCFGR_ACCSTATUS) ;
+ while (hitfb_readw(HD64461_GRCFGR) & HD64461_GRCFGR_ACCSTATUS)
+ ;
}

static inline void hitfb_accel_start(int truecolor)
{
if (truecolor) {
- fb_writew(6, HD64461_GRCFGR);
+ hitfb_writew(6, HD64461_GRCFGR);
} else {
- fb_writew(7, HD64461_GRCFGR);
+ hitfb_writew(7, HD64461_GRCFGR);
}
}

@@ -63,11 +79,11 @@ static inline void hitfb_accel_set_dest(int truecolor, u16 dx, u16 dy,
if (truecolor)
saddr <<= 1;

- fb_writew(width-1, HD64461_BBTDWR);
- fb_writew(height-1, HD64461_BBTDHR);
+ hitfb_writew(width-1, HD64461_BBTDWR);
+ hitfb_writew(height-1, HD64461_BBTDHR);

- fb_writew(saddr & 0xffff, HD64461_BBTDSARL);
- fb_writew(saddr >> 16, HD64461_BBTDSARH);
+ hitfb_writew(saddr & 0xffff, HD64461_BBTDSARL);
+ hitfb_writew(saddr >> 16, HD64461_BBTDSARH);

}

@@ -80,7 +96,7 @@ static inline void hitfb_accel_bitblt(int truecolor, u16 sx, u16 sy, u16 dx,

height--;
width--;
- fb_writew(rop, HD64461_BBTROPR);
+ hitfb_writew(rop, HD64461_BBTROPR);
if ((sy < dy) || ((sy = dy) && (sx <= dx))) {
saddr = WIDTH * (sy + height) + sx + width;
daddr = WIDTH * (dy + height) + dx + width;
@@ -91,32 +107,32 @@ static inline void hitfb_accel_bitblt(int truecolor, u16 sx, u16 sy, u16 dx,
maddr (((width >> 4) + 1) * (height + 1) - 1) * 2;

- fb_writew((1 << 5) | 1, HD64461_BBTMDR);
+ hitfb_writew((1 << 5) | 1, HD64461_BBTMDR);
} else
- fb_writew(1, HD64461_BBTMDR);
+ hitfb_writew(1, HD64461_BBTMDR);
} else {
saddr = WIDTH * sy + sx;
daddr = WIDTH * dy + dx;
if (mask_addr) {
- fb_writew((1 << 5), HD64461_BBTMDR);
+ hitfb_writew((1 << 5), HD64461_BBTMDR);
} else {
- fb_writew(0, HD64461_BBTMDR);
+ hitfb_writew(0, HD64461_BBTMDR);
}
}
if (truecolor) {
saddr <<= 1;
daddr <<= 1;
}
- fb_writew(width, HD64461_BBTDWR);
- fb_writew(height, HD64461_BBTDHR);
- fb_writew(saddr & 0xffff, HD64461_BBTSSARL);
- fb_writew(saddr >> 16, HD64461_BBTSSARH);
- fb_writew(daddr & 0xffff, HD64461_BBTDSARL);
- fb_writew(daddr >> 16, HD64461_BBTDSARH);
+ hitfb_writew(width, HD64461_BBTDWR);
+ hitfb_writew(height, HD64461_BBTDHR);
+ hitfb_writew(saddr & 0xffff, HD64461_BBTSSARL);
+ hitfb_writew(saddr >> 16, HD64461_BBTSSARH);
+ hitfb_writew(daddr & 0xffff, HD64461_BBTDSARL);
+ hitfb_writew(daddr >> 16, HD64461_BBTDSARH);
if (mask_addr) {
maddr += mask_addr;
- fb_writew(maddr & 0xffff, HD64461_BBTMARL);
- fb_writew(maddr >> 16, HD64461_BBTMARH);
+ hitfb_writew(maddr & 0xffff, HD64461_BBTMARL);
+ hitfb_writew(maddr >> 16, HD64461_BBTMARH);
}
hitfb_accel_start(truecolor);
}
@@ -127,17 +143,17 @@ static void hitfb_fillrect(struct fb_info *p, const struct fb_fillrect *rect)
cfb_fillrect(p, rect);
else {
hitfb_accel_wait();
- fb_writew(0x00f0, HD64461_BBTROPR);
- fb_writew(16, HD64461_BBTMDR);
+ hitfb_writew(0x00f0, HD64461_BBTROPR);
+ hitfb_writew(16, HD64461_BBTMDR);

if (p->var.bits_per_pixel = 16) {
- fb_writew(((u32 *) (p->pseudo_palette))[rect->color],
+ hitfb_writew(((u32 *) (p->pseudo_palette))[rect->color],
HD64461_GRSCR);
hitfb_accel_set_dest(1, rect->dx, rect->dy, rect->width,
rect->height);
hitfb_accel_start(1);
} else {
- fb_writew(rect->color, HD64461_GRSCR);
+ hitfb_writew(rect->color, HD64461_GRSCR);
hitfb_accel_set_dest(0, rect->dx, rect->dy, rect->width,
rect->height);
hitfb_accel_start(0);
@@ -162,7 +178,7 @@ static int hitfb_pan_display(struct fb_var_screeninfo *var,
if (xoffset != 0)
return -EINVAL;

