1 // SPDX-License-Identifier: GPL-2.0-only
29  * Trims identical data from front and back of line
30  * Sets new front buffer address and width
33  * for back and front buffer ptrs and width
40 	const unsigned long *front = (const unsigned long *) *bfront;
44 	int end = width;
47 		if (back[j] != front[j]) {
53 	for (k = width - 1; k > j; k--) {
54 		if (back[k] != front[k]) {
55 			end = k+1;
60 	identical = start + (width - end);
61 	*bfront = (u8 *) &front[start];
62 	*width_bytes = (end - start) * sizeof(unsigned long);
125 	       (cmd_buffer_end - MIN_RLX_CMD_BYTES > cmd)) {  in udl_compress_hline16()
145 					(unsigned long)(pixel_end - pixel) >> log_bpp,  in udl_compress_hline16()
146 					(unsigned long)(cmd_buffer_end - 1 - cmd) / 2) << log_bpp);  in udl_compress_hline16()
168 				*raw_pixels_count_byte = (((start -  in udl_compress_hline16()
172 				*cmd++ = (((pixel - start) >> log_bpp) - 1) & 0xFF;  in udl_compress_hline16()
182 			*raw_pixels_count_byte = ((pixel - raw_pixel_start) >> log_bpp) & 0xFF;  in udl_compress_hline16()
185 			cmd--;  in udl_compress_hline16()
188 		*cmd_pixels_count_byte = ((pixel - cmd_pixel_start) >> log_bpp) & 0xFF;  in udl_compress_hline16()
189 		dev_addr += ((pixel - cmd_pixel_start) >> log_bpp) * 2;  in udl_compress_hline16()
193 		/* Fill leftover bytes with no-ops */  in udl_compress_hline16()
195 			memset(cmd, 0xAF, cmd_buffer_end - cmd);  in udl_compress_hline16()
207  * There are 3 copies of every pixel: The front buffer that the fbdev
213 		     const char *front, char **urb_buf_ptr,  in udl_render_hline()  argument
221 	u8 *cmd_end = (u8 *) urb->transfer_buffer + urb->transfer_buffer_length;  in udl_render_hline()
225 	line_start = (u8 *) (front + byte_offset);  in udl_render_hline()
236 			int len = cmd - (u8 *) urb->transfer_buffer;  in udl_render_hline()
242 				return -EAGAIN;  in udl_render_hline()
244 			cmd = urb->transfer_buffer;  in udl_render_hline()
245 			cmd_end = &cmd[urb->transfer_buffer_length];  in udl_render_hline()