linux-dev/drivers/gpu/drm/msm/dsi, branch master

drm/msm/dsi: fix memory corruption with too many bridges

2022-09-30T16:57:53Z

Add the missing sanity check on the bridge counter to avoid corrupting data beyond the fixed-sized bridge array in case there are ever more than eight bridges. Fixes: a689554ba6ed ("drm/msm: Initial add DSI connector support") Cc: stable@vger.kernel.org # 4.1 Signed-off-by: Johan Hovold Tested-by: Kuogee Hsieh Reviewed-by: Kuogee Hsieh Reviewed-by: Dmitry Baryshkov Patchwork: https://patchwork.freedesktop.org/patch/502668/ Link: https://lore.kernel.org/r/20220913085320.8577-4-johan+linaro@kernel.org Signed-off-by: Abhinav Kumar

drm/msm/dsi: Remove use of device_node in dsi_host_parse_dt()

2022-09-18T16:38:06Z

Clang warns: drivers/gpu/drm/msm/dsi/dsi_host.c:1903:14: error: variable 'device_node' is uninitialized when used here [-Werror,-Wuninitialized] of_node_put(device_node); ^~~~~~~~~~~ drivers/gpu/drm/msm/dsi/dsi_host.c:1870:44: note: initialize the variable 'device_node' to silence this warning struct device_node *endpoint, *device_node; ^ = NULL 1 error generated. device_node's assignment was removed but not all of its uses. Remove the call to of_node_put() and the variable declaration to clean up the warning. Fixes: 36246dd50225 ("drm/msm/dsi: switch to DRM_PANEL_BRIDGE") Link: https://github.com/ClangBuiltLinux/linux/issues/1700 Signed-off-by: Nathan Chancellor Reviewed-by: Abhinav Kumar Reviewed-by: Dmitry Baryshkov Patchwork: https://patchwork.freedesktop.org/patch/500182/ Link: https://lore.kernel.org/r/20220829165450.217628-1-nathan@kernel.org Signed-off-by: Dmitry Baryshkov Signed-off-by: Rob Clark

drm/msm/dsi: switch to DRM_PANEL_BRIDGE

2022-09-18T16:38:06Z

Currently the DSI driver has two separate paths: one if the next device in a chain is a bridge and another one if the panel is connected directly to the DSI host. Simplify the code path by using panel-bridge driver (already selected in Kconfig) and dropping support for handling the panel directly. Signed-off-by: Dmitry Baryshkov Reviewed-by: Abhinav Kumar Patchwork: https://patchwork.freedesktop.org/patch/493608/ Link: https://lore.kernel.org/r/20220712132258.671263-1-dmitry.baryshkov@linaro.org Signed-off-by: Dmitry Baryshkov Signed-off-by: Rob Clark

drm/msm/dsi: fetch DSC pps payload from struct mipi_dsi_device

2022-09-18T16:38:06Z

Now that struct mipi_dsi_device provides DSC data, fetch it from the mentioned struct rather than from the struct drm_panel itself. This would allow supporting MIPI DSI bridges handling DSC on their input side. Signed-off-by: Dmitry Baryshkov Reviewed-by: Abhinav Kumar Patchwork: https://patchwork.freedesktop.org/patch/493307/ Link: https://lore.kernel.org/r/20220711094320.368062-3-dmitry.baryshkov@linaro.org Signed-off-by: Dmitry Baryshkov Signed-off-by: Rob Clark

drm/msm/dsi: Remove the unneeded result variable

2022-09-18T16:38:06Z

Return the value msm_dsi_phy_enable() directly instead of storing it in another redundant variable. Reported-by: Zeal Robot Signed-off-by: ye xingchen Reviewed-by: Dmitry Baryshkov Patchwork: https://patchwork.freedesktop.org/patch/499621/ Link: https://lore.kernel.org/r/20220826072821.253150-1-ye.xingchen@zte.com.cn Signed-off-by: Dmitry Baryshkov Signed-off-by: Rob Clark

drm/msm/dsi: drop the hpd worker

2022-09-18T16:38:06Z

It makes no sense to have the HPD worker in the MSM DSI driver anymore. It is only queued from the dsi_host_attach/detach() callbacks, where it plays no useful role. Either way the panel or next bridge will be present and will report it's status directly. Signed-off-by: Dmitry Baryshkov Reviewed-by: Abhinav Kumar Patchwork: https://patchwork.freedesktop.org/patch/498740/ Link: https://lore.kernel.org/r/20220822174417.292926-1-dmitry.baryshkov@linaro.org Signed-off-by: Dmitry Baryshkov Signed-off-by: Rob Clark

