ARM: OMAP2+: hwmod: Fix a crash in _setup_reset() with DEBUG_LL

With commit '82702ea11ddfe0e43382e1fa5b66d807d8114916' "ARM: OMAP2+:
Fix serial init for device tree based booting" stubbing out
omap_serial_early_init() for Device tree based booting, there was a
crash observed on AM335x based devices when hwmod does a
_setup_reset() early at boot.

This was rootcaused to hwmod trying to reset console uart while
earlycon was using it.  The way to tell hwmod not to do this is to
specify the HWMOD_INIT_NO_RESET flag, which were infact set by the
omap_serial_early_init() function by parsing the cmdline to identify
the console device.

Parsing the cmdline to identify the uart used by earlycon itself seems
broken as there is nothing preventing earlycon to use a different one.

This patch, instead, attempts to populate the requiste flags for hwmod
based on the CONFIG_DEBUG_OMAPxUARTy FLAGS. This gets rid of the need
for cmdline parsing in the DT as well as non-DT cases to identify the
uart used by earlycon.

Signed-off-by: Rajendra Nayak <rnayak@ti.com>
Reported-by: Mark Jackson <mpfj-list@newflow.co.uk>
Reported-by: Vaibhav Bedia <vaibhav.bedia@ti.com>
Tested-by: Mark Jackson <mpfj-list@newflow.co.uk>
Signed-off-by: Paul Walmsley <paul@pwsan.com>

diff --git a/arch/arm/mach-omap2/omap_hwmod.h b/arch/arm/mach-omap2/omap_hwmod.h
index aab33fd814c0329e178cbfe265fdf9ff5ffb766c..8440a21fc60a5237d11dc5056c1d40e10a84e8b6 100644 (file)
--- a/arch/arm/mach-omap2/omap_hwmod.h
+++ b/arch/arm/mach-omap2/omap_hwmod.h
@@ -95,6 +95,54 @@ extern struct omap_hwmod_sysc_fields omap_hwmod_sysc_type3;
 #define MODULEMODE_HWCTRL              1
 #define MODULEMODE_SWCTRL              2
 
+#define DEBUG_OMAP2UART1_FLAGS 0
+#define DEBUG_OMAP2UART2_FLAGS 0
+#define DEBUG_OMAP2UART3_FLAGS 0
+#define DEBUG_OMAP3UART3_FLAGS 0
+#define DEBUG_OMAP3UART4_FLAGS 0
+#define DEBUG_OMAP4UART3_FLAGS 0
+#define DEBUG_OMAP4UART4_FLAGS 0
+#define DEBUG_TI81XXUART1_FLAGS        0
+#define DEBUG_TI81XXUART2_FLAGS        0
+#define DEBUG_TI81XXUART3_FLAGS        0
+#define DEBUG_AM33XXUART1_FLAGS        0
+
+#define DEBUG_OMAPUART_FLAGS   (HWMOD_INIT_NO_IDLE | HWMOD_INIT_NO_RESET)
+
+#if defined(CONFIG_DEBUG_OMAP2UART1)
+#undef DEBUG_OMAP2UART1_FLAGS
+#define DEBUG_OMAP2UART1_FLAGS DEBUG_OMAPUART_FLAGS
+#elif defined(CONFIG_DEBUG_OMAP2UART2)
+#undef DEBUG_OMAP2UART2_FLAGS
+#define DEBUG_OMAP2UART2_FLAGS DEBUG_OMAPUART_FLAGS
+#elif defined(CONFIG_DEBUG_OMAP2UART3)
+#undef DEBUG_OMAP2UART3_FLAGS
+#define DEBUG_OMAP2UART3_FLAGS DEBUG_OMAPUART_FLAGS
+#elif defined(CONFIG_DEBUG_OMAP3UART3)
+#undef DEBUG_OMAP3UART3_FLAGS
+#define DEBUG_OMAP3UART3_FLAGS DEBUG_OMAPUART_FLAGS
+#elif defined(CONFIG_DEBUG_OMAP3UART4)
+#undef DEBUG_OMAP3UART4_FLAGS
+#define DEBUG_OMAP3UART4_FLAGS DEBUG_OMAPUART_FLAGS
+#elif defined(CONFIG_DEBUG_OMAP4UART3)
+#undef DEBUG_OMAP4UART3_FLAGS
+#define DEBUG_OMAP4UART3_FLAGS DEBUG_OMAPUART_FLAGS
+#elif defined(CONFIG_DEBUG_OMAP4UART4)
+#undef DEBUG_OMAP4UART4_FLAGS
+#define DEBUG_OMAP4UART4_FLAGS DEBUG_OMAPUART_FLAGS
+#elif defined(CONFIG_DEBUG_TI81XXUART1)
+#undef DEBUG_TI81XXUART1_FLAGS
+#define DEBUG_TI81XXUART1_FLAGS DEBUG_OMAPUART_FLAGS
+#elif defined(CONFIG_DEBUG_TI81XXUART2)
+#undef DEBUG_TI81XXUART2_FLAGS
+#define DEBUG_TI81XXUART2_FLAGS DEBUG_OMAPUART_FLAGS
+#elif defined(CONFIG_DEBUG_TI81XXUART3)
+#undef DEBUG_TI81XXUART3_FLAGS
+#define DEBUG_TI81XXUART3_FLAGS DEBUG_OMAPUART_FLAGS
+#elif defined(CONFIG_DEBUG_AM33XXUART1)
+#undef DEBUG_AM33XXUART1_FLAGS
+#define DEBUG_AM33XXUART1_FLAGS DEBUG_OMAPUART_FLAGS
+#endif
 
