On 2/2/22 15:25, Drew Fustini wrote:
> The existing fix for errata i940 causes a conflict for IPU2 which is
> using timer 3 and 4. From arch/arm/boot/dts/dra7-ipu-dsp-common.dtsi:
>
> &ipu2 {
> mboxes = <&mailbox6 &mbox_ipu2_ipc3x>;
> ti,timers = <&timer3>;
> ti,watchdog-timers = <&timer4>, <&timer9>;
> };
>
> I discovered the timer conflict from when booting mainline on a
> BeagleBoard X15 (AM5728):
>
> remoteproc remoteproc1: 55020000.ipu is available
> remoteproc remoteproc1: powering up 55020000.ipu
> remoteproc remoteproc1: Booting fw image dra7-ipu2-fw.xem4
> omap-rproc 55020000.ipu: could not get timer platform device
> omap-rproc 55020000.ipu: omap_rproc_enable_timers failed: -19
> remoteproc remoteproc1: can't start rproc 55020000.ipu: -19
>
> I modified the errata fix to use timer 15 and 16 instead which resolves
> the timer conflict.
>
> Fixes: 25de4ce5ed02 ("clocksource/drivers/timer-ti-dm: Handle dra7 timer wrap errata i940")
> Link: https://lore.kernel.org/linux-omap/YfWsG0p6to3IJuvE@x1/
Suggested-by: Suman Anna <s-anna@xxxxxx>
regards
Suman
> Signed-off-by: Drew Fustini <dfustini@xxxxxxxxxxxx>
> ---
> Note: I am keeping the device tree and driver change together in one
> patch as that is how the original errata fix commit was structured.
>
> arch/arm/boot/dts/dra7-l4.dtsi | 5 ++---
> arch/arm/boot/dts/dra7.dtsi | 8 ++++----
> drivers/clocksource/timer-ti-dm-systimer.c | 4 ++--
> 3 files changed, 8 insertions(+), 9 deletions(-)
>
> diff --git a/arch/arm/boot/dts/dra7-l4.dtsi b/arch/arm/boot/dts/dra7-l4.dtsi
> index 956a26d52a4c..0a11bacffc1f 100644
> --- a/arch/arm/boot/dts/dra7-l4.dtsi
> +++ b/arch/arm/boot/dts/dra7-l4.dtsi
> @@ -3482,8 +3482,7 @@ timer14: timer@0 {
> ti,timer-pwm;
> };
> };
> -
> - target-module@2c000 { /* 0x4882c000, ap 17 02.0 */
> + timer15_target: target-module@2c000 { /* 0x4882c000, ap 17 02.0 */
> compatible = "ti,sysc-omap4-timer", "ti,sysc";
> reg = <0x2c000 0x4>,
> <0x2c010 0x4>;
> @@ -3511,7 +3510,7 @@ timer15: timer@0 {
> };
> };
>
> - target-module@2e000 { /* 0x4882e000, ap 19 14.0 */
> + timer16_target: target-module@2e000 { /* 0x4882e000, ap 19 14.0 */
> compatible = "ti,sysc-omap4-timer", "ti,sysc";
> reg = <0x2e000 0x4>,
> <0x2e010 0x4>;
> diff --git a/arch/arm/boot/dts/dra7.dtsi b/arch/arm/boot/dts/dra7.dtsi
> index 6b485cbed8d5..8f7ffe2f66e9 100644
> --- a/arch/arm/boot/dts/dra7.dtsi
> +++ b/arch/arm/boot/dts/dra7.dtsi
> @@ -1339,20 +1339,20 @@ timer@0 {
> };
>
> /* Local timers, see ARM architected timer wrap erratum i940 */
> -&timer3_target {
> +&timer15_target {
> ti,no-reset-on-init;
> ti,no-idle;
> timer@0 {
> - assigned-clocks = <&l4per_clkctrl DRA7_L4PER_TIMER3_CLKCTRL 24>;
> + assigned-clocks = <&l4per3_clkctrl DRA7_L4PER3_TIMER15_CLKCTRL 24>;
> assigned-clock-parents = <&timer_sys_clk_div>;
> };
> };
>
> -&timer4_target {
> +&timer16_target {
> ti,no-reset-on-init;
> ti,no-idle;
> timer@0 {
> - assigned-clocks = <&l4per_clkctrl DRA7_L4PER_TIMER4_CLKCTRL 24>;
> + assigned-clocks = <&l4per3_clkctrl DRA7_L4PER3_TIMER16_CLKCTRL 24>;
> assigned-clock-parents = <&timer_sys_clk_div>;
> };
> };
> diff --git a/drivers/clocksource/timer-ti-dm-systimer.c b/drivers/clocksource/timer-ti-dm-systimer.c
> index b6f97960d8ee..c706d63e9f5c 100644
> --- a/drivers/clocksource/timer-ti-dm-systimer.c
> +++ b/drivers/clocksource/timer-ti-dm-systimer.c
> @@ -695,9 +695,9 @@ static int __init dmtimer_percpu_quirk_init(struct device_node *np, u32 pa)
> return 0;
> }
>
> - if (pa == 0x48034000) /* dra7 dmtimer3 */
> + if (pa == 0x4882C000) /* dra7 dmtimer15 */
> return dmtimer_percpu_timer_init(np, 0);
> - else if (pa == 0x48036000) /* dra7 dmtimer4 */
> + else if (pa == 0x4882E000) /* dra7 dmtimer16 */
> return dmtimer_percpu_timer_init(np, 1);
>
> return 0;
