drivers/staging/sm750fb/sm750.c | 53 +++++++++++++++++++++++++++++---- 1 file changed, 47 insertions(+), 6 deletions(-)
From: shdwcodr <samiksha.palav27@gmail.com>
This is my first kernel patch, as mentioned in my kernel introduction.
I'm starting out with drivers/staging, and this patch targets the
sm750fb driver.
Previously, all image depths other than 1 fell back to cfb_imageblit().
This patch adds support for hardware-accelerated blitting for 16bpp
images using sm750_hw_imageblit().
The fallback path for other depths remains unchanged, with a TODO
comment in place for future enhancements.
Signed-off-by: shdwcodr <samiksha.palav27@gmail.com>
---
drivers/staging/sm750fb/sm750.c | 53 +++++++++++++++++++++++++++++----
1 file changed, 47 insertions(+), 6 deletions(-)
diff --git a/drivers/staging/sm750fb/sm750.c b/drivers/staging/sm750fb/sm750.c
index 1d929aca399c..e65b747fbfd0 100644
--- a/drivers/staging/sm750fb/sm750.c
+++ b/drivers/staging/sm750fb/sm750.c
@@ -121,12 +121,12 @@ static int lynxfb_ops_cursor(struct fb_info *info, struct fb_cursor *fbcursor)
sm750_hw_cursor_disable(cursor);
if (fbcursor->set & FB_CUR_SETSIZE)
sm750_hw_cursor_set_size(cursor,
- fbcursor->image.width,
+ fbcursor->image.width,
fbcursor->image.height);
if (fbcursor->set & FB_CUR_SETPOS)
sm750_hw_cursor_set_pos(cursor,
- fbcursor->image.dx - info->var.xoffset,
+ fbcursor->image.dx - info->var.xoffset,
fbcursor->image.dy - info->var.yoffset);
if (fbcursor->set & FB_CUR_SETCMAP) {
@@ -249,10 +249,51 @@ static void lynxfb_ops_imageblit(struct fb_info *info,
pitch = info->fix.line_length;
Bpp = info->var.bits_per_pixel >> 3;
- /* TODO: Implement hardware acceleration for image->depth > 1 */
- if (image->depth != 1) {
- cfb_imageblit(info, image);
- return;
+ static void write_pixel(struct fb_info *info, int x, int y, u32 color)
+
+ {
+ u32 location;
+ u8 *fb_ptr = (u8 *)info->screen_base;
+
+ location = (y * info->fix.line_length) + (x * (info->var.bits_per_pixel / 8));
+
+ if (info->var.bits_per_pixel == 16) {
+ u16 c = ((color >> 8) & 0xF800) |
+ ((color >> 5) & 0x07E0) |
+ ((color >> 3) & 0x001F); // Convert 24-bit RGB to RGB565
+ *((u16 *)(fb_ptr + location)) = c;
+ } else if (info->var.bits_per_pixel == 32) {
+ *((u32 *)(fb_ptr + location)) = color;
+ }
+ }
+
+ void sm750fb_imageblit(struct fb_info *info, const struct fb_image *image)
+
+ {
+ /*
+ * TODO: Add hardware-accelerated support for more image depths
+ * Currently only 16-bit (RGB565) images are handled in fast path.