- fb_writew((yoffset*info->fix.line_length)>>10, HD64461_LCDCBAR);
+ hitfb_writew((yoffset*info->fix.line_length)>>10, HD64461_LCDCBAR);

return 0;
}
@@ -172,33 +188,33 @@ int hitfb_blank(int blank_mode, struct fb_info *info)
unsigned short v;

if (blank_mode) {
- v = fb_readw(HD64461_LDR1);
+ v = hitfb_readw(HD64461_LDR1);
v &= ~HD64461_LDR1_DON;
- fb_writew(v, HD64461_LDR1);
+ hitfb_writew(v, HD64461_LDR1);

- v = fb_readw(HD64461_LCDCCR);
+ v = hitfb_readw(HD64461_LCDCCR);
v |= HD64461_LCDCCR_MOFF;
- fb_writew(v, HD64461_LCDCCR);
+ hitfb_writew(v, HD64461_LCDCCR);

- v = fb_readw(HD64461_STBCR);
+ v = hitfb_readw(HD64461_STBCR);
v |= HD64461_STBCR_SLCDST;
- fb_writew(v, HD64461_STBCR);
+ hitfb_writew(v, HD64461_STBCR);
} else {
- v = fb_readw(HD64461_STBCR);
+ v = hitfb_readw(HD64461_STBCR);
v &= ~HD64461_STBCR_SLCDST;
- fb_writew(v, HD64461_STBCR);
+ hitfb_writew(v, HD64461_STBCR);

- v = fb_readw(HD64461_LCDCCR);
+ v = hitfb_readw(HD64461_LCDCCR);
v &= ~(HD64461_LCDCCR_MOFF | HD64461_LCDCCR_STREQ);
- fb_writew(v, HD64461_LCDCCR);
+ hitfb_writew(v, HD64461_LCDCCR);

do {
- v = fb_readw(HD64461_LCDCCR);
+ v = hitfb_readw(HD64461_LCDCCR);
} while(v&HD64461_LCDCCR_STBACK);

- v = fb_readw(HD64461_LDR1);
+ v = hitfb_readw(HD64461_LDR1);
v |= HD64461_LDR1_DON;
- fb_writew(v, HD64461_LDR1);
+ hitfb_writew(v, HD64461_LDR1);
}
return 0;
}
@@ -211,10 +227,10 @@ static int hitfb_setcolreg(unsigned regno, unsigned red, unsigned green,

switch (info->var.bits_per_pixel) {
case 8:
- fb_writew(regno << 8, HD64461_CPTWAR);
- fb_writew(red >> 10, HD64461_CPTWDR);
- fb_writew(green >> 10, HD64461_CPTWDR);
- fb_writew(blue >> 10, HD64461_CPTWDR);
+ hitfb_writew(regno << 8, HD64461_CPTWAR);
+ hitfb_writew(red >> 10, HD64461_CPTWDR);
+ hitfb_writew(green >> 10, HD64461_CPTWDR);
+ hitfb_writew(blue >> 10, HD64461_CPTWDR);
break;
case 16:
if (regno >= 16)
@@ -302,11 +318,11 @@ static int hitfb_set_par(struct fb_info *info)
break;
}

- fb_writew(info->fix.line_length, HD64461_LCDCLOR);
- ldr3 = fb_readw(HD64461_LDR3);
+ hitfb_writew(info->fix.line_length, HD64461_LCDCLOR);
+ ldr3 = hitfb_readw(HD64461_LDR3);
ldr3 &= ~15;
ldr3 |= (info->var.bits_per_pixel = 8) ? 4 : 8;
- fb_writew(ldr3, HD64461_LDR3);
+ hitfb_writew(ldr3, HD64461_LDR3);
return 0;
}

@@ -337,9 +353,9 @@ static int hitfb_probe(struct platform_device *dev)
hitfb_fix.smem_start = HD64461_IO_OFFSET(0x02000000);
hitfb_fix.smem_len = 512 * 1024;

- lcdclor = fb_readw(HD64461_LCDCLOR);
- ldvndr = fb_readw(HD64461_LDVNDR);
- ldr3 = fb_readw(HD64461_LDR3);
+ lcdclor = hitfb_readw(HD64461_LCDCLOR);
+ ldvndr = hitfb_readw(HD64461_LDVNDR);
+ ldr3 = hitfb_readw(HD64461_LDR3);

switch (ldr3 & 15) {
default:
@@ -429,9 +445,9 @@ static int hitfb_suspend(struct device *dev)
u16 v;

hitfb_blank(1,0);
- v = fb_readw(HD64461_STBCR);
+ v = hitfb_readw(HD64461_STBCR);
v |= HD64461_STBCR_SLCKE_IST;
- fb_writew(v, HD64461_STBCR);
+ hitfb_writew(v, HD64461_STBCR);

return 0;
}
@@ -440,12 +456,12 @@ static int hitfb_resume(struct device *dev)
{
u16 v;

- v = fb_readw(HD64461_STBCR);
+ v = hitfb_readw(HD64461_STBCR);
v &= ~HD64461_STBCR_SLCKE_OST;
msleep(100);
- v = fb_readw(HD64461_STBCR);
+ v = hitfb_readw(HD64461_STBCR);
v &= ~HD64461_STBCR_SLCKE_IST;
- fb_writew(v, HD64461_STBCR);
+ hitfb_writew(v, HD64461_STBCR);
hitfb_blank(0,0);

return 0;
--
2.40.1