drm/msm/dsi: Improve dsi_phy_driver_probe() probe error handling

2022-09-18T16:38:06Z

The dsi_phy_driver_probe() function has a "goto fail" for no reason. Change it to just always return directly when it sees an error. Make this simpler by leveraging dev_err_probe() which is designed to make code like this shorter / simpler. NOTE: as part of this, we now pass through error codes directly from msm_ioremap_size() rather than translating to -ENOMEM. This changed mostly because it's much more convenient when using dev_err_probe() and also it's usually encouraged not to hide error codes like the old code was doing unless there is a good reason. I can't see any reason why we'd need to return -ENOMEM instead of -EINVAL from the probe function. Signed-off-by: Douglas Anderson Reviewed-by: Dmitry Baryshkov Reviewed-by: Abhinav Kumar Patchwork: https://patchwork.freedesktop.org/patch/496324/ Link: https://lore.kernel.org/r/20220804073608.v4.6.I969118a35934a0e5007fe4f80e3e28e9c0b7602a@changeid Signed-off-by: Dmitry Baryshkov Signed-off-by: Rob Clark

drm/msm/dsi: Take advantage of devm_regulator_bulk_get_const()

2022-09-18T16:38:06Z

As of the commit 1de452a0edda ("regulator: core: Allow drivers to define their init data as const") we no longer need to do copying of regulator bulk data from initdata to something dynamic. Let's take advantage of that. In addition to saving some code, this also moves us to using ARRAY_SIZE() to specify how many regulators we have which is less error prone. This gets rid of some layers of wrappers which makes it obvious that we can get rid of an extra error print. devm_regulator_bulk_get_const() prints errors for you so you don't need an extra layer of printing. In all cases here I have preserved the old settings without any investigation about whether the loads being set are sensible. In the cases of some of the PHYs if several PHYs in the same file used exactly the same settings I had them point to the same data structure. NOTE: Though I haven't done the math, this is likely an overall savings in terms of "static const" data. We previously always allocated space for 8 supplies. Each of these supplies took up 36 bytes of data (32 for name, 4 for an int). Signed-off-by: Douglas Anderson Reviewed-by: Dmitry Baryshkov Reviewed-by: Abhinav Kumar Patchwork: https://patchwork.freedesktop.org/patch/496325/ Link: https://lore.kernel.org/r/20220804073608.v4.5.I55a9e65cb1c22221316629e98768ff473f47a067@changeid Signed-off-by: Dmitry Baryshkov Signed-off-by: Rob Clark

drm/msm/dsi: Use the new regulator bulk feature to specify the load

2022-09-18T16:38:05Z

As of commit 6eabfc018e8d ("regulator: core: Allow specifying an initial load w/ the bulk API") we can now specify the initial load in the bulk data rather than having to manually call regulator_set_load() on each regulator. Let's use it. Signed-off-by: Douglas Anderson Reviewed-by: Dmitry Baryshkov Reviewed-by: Abhinav Kumar Patchwork: https://patchwork.freedesktop.org/patch/496319/ Link: https://lore.kernel.org/r/20220804073608.v4.4.I7b3c72949883846badb073cfeae985c55239da1d@changeid Signed-off-by: Dmitry Baryshkov Signed-off-by: Rob Clark

drm/msm/dsi: Don't set a load before disabling a regulator

2022-09-18T16:38:05Z

As of commit 5451781dadf8 ("regulator: core: Only count load for enabled consumers"), a load isn't counted for a disabled regulator. That means all the code in the DSI driver to specify and set loads before disabling a regulator is not actually doing anything useful. Let's remove it. It should be noted that all of the loads set that were being specified were pointless noise anyway. The only use for this number is to pick between low power and high power modes of regulators. Regulators appear to do this changeover at loads on the order of 10000 uA. You would need a lot of clients of the same rail for that 100 uA number to count for anything. Note that now that we get rid of the setting of the load at disable time, we can just set the load once when we first get the regulator and then forget it. It should also be noted that the regulator functions regulator_bulk_enable() and regulator_set_load() already print error messages when they encounter problems so while moving things around we get rid of some extra error prints. Signed-off-by: Douglas Anderson Reviewed-by: Dmitry Baryshkov Reviewed-by: Abhinav Kumar Patchwork: https://patchwork.freedesktop.org/patch/496320/ Link: https://lore.kernel.org/r/20220804073608.v4.3.If1f94fbbdb7c1d0fb3961de61483a851ad1971a7@changeid Signed-off-by: Dmitry Baryshkov Signed-off-by: Rob Clark