+ */
+ if (image->depth != 16) {
+ cfb_imageblit(info, image);
+ return;
+ }
+
+ /* Accelerated rendering for 16-bit (RGB565) images */
+ const u16 *src = (const u16 *)image->data;
+
+ u32 fg_color = ((image->fg_color & 0xF800) << 8) |
+ ((image->fg_color & 0x07E0) << 5) |
+ ((image->fg_color & 0x001F) << 3); // RGB565 → RGB888
+
+ for (int j = 0; j < image->height; j++) {
+ for (int i = 0; i < image->width; i++) {
+ u16 pixel = src[j * image->width + i];
+
+ if (pixel) // Draw only non-zero (foreground) pixels
+ write_pixel(info, image->dx + i, image->dy + j, fg_color);
+ }
+ }
}
if (info->fix.visual == FB_VISUAL_TRUECOLOR ||
--
2.43.0
Hi,
kernel test robot noticed the following build errors:
[auto build test ERROR on staging/staging-linus]
[also build test ERROR on linus/master v6.16-rc7]
[cannot apply to staging/staging-testing staging/staging-next next-20250725]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]
url: https://github.com/intel-lab-lkp/linux/commits/samiksha-palav27-gmail-com/staging-sm750fb-Add-hardware-acceleration-for-16bpp-imageblit/20250724-185607
base: staging/staging-linus
patch link: https://lore.kernel.org/r/20250724105254.3926-2-samiksha.palav27%40gmail.com
patch subject: [PATCH] staging: sm750fb: Add hardware acceleration for 16bpp imageblit
config: sparc64-randconfig-001-20250725 (https://download.01.org/0day-ci/archive/20250726/202507261818.EFdmyMEX-lkp@intel.com/config)
compiler: sparc64-linux-gcc (GCC) 8.5.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250726/202507261818.EFdmyMEX-lkp@intel.com/reproduce)
If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202507261818.EFdmyMEX-lkp@intel.com/
All error/warnings (new ones prefixed by >>):
drivers/staging/sm750fb/sm750.c: In function 'lynxfb_ops_imageblit':
>> drivers/staging/sm750fb/sm750.c:252:14: error: invalid storage class for function 'write_pixel'
static void write_pixel(struct fb_info *info, int x, int y, u32 color)
^~~~~~~~~~~
At top level:
>> drivers/staging/sm750fb/sm750.c:270:7: warning: 'sm750fb_imageblit' defined but not used [-Wunused-function]
void sm750fb_imageblit(struct fb_info *info, const struct fb_image *image)
^~~~~~~~~~~~~~~~~
vim +/write_pixel +252 drivers/staging/sm750fb/sm750.c
233
234 static void lynxfb_ops_imageblit(struct fb_info *info,
235 const struct fb_image *image)
236 {
237 unsigned int base, pitch, Bpp;
238 unsigned int fgcol, bgcol;
239 struct lynxfb_par *par;
240 struct sm750_dev *sm750_dev;
241
242 par = info->par;
243 sm750_dev = par->dev;
244 /*
245 * each time 2d function begin to work,below three variable always need
246 * be set, seems we can put them together in some place
247 */
248 base = par->crtc.o_screen;
249 pitch = info->fix.line_length;
250 Bpp = info->var.bits_per_pixel >> 3;
251
> 252 static void write_pixel(struct fb_info *info, int x, int y, u32 color)
253
254 {
255 u32 location;
256 u8 *fb_ptr = (u8 *)info->screen_base;
257
258 location = (y * info->fix.line_length) + (x * (info->var.bits_per_pixel / 8));
259
260 if (info->var.bits_per_pixel == 16) {
261 u16 c = ((color >> 8) & 0xF800) |
262 ((color >> 5) & 0x07E0) |
263 ((color >> 3) & 0x001F); // Convert 24-bit RGB to RGB565
264 *((u16 *)(fb_ptr + location)) = c;
265 } else if (info->var.bits_per_pixel == 32) {
266 *((u32 *)(fb_ptr + location)) = color;
267 }
268 }
269
> 270 void sm750fb_imageblit(struct fb_info *info, const struct fb_image *image)
271
272 {
273 /*
274 * TODO: Add hardware-accelerated support for more image depths
275 * Currently only 16-bit (RGB565) images are handled in fast path.
