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When only lines 10-20 are dirty, line 10's pixel data is written to the slot with address 1 instead of address 11, corrupting the address- to-data mapping. Fix sharp_memory_set_tx_buffer_addresses() to iterate over only the damaged line count and offset assigned addresses by the clip start, so that addresses match the pixel data that follows. Fixes: b8f9f21716fec ("drm/tiny: Add driver for Sharp Memory LCD") Signed-off-by: Tobias Johansson --- drivers/gpu/drm/tiny/sharp-memory.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/gpu/drm/tiny/sharp-memory.c b/drivers/gpu/drm/tiny/sharp-memory.c index cbf69460ebf3..595926ed660e 100644 --- a/drivers/gpu/drm/tiny/sharp-memory.c +++ b/drivers/gpu/drm/tiny/sharp-memory.c @@ -120,8 +120,8 @@ static inline void sharp_memory_set_tx_buffer_addresses(u8 *buffer, struct drm_rect clip, u32 pitch) { - for (u32 line = 0; line < clip.y2; ++line) - buffer[line * pitch] = line + 1; + for (u32 line = 0; line < drm_rect_height(&clip); ++line) + buffer[line * pitch] = clip.y1 + line + 1; } static void sharp_memory_set_tx_buffer_data(u8 *buffer, -- 2.43.0