kernel/drivers/gpu/drm/msm/dsi/dsi_host.c, branch linux-rolling-stable

drm/msm/dsi: fix pclk rate calculation for bonded dsi

2026-03-19T15:14:49Z

[ Upstream commit e4eb11b34d6c84f398d8f08d7cb4d6c38e739dd2 ] Recently, we round up new_hdisplay once at most, for bonded dsi, we may need twice, since they are independent links, we should round up each half separately. This also aligns with the hdisplay we program later in dsi_timing_setup() Example: full_hdisplay = 1904, dsc_bpp = 8, bpc = 8 new_full_hdisplay = DIV_ROUND_UP(1904 * 8, 8 * 3) = 635 if we use half display new_half_hdisplay = DIV_ROUND_UP(952 * 8, 8 * 3) = 318 new_full_display = 636 Fixes: 7c9e4a554d4a ("drm/msm/dsi: Reduce pclk rate for compression") Signed-off-by: Pengyu Luo Reviewed-by: Dmitry Baryshkov Patchwork: https://patchwork.freedesktop.org/patch/709716/ Link: https://lore.kernel.org/r/20260306163255.215456-1-mitltlatltl@gmail.com Signed-off-by: Dmitry Baryshkov Signed-off-by: Sasha Levin

drm/msm/dsi: fix hdisplay calculation when programming dsi registers

2026-03-19T15:14:48Z

[ Upstream commit ac47870fd795549f03d57e0879fc730c79119f4b ] Recently, the hdisplay calculation is working for 3:1 compressed ratio only. If we have a video panel with DSC BPP = 8, and BPC = 10, we still use the default bits_per_pclk = 24, then we get the wrong hdisplay. We can draw the conclusion by cross-comparing the calculation with the calculation in dsi_adjust_pclk_for_compression(). Since CMD mode does not use this, we can remove !(msm_host->mode_flags & MIPI_DSI_MODE_VIDEO) safely. Fixes: efcbd6f9cdeb ("drm/msm/dsi: Enable widebus for DSI") Signed-off-by: Pengyu Luo Reviewed-by: Dmitry Baryshkov Patchwork: https://patchwork.freedesktop.org/patch/704822/ Link: https://lore.kernel.org/r/20260214105145.105308-1-mitltlatltl@gmail.com Signed-off-by: Dmitry Baryshkov Signed-off-by: Sasha Levin

drm/msm: Use drm_gpuvm types more

2025-07-05T00:48:35Z

Most of the driver code doesn't need to reach in to msm specific fields, so just use the drm_gpuvm/drm_gpuva types directly. This should hopefully improve commonality with other drivers and make the code easier to understand. Signed-off-by: Rob Clark Signed-off-by: Rob Clark Tested-by: Antonino Maniscalco Reviewed-by: Antonino Maniscalco Patchwork: https://patchwork.freedesktop.org/patch/661483/

drm/msm: Rename msm_gem_address_space -> msm_gem_vm

2025-07-04T18:09:44Z

Re-aligning naming to better match drm_gpuvm terminology will make things less confusing at the end of the drm_gpuvm conversion. This is just rename churn, no functional change. Signed-off-by: Rob Clark Reviewed-by: Dmitry Baryshkov Signed-off-by: Rob Clark Tested-by: Antonino Maniscalco Reviewed-by: Antonino Maniscalco Patchwork: https://patchwork.freedesktop.org/patch/661466/

drm/msm/dsi: Add support for SM8750

2025-07-04T13:35:19Z

Add support for DSI on Qualcomm SM8750 SoC with notable difference: DSI PHY PLLs, the parents of pixel and byte clocks, cannot be used as parents before DSI PHY is configured, the PLLs are prepared and their initial rate is set. Therefore assigned-clock-parents are not working here and driver is responsible for reparenting clocks with proper procedure: see dsi_clk_init_6g_v2_9(). Reviewed-by: Dmitry Baryshkov Signed-off-by: Krzysztof Kozlowski Patchwork: https://patchwork.freedesktop.org/patch/659619/ Link: https://lore.kernel.org/r/20250618-b4-sm8750-display-v7-7-a591c609743d@linaro.org Signed-off-by: Dmitry Baryshkov

drm/msm/dsi: Add check for devm_kstrdup()