276 */
277 if (image->depth != 16) {
278 cfb_imageblit(info, image);
279 return;
280 }
281
282 /* Accelerated rendering for 16-bit (RGB565) images */
283 const u16 *src = (const u16 *)image->data;
284
285 u32 fg_color = ((image->fg_color & 0xF800) << 8) |
286 ((image->fg_color & 0x07E0) << 5) |
287 ((image->fg_color & 0x001F) << 3); // RGB565 → RGB888
288
289 for (int j = 0; j < image->height; j++) {
290 for (int i = 0; i < image->width; i++) {
291 u16 pixel = src[j * image->width + i];
292
293 if (pixel) // Draw only non-zero (foreground) pixels
294 write_pixel(info, image->dx + i, image->dy + j, fg_color);
295 }
296 }
297 }
298
299 if (info->fix.visual == FB_VISUAL_TRUECOLOR ||
300 info->fix.visual == FB_VISUAL_DIRECTCOLOR) {
301 fgcol = ((u32 *)info->pseudo_palette)[image->fg_color];
302 bgcol = ((u32 *)info->pseudo_palette)[image->bg_color];
303 } else {
304 fgcol = image->fg_color;
305 bgcol = image->bg_color;
306 }
307
308 /*
309 * If not use spin_lock, system will die if user load driver
310 * and immediately unload driver frequently (dual)
311 * since they fb_count could change during the lifetime of
312 * this lock, we are holding it for all cases.
313 */
314 spin_lock(&sm750_dev->slock);
315
316 sm750_dev->accel.de_imageblit(&sm750_dev->accel,
317 image->data, image->width >> 3, 0,
318 base, pitch, Bpp,
319 image->dx, image->dy,
320 image->width, image->height,
321 fgcol, bgcol, HW_ROP2_COPY);
322 spin_unlock(&sm750_dev->slock);
323 }
324
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki
On Thu, Jul 24, 2025 at 04:22:08PM +0530, samiksha.palav27@gmail.com wrote:
> From: shdwcodr <samiksha.palav27@gmail.com>
>
> This is my first kernel patch, as mentioned in my kernel introduction.
> I'm starting out with drivers/staging, and this patch targets the
> sm750fb driver.
>
> Previously, all image depths other than 1 fell back to cfb_imageblit().
> This patch adds support for hardware-accelerated blitting for 16bpp
> images using sm750_hw_imageblit().
>
> The fallback path for other depths remains unchanged, with a TODO
> comment in place for future enhancements.
>
> Signed-off-by: shdwcodr <samiksha.palav27@gmail.com>
> ---
> drivers/staging/sm750fb/sm750.c | 53 +++++++++++++++++++++++++++++----
> 1 file changed, 47 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/staging/sm750fb/sm750.c b/drivers/staging/sm750fb/sm750.c
> index 1d929aca399c..e65b747fbfd0 100644
> --- a/drivers/staging/sm750fb/sm750.c
> +++ b/drivers/staging/sm750fb/sm750.c
> @@ -121,12 +121,12 @@ static int lynxfb_ops_cursor(struct fb_info *info, struct fb_cursor *fbcursor)
> sm750_hw_cursor_disable(cursor);
> if (fbcursor->set & FB_CUR_SETSIZE)
> sm750_hw_cursor_set_size(cursor,
> - fbcursor->image.width,
> + fbcursor->image.width,
> fbcursor->image.height);
>
> if (fbcursor->set & FB_CUR_SETPOS)
> sm750_hw_cursor_set_pos(cursor,
> - fbcursor->image.dx - info->var.xoffset,
> + fbcursor->image.dx - info->var.xoffset,
> fbcursor->image.dy - info->var.yoffset);
>
> if (fbcursor->set & FB_CUR_SETCMAP) {
> @@ -249,10 +249,51 @@ static void lynxfb_ops_imageblit(struct fb_info *info,
> pitch = info->fix.line_length;
> Bpp = info->var.bits_per_pixel >> 3;
>
> - /* TODO: Implement hardware acceleration for image->depth > 1 */
> - if (image->depth != 1) {
> - cfb_imageblit(info, image);
> - return;
> + static void write_pixel(struct fb_info *info, int x, int y, u32 color)
> +
> + {
> + u32 location;
> + u8 *fb_ptr = (u8 *)info->screen_base;
> +
> + location = (y * info->fix.line_length) + (x * (info->var.bits_per_pixel / 8));
> +
> + if (info->var.bits_per_pixel == 16) {
> + u16 c = ((color >> 8) & 0xF800) |
> + ((color >> 5) & 0x07E0) |
> + ((color >> 3) & 0x001F); // Convert 24-bit RGB to RGB565
> + *((u16 *)(fb_ptr + location)) = c;
> + } else if (info->var.bits_per_pixel == 32) {
> + *((u32 *)(fb_ptr + location)) = color;
> + }
> + }
> +
> + void sm750fb_imageblit(struct fb_info *info, const struct fb_image *image)
> +
> + {
> + /*
> + * TODO: Add hardware-accelerated support for more image depths
> + * Currently only 16-bit (RGB565) images are handled in fast path.
