target/linux/realtek/patches-5.10/309-cevt-rtl9300-support.patch

   1 From 775d903216a08c2a8009863d2f9c33f62657ba94 Mon Sep 17 00:00:00 2001
   2 From: Birger Koblitz <git@birger-koblitz.de>
   3 Date: Thu, 6 Jan 2022 20:27:01 +0100
   4 Subject: [PATCH] realtek: Replace the RTL9300 generic timer with a CEVT timer
   5
   6 The RTL9300 has a broken R4K MIPS timer interrupt, however, the
   7 R4K clocksource works. We replace the RTL9300 timer with a
   8 Clock Event Timer (CEVT), which is VSMP aware and can be instantiated
   9 as part of brining a VSMTP cpu up instead of the R4K CEVT source.
  10 For this we place the RTL9300 CEVT timer in arch/mips/kernel
  11 together with other MIPS CEVT timers, initialize the SoC IRQs
  12 from a modified smp-mt.c and instantiate each timer as part
  13 of the MIPS time setup in arch/mips/include/asm/time.h instead
  14 of the R4K CEVT, similarly as is done by other MIPS CEVT timers.
  15
  16 Submitted-by: Birger Koblitz <git@birger-koblitz.de>
  17 ---
  18  arch/mips/kernel/Makefile                     | 1 +
  19  arch/mips/include/asm/time.h                  | 7 +++++++
  20  2 files changed, 8 insertions(+)
  21
  22 --- a/arch/mips/kernel/Makefile
  23 +++ b/arch/mips/kernel/Makefile
  24 @@ -27,6 +27,7 @@ obj-$(CONFIG_CEVT_BCM1480)    += cevt-bcm14
  25  obj-$(CONFIG_CEVT_R4K)         += cevt-r4k.o
  26  obj-$(CONFIG_CEVT_DS1287)      += cevt-ds1287.o
  27  obj-$(CONFIG_CEVT_GT641XX)     += cevt-gt641xx.o
  28 +obj-$(CONFIG_CEVT_RTL9300)     += cevt-rtl9300.o
  29  obj-$(CONFIG_CEVT_SB1250)      += cevt-sb1250.o
  30  obj-$(CONFIG_CEVT_TXX9)                += cevt-txx9.o
  31  obj-$(CONFIG_CSRC_BCM1480)     += csrc-bcm1480.o
  32 --- a/arch/mips/include/asm/time.h
  33 +++ b/arch/mips/include/asm/time.h
  34 @@ -15,6 +15,8 @@
  35  #include <linux/clockchips.h>
  36  #include <linux/clocksource.h>
  37
  38 +extern void rtl9300_clockevent_init(void);
  39 +
  40  extern spinlock_t rtc_lock;
  41
  42  /*
  43 @@ -43,6 +45,11 @@ extern int r4k_clockevent_init(void);
  44
  45  static inline int mips_clockevent_init(void)
  46  {
  47 +#ifdef CONFIG_CEVT_RTL9300
  48 +       rtl9300_clockevent_init();
  49 +       return 0;
  50 +#endif
  51 +
  52  #ifdef CONFIG_CEVT_R4K
  53         return r4k_clockevent_init();
  54  #else