2025-02-26T10:15:49Z

Add check for the return value of devm_kstrdup() in dsi_host_parse_dt() to catch potential exception. Fixes: 958d8d99ccb3 ("drm/msm/dsi: parse vsync source from device tree") Cc: stable@vger.kernel.org Signed-off-by: Haoxiang Li Reviewed-by: Abhinav Kumar Patchwork: https://patchwork.freedesktop.org/patch/638297/ Link: https://lore.kernel.org/r/20250219040712.2598161-1-haoxiang_li2024@163.com Signed-off-by: Dmitry Baryshkov

drm/msm/dsi: Allow values of 10 and 12 for bits per component

2025-02-26T10:15:49Z

The DRM DSC helper has various bits_per_component values - not just 8. But the DSC 1.1 block supports only 8, 10, and 12. Extend the guard accordingly and add a comment noting this limitation. Signed-off-by: Eugene Lepshy Co-developed-by: Danila Tikhonov Signed-off-by: Danila Tikhonov Reviewed-by: Dmitry Baryshkov Patchwork: https://patchwork.freedesktop.org/patch/637831/ Link: https://lore.kernel.org/r/20250217222431.82522-4-danila@jiaxyga.com Signed-off-by: Dmitry Baryshkov

drm/msm/dsi: Use existing per-interface slice count in DSC timing

2025-02-26T10:15:48Z

When configuring the timing of DSI hosts (interfaces) in dsi_timing_setup() all values written to registers are taking bonded-mode into account by dividing the original mode width by 2 (half the data is sent over each of the two DSI hosts), but the full width instead of the interface width is passed as hdisplay parameter to dsi_update_dsc_timing(). Currently only msm_dsc_get_slices_per_intf() is called within dsi_update_dsc_timing() with the `hdisplay` argument which clearly documents that it wants the width of a single interface (which, again, in bonded DSI mode is half the total width of the mode) resulting in all subsequent values to be completely off. However, as soon as we start to pass the halved hdisplay into dsi_update_dsc_timing() we might as well discard msm_dsc_get_slices_per_intf() since the value it calculates is already available in dsc->slice_count which is per-interface by the current design of MSM DPU/DSI implementations and their use of the DRM DSC helpers. Fixes: 08802f515c3c ("drm/msm/dsi: Add support for DSC configuration") Reviewed-by: Dmitry Baryshkov Reviewed-by: Jessica Zhang Signed-off-by: Marijn Suijten Patchwork: https://patchwork.freedesktop.org/patch/637648/ Link: https://lore.kernel.org/r/20250217-drm-msm-initial-dualpipe-dsc-fixes-v3-1-913100d6103f@somainline.org Signed-off-by: Dmitry Baryshkov

drm/msm/dsi: Drop unnecessary -ENOMEM message

2025-02-26T10:15:48Z

Kernel core already prints detailed report about memory allocation failures, so drivers should not have their own error messages. Reviewed-by: Abhinav Kumar Signed-off-by: Krzysztof Kozlowski Reviewed-by: Dmitry Baryshkov Patchwork: https://patchwork.freedesktop.org/patch/637308/ Link: https://lore.kernel.org/r/20250214-drm-msm-cleanups-v2-4-1bec50f37dc1@linaro.org Signed-off-by: Dmitry Baryshkov

drm/msm/dsi: Minor whitespace and style cleanup

2025-02-26T10:15:48Z

Cleanup few obvious kernel coding style violations: missing or unnecessary braces in 'if-else', unnecessary break lines, incorrect breaking of long function declarations, unnecessary 'else' after a 'return'. No functional impact expected. Reviewed-by: Abhinav Kumar Signed-off-by: Krzysztof Kozlowski Reviewed-by: Dmitry Baryshkov Patchwork: https://patchwork.freedesktop.org/patch/637305/ Link: https://lore.kernel.org/r/20250214-drm-msm-cleanups-v2-3-1bec50f37dc1@linaro.org Signed-off-by: Dmitry Baryshkov