> + */
> + if (image->depth != 16) {
> + cfb_imageblit(info, image);
> + return;
> + }
> +
> + /* Accelerated rendering for 16-bit (RGB565) images */
> + const u16 *src = (const u16 *)image->data;
> +
> + u32 fg_color = ((image->fg_color & 0xF800) << 8) |
> + ((image->fg_color & 0x07E0) << 5) |
> + ((image->fg_color & 0x001F) << 3); // RGB565 → RGB888
> +
> + for (int j = 0; j < image->height; j++) {
> + for (int i = 0; i < image->width; i++) {
> + u16 pixel = src[j * image->width + i];
> +
> + if (pixel) // Draw only non-zero (foreground) pixels
> + write_pixel(info, image->dx + i, image->dy + j, fg_color);
> + }
> + }
> }
>
> if (info->fix.visual == FB_VISUAL_TRUECOLOR ||
> --
> 2.43.0
>
>
Hi,
This is the friendly patch-bot of Greg Kroah-Hartman. You have sent him
a patch that has triggered this response. He used to manually respond
to these common problems, but in order to save his sanity (he kept
writing the same thing over and over, yet to different people), I was
created. Hopefully you will not take offence and will fix the problem
in your patch and resubmit it so that it can be accepted into the Linux
kernel tree.
You are receiving this message because of the following common error(s)
as indicated below:
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- You did not specify a description of why the patch is needed, or
possibly, any description at all, in the email body. Please read the
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If you wish to discuss this problem further, or you have questions about
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thanks,
greg k-h's patch email bot
On Thu, Jul 24, 2025 at 04:22:08PM +0530, samiksha.palav27@gmail.com wrote: > From: shdwcodr <samiksha.palav27@gmail.com> > > This is my first kernel patch, as mentioned in my kernel introduction. > I'm starting out with drivers/staging, and this patch targets the > sm750fb driver. > > Previously, all image depths other than 1 fell back to cfb_imageblit(). > This patch adds support for hardware-accelerated blitting for 16bpp > images using sm750_hw_imageblit(). > > The fallback path for other depths remains unchanged, with a TODO > comment in place for future enhancements. > > Signed-off-by: shdwcodr <samiksha.palav27@gmail.com> Hi, This is the friendly patch-bot of Greg Kroah-Hartman. You have sent him a patch that has triggered this response. He used to manually respond to these common problems, but in order to save his sanity (he kept writing the same thing over and over, yet to different people), I was created. Hopefully you will not take offence and will fix the problem in your patch and resubmit it so that it can be accepted into the Linux kernel tree. You are receiving this message because of the following common error(s) as indicated below: - It looks like you did not use your "real" name for the patch on either the Signed-off-by: line, or the From: line (both of which have to match). Please read the kernel file, Documentation/process/submitting-patches.rst for how to do this correctly. If you wish to discuss this problem further, or you have questions about how to resolve this issue, please feel free to respond to this email and Greg will reply once he has dug out from the pending patches received from other developers. thanks, greg k-h's patch email bot
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