On 2015년 06월 12일 21:10, Inki Dae wrote:
> On 2015년 06월 12일 18:07, Marek Szyprowski wrote:
>> One should not do any assumptions on the stare of the fimd hardware
>> during driver initialization, so to properly reset fimd before enabling
>> IOMMU, one should ensure that all power domains and clocks are really
>> enabled. This patch adds pm_runtime and clocks management in the
>> fimd_clear_channel() function to ensure that any access to fimd
>> registers will be performed with clocks and power domains enabled.
>>
>> Signed-off-by: Marek Szyprowski <m.szyprowski@xxxxxxxxxxx>
>> Tested-by: Javier Martinez Canillas <javier.martinez@xxxxxxxxxxxxxxx>
>> ---
>> Changelog:
>> v3 (alternative):
>> - araranged code by moving fimd_{enable,disable}_vblank functions before
>> fimd_clear_channel to avoid forward declaration usage
>
> Marek,
>
> For the iommu and atomic feature test, I merged below patches in
> addition and tested them.
>
> [PATCH v2 1/3] drm/exynos: remove to call mixer_wait_for_vblank
> [PATCH v2 2/3] drm/exynos: remove chained calls to enable
> [PATCH v2 3/3] drm/exynos: initialize VIDCON0 when fimd is disabled
>
>
> However, I see below one warning log,
>
> [ 1.227115] [drm] Initialized drm 1.1.0 20060810
> [ 1.235852] exynos-drm exynos-drm: bound exynos-drm-vidi (ops
> vidi_component_ops)
> [ 1.253548] ------------[ cut here ]------------
> [ 1.256700] WARNING: CPU: 0 PID: 0 at drivers/gpu/drm/drm_irq.c:1718
> drm_handle_vblank+0x2a0/0x308()
> [ 1.265800] Modules linked in:
> [ 1.268844] CPU: 0 PID: 0 Comm: swapper/0 Not tainted
> 4.1.0-rc4-00574-gf8eb363-dirty #1412
> [ 1.277085] Hardware name: SAMSUNG EXYNOS (Flattened Device Tree)
> [ 1.283184] [<c0015464>] (unwind_backtrace) from [<c00123c0>]
> (show_stack+0x10/0x14)
> [ 1.288540] exynos-drm exynos-drm: bound 11c00000.fimd (ops
> fimd_component_ops)
> [ 1.288883] exynos-drm exynos-drm: bound 11c80000.dsi (ops
> exynos_dsi_component_ops)
> [ 1.288888] [drm] Supports vblank timestamp caching Rev 2 (21.10.2013).
> [ 1.288891] [drm] No driver support for vblank timestamp query.
> [ 1.288932] [drm] Initialized exynos 1.0.0 20110530 on minor 0
> [ 1.324248] [<c00123c0>] (show_stack) from [<c0528f74>]
> (dump_stack+0x84/0xc4)
> [ 1.331437] [<c0528f74>] (dump_stack) from [<c00246ac>]
> (warn_slowpath_common+0x80/0xb0)
> [ 1.339504] [<c00246ac>] (warn_slowpath_common) from [<c0024778>]
> (warn_slowpath_null+0x1c/0x24)
> [ 1.348270] [<c0024778>] (warn_slowpath_null) from [<c029c898>]
> (drm_handle_vblank+0x2a0/0x308)
> [ 1.356965] [<c029c898>] (drm_handle_vblank) from [<c02b8c80>]
> (fimd_irq_handler+0x78/0xd0)
> [ 1.365292] [<c02b8c80>] (fimd_irq_handler) from [<c00608f8>]
> (handle_irq_event_percpu+0x78/0x134)
> [ 1.374231] [<c00608f8>] (handle_irq_event_percpu) from [<c00609f0>]
> (handle_irq_event+0x3c/0x5c)
> [ 1.374244] [<c00609f0>] (handle_irq_event) from [<c0063698>]
> (handle_level_irq+0xc4/0x13c)
> [ 1.374256] [<c0063698>] (handle_level_irq) from [<c005ff7c>]
> (generic_handle_irq+0x2c/0x3c)
> [ 1.374269] [<c005ff7c>] (generic_handle_irq) from [<c02214ec>]
> (combiner_handle_cascade_irq+0x94/0x100)
> [ 1.374281] [<c02214ec>] (combiner_handle_cascade_irq) from
> [<c005ff7c>] (generic_handle_irq+0x2c/0x3c)
> [ 1.374290] [<c005ff7c>] (generic_handle_irq) from [<c0060248>]
> (__handle_domain_irq+0x7c/0xec)
> [ 1.374300] [<c0060248>] (__handle_domain_irq) from [<c0009434>]
> (gic_handle_irq+0x30/0x68)
>
>
> And below one page fault error when modetest is terminated,
>
> # modetest -M exynos -v -s 31@29:720x1280
> setting mode 720x1280-60Hz@XR24 on connectors 31, crtc 29
> freq: 59.99Hz
>
> [ 34.831025] PAGE FAULT occurred at 0x20400000 by 11e20000.sysmmu(Page
> table base: 0x6e324000)
> [ 34.838072] Lv1 entry: 0x6e92dc01
> [ 34.841489] ------------[ cut here ]------------
> [ 34.846058] kernel BUG at drivers/iommu/exynos-iommu.c:364!
