[PATCH v2 00/18] drm/bridge: cdns-dsi: Make it work a bit better

[Jayesh Choudhary]

Hello Tomi,

On 02/04/25 19:00, Tomi Valkeinen wrote:
> While trying to get the cdns-dsi to work on Toradex's AM69 Aquila
> platform, I hit multiple issues in the driver. Basicaly nothing worked
> for with the board.
> 
> This series fixes those issues. While I itch to make much larger changes
> to the cdns-dsi driver, I opted to keep this series relatively simple to
> make the fixes more clear and possibly help with backporting.
> 
> The series also touches tidss, but those changes are not strictly
> needed, and can be merged separately. And the series also touches
> cdns-dphy, and those changes are needed.
> 
> This has been tested on Toradex AM69 Aquila, with:
> - HDMI output using lontium lt8912b
> - LVDS panel (sn65dsi84 + panel-lvds)
> 
>   Tomi
> 

I have tested this series for TI SoCs J784S4 and J721S2 as well where
we use the following pipeline:
DSS -> CDNS_DSI -> SN65DSI86 -> DisplayConnector
(https://lore.kernel.org/all/20250411105155.303657-1-j-choudhary@ti.com/)


Tested-by: Jayesh Choudhary <j-choudhary at ti.com>


> Signed-off-by: Tomi Valkeinen <tomi.valkeinen at ideasonboard.com>
> ---
> Changes in v2:
> - Change the tidss clock adjustment from mode_fixup() to atomic_check()
> - Link to v1: https://lore.kernel.org/r/20250320-cdns-dsi-impro-v1-0-725277c5f43b@ideasonboard.com
> 
> ---
> Tomi Valkeinen (18):
>        drm/tidss: Fix missing includes and struct decls
>        drm/tidss: Use the crtc_* timings when programming the HW
>        drm/tidss: Adjust the pclk based on the HW capabilities
>        phy: cdns-dphy: Store hs_clk_rate and return it
>        phy: cdns-dphy: Remove leftover code
>        drm/bridge: cdns-dsi: Adjust mode to negative syncs
>        drm/bridge: cdns-dsi: Fail if HS rate changed when validating PHY config
>        drm/bridge: cdns-dsi: Clean up cdns_dsi_mode2cfg()
>        drm/bridge: cdns-dsi: Fix REG_WAKEUP_TIME value
>        drm/bridge: cdns-dsi: Fix event mode
>        drm/bridge: cdns-dsi: Remove broken fifo emptying check
>        drm/bridge: cdns-dsi: Drop checks that shouldn't be in .mode_valid()
>        drm/bridge: cdns-dsi: Do not use crtc_* values
>        drm/bridge: cdns-dsi: Use videomode internally
>        drm/bridge: cdns-dsi: Tune adjusted_mode->clock according to dsi needs
>        drm/bridge: cdns-dsi: Update htotal in cdns_dsi_mode2cfg()
>        drm/bridge: cdns-dsi: Drop cdns_dsi_adjust_phy_config()
>        drm/bridge: cdns-dsi: Don't fail on MIPI_DSI_MODE_VIDEO_BURST
> 
>   drivers/gpu/drm/bridge/cadence/cdns-dsi-core.c | 224 +++++++++++--------------
>   drivers/gpu/drm/tidss/tidss_crtc.c             |  25 ++-
>   drivers/gpu/drm/tidss/tidss_dispc.c            |  22 ++-
>   drivers/gpu/drm/tidss/tidss_dispc.h            |   5 +
>   drivers/gpu/drm/tidss/tidss_drv.h              |   2 +
>   drivers/gpu/drm/tidss/tidss_plane.h            |   2 +
>   drivers/gpu/drm/tidss/tidss_scale_coefs.h      |   2 +
>   drivers/phy/cadence/cdns-dphy.c                |  24 +--
>   8 files changed, 155 insertions(+), 151 deletions(-)
> ---
> base-commit: 10646ddac2917b31c985ceff0e4982c42a9c924b
> change-id: 20250320-cdns-dsi-impro-3d8fbd7848d1
> prerequisite-message-id: 20250226155228.564289-1-aradhya.bhatia at linux.dev
> prerequisite-patch-id: 46845a8d15042dd343a29a17fc0b9d0eec2605f5
> prerequisite-patch-id: 7ce82c26cb9e18884492d2282a72ff2a760aefda
> prerequisite-patch-id: ec2071425cab81da72e0805ad92fc52731d7a24d
> prerequisite-patch-id: 32cde02288e0c36ed687f67778937a61f78b2d90
> prerequisite-patch-id: 5f302e2bead8994763699a909ad0b5501f09ed9f
> prerequisite-patch-id: 30611df6ef38c7872107d6bf6dde4504d46ab224
> prerequisite-patch-id: 99831bcaa13e25b957d83a6320f34bcec223b939
> prerequisite-patch-id: b0ad38bc6b323ceea7a1d2266b0fab8deaa6b05e
> prerequisite-patch-id: 38dbce2b9302a764be9dbdc551578f02d797dfcc
> prerequisite-patch-id: 133f8b1dab4f47d429b1924df981564ce3736233
> prerequisite-patch-id: 879c546693a53e4b72c1ee25954c894ae57a441f
> prerequisite-patch-id: 3e7edc818ac078a138f0e42e3f47fd685fffb84f
> prerequisite-patch-id: 673b9f0b1936b5a49973b71cab5d13774583de38
> 
> Best regards,