 /**
  * struct omap_hwmod_mux_info - hwmod specific mux configuration

diff --git a/arch/arm/mach-omap2/omap_hwmod_2xxx_ipblock_data.c b/arch/arm/mach-omap2/omap_hwmod_2xxx_ipblock_data.c
index d05fc7b54567f0dbb6597a1d641ce130caf7ee9b..56cebb05509e15c0054f342e158a21214b7a6603 100644 (file)
--- a/arch/arm/mach-omap2/omap_hwmod_2xxx_ipblock_data.c
+++ b/arch/arm/mach-omap2/omap_hwmod_2xxx_ipblock_data.c
@@ -512,7 +512,7 @@ struct omap_hwmod omap2xxx_uart1_hwmod = {
        .mpu_irqs       = omap2_uart1_mpu_irqs,
        .sdma_reqs      = omap2_uart1_sdma_reqs,
        .main_clk       = "uart1_fck",
-       .flags          = HWMOD_SWSUP_SIDLE_ACT,
+       .flags          = DEBUG_OMAP2UART1_FLAGS | HWMOD_SWSUP_SIDLE_ACT,
        .prcm           = {
                .omap2 = {
                        .module_offs = CORE_MOD,
@@ -532,7 +532,7 @@ struct omap_hwmod omap2xxx_uart2_hwmod = {
        .mpu_irqs       = omap2_uart2_mpu_irqs,
        .sdma_reqs      = omap2_uart2_sdma_reqs,
        .main_clk       = "uart2_fck",
-       .flags          = HWMOD_SWSUP_SIDLE_ACT,
+       .flags          = DEBUG_OMAP2UART2_FLAGS | HWMOD_SWSUP_SIDLE_ACT,
        .prcm           = {
                .omap2 = {
                        .module_offs = CORE_MOD,
@@ -552,7 +552,7 @@ struct omap_hwmod omap2xxx_uart3_hwmod = {
        .mpu_irqs       = omap2_uart3_mpu_irqs,
        .sdma_reqs      = omap2_uart3_sdma_reqs,
        .main_clk       = "uart3_fck",
-       .flags          = HWMOD_SWSUP_SIDLE_ACT,
+       .flags          = DEBUG_OMAP2UART3_FLAGS | HWMOD_SWSUP_SIDLE_ACT,
        .prcm           = {
                .omap2 = {
                        .module_offs = CORE_MOD,