> [ 34.851614] Internal error: Oops - BUG: 0 [#1] PREEMPT SMP ARM
> [ 34.857428] Modules linked in:
> [ 34.860472] CPU: 0 PID: 6 Comm: kworker/u8:0 Tainted: G W
> 4.1.0-rc4-00574-gf8eb363-dirty #1412
> [ 34.870188] Hardware name: SAMSUNG EXYNOS (Flattened Device Tree)
> [ 34.876273] Workqueue: events_unbound async_run_entry_fn
> [ 34.881560] task: ee879540 ti: ee8a2000 task.ti: ee8a2000
> [ 34.886946] PC is at exynos_sysmmu_irq+0x184/0x208
> [ 34.891716] LR is at exynos_sysmmu_irq+0xd4/0x208
> [ 34.896404] pc : [<c02880d0>] lr : [<c0288020>] psr: 60000193
> [ 34.896404] sp : ee8a3c00 ip : 00000000 fp : eeacbc10
> [ 34.907860] r10: c07c27ef r9 : 00000204 r8 : 20400000
> [ 34.913068] r7 : ee324000 r6 : ee9b3428 r5 : ee9b3410 r4 : 00000000
> [ 34.919577] r3 : 6e92dc01 r2 : 6e92dc01 r1 : eea55810 r0 : eeb0a000
> [ 34.926089] Flags: nZCv IRQs off FIQs on Mode SVC_32 ISA ARM
> Segment kernel
> [ 34.933466] Control: 10c5387d Table: 6dd2c04a DAC: 00000015
> [ 34.939195] Process kworker/u8:0 (pid: 6, stack limit = 0xee8a2210)
> [ 34.945444] Stack: (0xee8a3c00 to 0xee8a4000)
> [ 34.949788] 3c00: ee8a3c0c c0049df8 00000000 6e324000 0003d4f3
> ee9b13c0 ee84ad20 00000000
> [ 34.957947] 3c20: 00000000 00000026 ee84acc0 c00608f8 60000093
> eef84580 ee84acc0 ee84ad20
> [ 34.966106] 3c40: ee9b13c0 00000015 ee804450 ee8a3cd8 ee808000
> c00609f0 ee84acc0 ee84ad20
> [ 34.974265] 3c60: ee807000 c0063698 00000026 c079d6f8 ee807000
> c005ff7c 0000000a c02214ec
> [ 34.982424] 3c80: 00000015 00000000 00000015 00000000 00000001
> c005ff7c c0789aac c0060248
> [ 34.990583] 3ca0: f002000c 00000015 c078e7ac ee8a3cd8 f0020000
> ee8a2000 00000001 c0009434
> [ 34.998742] 3cc0: c052e8fc 60000013 ffffffff ee8a3d0c 00000004
> c0012ec0 eeacbd18 ee879540
> [ 35.006901] 3ce0: 00000000 00000271 eeacbd18 00000000 eea55010
> c078e100 00000004 ee8a2000
> [ 35.015061] 3d00: 00000001 eeacbc10 eeacbd88 ee8a3d20 c052e8f8
> c052e8fc 60000013 ffffffff
> [ 35.023220] 3d20: eeacbd18 c02dab48 20000113 00000003 60000013
> eeacbd18 00000004 eeacbc60
> [ 35.031379] 3d40: ffff30d5 eeacbca8 eeacbd18 00000004 60000013
> ffff30d5 c0802fe8 c02db05c
> [ 35.039538] 3d60: eeacbc60 00000002 c078e100 eeacbc60 ffff30d5
> c03b0f2c c078bb40 ee8a3e28
> [ 35.047697] 3d80: 00000001 ee8a3db8 eeacbc70 00000002 eeacbc70