diff --git a/arch/arm/mach-omap2/omap_hwmod_33xx_data.c b/arch/arm/mach-omap2/omap_hwmod_33xx_data.c
index 28bbd56346a93ab67fc377eb1ea066a8be8280f7..d4114a919df783152bc8d91fb4c39b5e1e426159 100644 (file)
--- a/arch/arm/mach-omap2/omap_hwmod_33xx_data.c
+++ b/arch/arm/mach-omap2/omap_hwmod_33xx_data.c
@@ -1512,7 +1512,7 @@ static struct omap_hwmod am33xx_uart1_hwmod = {
        .name           = "uart1",
        .class          = &uart_class,
        .clkdm_name     = "l4_wkup_clkdm",
-       .flags          = HWMOD_SWSUP_SIDLE_ACT,
+       .flags          = DEBUG_AM33XXUART1_FLAGS | HWMOD_SWSUP_SIDLE_ACT,
        .main_clk       = "dpll_per_m2_div4_wkupdm_ck",
        .prcm           = {
                .omap4  = {

diff --git a/arch/arm/mach-omap2/omap_hwmod_3xxx_data.c b/arch/arm/mach-omap2/omap_hwmod_3xxx_data.c
index f7a3df2fb579613a761f9a484dbb0254cadcda9c..0c3a427da5445a5d2f990e05f2f3fcec50634143 100644 (file)
--- a/arch/arm/mach-omap2/omap_hwmod_3xxx_data.c
+++ b/arch/arm/mach-omap2/omap_hwmod_3xxx_data.c
@@ -490,7 +490,7 @@ static struct omap_hwmod omap3xxx_uart1_hwmod = {
        .mpu_irqs       = omap2_uart1_mpu_irqs,
        .sdma_reqs      = omap2_uart1_sdma_reqs,
        .main_clk       = "uart1_fck",
-       .flags          = HWMOD_SWSUP_SIDLE_ACT,
+       .flags          = DEBUG_TI81XXUART1_FLAGS | HWMOD_SWSUP_SIDLE_ACT,
        .prcm           = {
                .omap2 = {
                        .module_offs = CORE_MOD,
@@ -509,7 +509,7 @@ static struct omap_hwmod omap3xxx_uart2_hwmod = {
        .mpu_irqs       = omap2_uart2_mpu_irqs,
        .sdma_reqs      = omap2_uart2_sdma_reqs,
        .main_clk       = "uart2_fck",
-       .flags          = HWMOD_SWSUP_SIDLE_ACT,
+       .flags          = DEBUG_TI81XXUART2_FLAGS | HWMOD_SWSUP_SIDLE_ACT,
        .prcm           = {
                .omap2 = {
                        .module_offs = CORE_MOD,
@@ -528,7 +528,8 @@ static struct omap_hwmod omap3xxx_uart3_hwmod = {
        .mpu_irqs       = omap2_uart3_mpu_irqs,
        .sdma_reqs      = omap2_uart3_sdma_reqs,
        .main_clk       = "uart3_fck",
-       .flags          = HWMOD_SWSUP_SIDLE_ACT,
+       .flags          = DEBUG_OMAP3UART3_FLAGS | DEBUG_TI81XXUART3_FLAGS |
+                               HWMOD_SWSUP_SIDLE_ACT,
        .prcm           = {
                .omap2 = {
                        .module_offs = OMAP3430_PER_MOD,
@@ -558,7 +559,7 @@ static struct omap_hwmod omap36xx_uart4_hwmod = {
        .mpu_irqs       = uart4_mpu_irqs,
        .sdma_reqs      = uart4_sdma_reqs,
        .main_clk       = "uart4_fck",
-       .flags          = HWMOD_SWSUP_SIDLE_ACT,
+       .flags          = DEBUG_OMAP3UART4_FLAGS | HWMOD_SWSUP_SIDLE_ACT,
        .prcm           = {
                .omap2 = {
                        .module_offs = OMAP3430_PER_MOD,

diff --git a/arch/arm/mach-omap2/omap_hwmod_44xx_data.c b/arch/arm/mach-omap2/omap_hwmod_44xx_data.c
index d04b5e60fdbec74c6accf27c349a79f07a8c01fb..9c3b504477d7b341b4492ec350bb3404769fa219 100644 (file)
--- a/arch/arm/mach-omap2/omap_hwmod_44xx_data.c
+++ b/arch/arm/mach-omap2/omap_hwmod_44xx_data.c
@@ -2858,8 +2858,7 @@ static struct omap_hwmod omap44xx_uart3_hwmod = {
        .name           = "uart3",
        .class          = &omap44xx_uart_hwmod_class,
        .clkdm_name     = "l4_per_clkdm",
-       .flags          = HWMOD_INIT_NO_IDLE | HWMOD_INIT_NO_RESET |
-                               HWMOD_SWSUP_SIDLE_ACT,
+       .flags          = DEBUG_OMAP4UART3_FLAGS | HWMOD_SWSUP_SIDLE_ACT,
        .main_clk       = "func_48m_fclk",
        .prcm = {
                .omap4 = {
@@ -2875,7 +2874,7 @@ static struct omap_hwmod omap44xx_uart4_hwmod = {
        .name           = "uart4",
        .class          = &omap44xx_uart_hwmod_class,
        .clkdm_name     = "l4_per_clkdm",
-       .flags          = HWMOD_SWSUP_SIDLE_ACT,
+       .flags          = DEBUG_OMAP4UART4_FLAGS | HWMOD_SWSUP_SIDLE_ACT,
        .main_clk       = "func_48m_fclk",
        .prcm = {
                .omap4 = {

diff --git a/arch/arm/mach-omap2/omap_hwmod_54xx_data.c b/arch/arm/mach-omap2/omap_hwmod_54xx_data.c
index f37ae96b70a1a9e2c67085b2a0a466992358a4e6..3c70f5c1860fc2b96401fe6ad1256c1a975539e0 100644 (file)
--- a/arch/arm/mach-omap2/omap_hwmod_54xx_data.c
+++ b/arch/arm/mach-omap2/omap_hwmod_54xx_data.c
@@ -1375,7 +1375,7 @@ static struct omap_hwmod omap54xx_uart3_hwmod = {
        .name           = "uart3",
        .class          = &omap54xx_uart_hwmod_class,
        .clkdm_name     = "l4per_clkdm",
-       .flags          = HWMOD_INIT_NO_IDLE | HWMOD_INIT_NO_RESET,
+       .flags          = DEBUG_OMAP4UART3_FLAGS,
        .main_clk       = "func_48m_fclk",
        .prcm = {
                .omap4 = {
@@ -1391,6 +1391,7 @@ static struct omap_hwmod omap54xx_uart4_hwmod = {
        .name           = "uart4",
        .class          = &omap54xx_uart_hwmod_class,
        .clkdm_name     = "l4per_clkdm",
+       .flags          = DEBUG_OMAP4UART4_FLAGS,
        .main_clk       = "func_48m_fclk",
        .prcm = {
                .omap4 = {

diff --git a/arch/arm/mach-omap2/serial.c b/arch/arm/mach-omap2/serial.c
index 3a674de6cb632d21dade993c9e0cb3ca2c7babd8..a388f8c1bcb3cb2c69a199613ee3710eeb333c7b 100644 (file)
--- a/arch/arm/mach-omap2/serial.c
+++ b/arch/arm/mach-omap2/serial.c
@@ -208,17 +208,6 @@ static int __init omap_serial_early_init(void)
                                pr_info("%s used as console in debug mode: uart%d clocks will not be gated",
                                        uart_name, uart->num);
                        }
-
-                       /*
-                        * omap-uart can be used for earlyprintk logs
-                        * So if omap-uart is used as console then prevent
-                        * uart reset and idle to get logs from omap-uart
-                        * until uart console driver is available to take
-                        * care for console messages.
-                        * Idling or resetting omap-uart while printing logs
-                        * early boot logs can stall the boot-up.
-                        */
-                       oh->flags |= HWMOD_INIT_NO_IDLE | HWMOD_INIT_NO_RESET;
                }
        } while (1);