> ee8a3db8 eeacbca8 c052e880
> [ 35.055857] 3da0: eeacbc70 c052d818 00000000 00000009 00000000
> c002791c ee8a3db8 11111111
> [ 35.064016] 3dc0: 11111111 ee8a3dc4 11111111 eeacbc60 00000002
> c078e100 ee8a3e28 ffff30d5
> [ 35.072175] 3de0: c0802fe8 00000001 ee80b400 c03ac4cc 00000000
> eeacbc60 ee8a3e28 00000002
> [ 35.080334] 3e00: eea47ac0 00000000 ee849d00 c03ac69c 00000000
> 00000001 00000001 eea47ac0
> [ 35.088493] 3e20: eea47ac0 c02e9f10 00000009 60000001 eea47ac0
> 00010009 00000001 eea47ac0
> [ 35.096653] 3e40: ee29149c 00000000 ee00c200 c02e5bdc 00000001
> c004425c ee00c200 00000047
> [ 35.104812] 3e60: ee00c200 ee00c200 ee8a3eb4 ee8a3eb4 00000000
> c02e5c5c ee00c200 ee00c200
> [ 35.112971] 3e80: 00000047 c02e564c ee00c200 00000047 ee8a3eb4
> ee80da00 00000000 c02e5704
> [ 35.121130] 3ea0: eeafd800 c07c5020 eeafd84c c025383c ee849d00
> c052d110 eeafd800 c0252a48
> [ 35.129289] 3ec0: ee914724 c07c5020 edcc9c40 c0252f58 edcc9c50
> c003ed48 eef84580 eea2f700
> [ 35.137448] 3ee0: ee849d00 edcc9c50 ee80b400 c0037944 ee8a2000
> ee80b400 00000001 ee80b400
> [ 35.145608] 3f00: ee849d18 ee80b420 ee8a2000 00000088 c07c27bc
> ee849d00 ee80b400 c0037ba0
> [ 35.153767] 3f20: c078e100 ee80b570 ee849d00 00000000 ee84b540
> ee849d00 c0037b54 00000000
> [ 35.161926] 3f40: 00000000 00000000 00000000 c003c8b8 ffffffff
> 00000000 ffffffff ee849d00
> [ 35.170085] 3f60: 00000000 00000000 dead4ead ffffffff ffffffff
> ee8a3f74 ee8a3f74 00000000
> [ 35.178245] 3f80: 00000000 dead4ead ffffffff ffffffff ee8a3f90
> ee8a3f90 ee8a3fac ee84b540
> [ 35.186403] 3fa0: c003c7dc 00000000 00000000 c000f5a0 00000000
> 00000000 00000000 00000000
> [ 35.194562] 3fc0: 00000000 00000000 00000000 00000000 00000000
> 00000000 00000000 00000000
> [ 35.202722] 3fe0: 00000000 00000000 00000000 00000000 00000013
> 00000000 ffffffff ffffffff
> [ 35.210894] [<c02880d0>] (exynos_sysmmu_irq) from [<c00608f8>]
> (handle_irq_event_percpu+0x78/0x134)
> [ 35.219914] [<c00608f8>] (handle_irq_event_percpu) from [<c00609f0>]
> (handle_irq_event+0x3c/0x5c)
> [ 35.228768] [<c00609f0>] (handle_irq_event) from [<c0063698>]
> (handle_level_irq+0xc4/0x13c)
> [ 35.237101] [<c0063698>] (handle_level_irq) from [<c005ff7c>]
> (generic_handle_irq+0x2c/0x3c)
> [ 35.245521] [<c005ff7c>] (generic_handle_irq) from [<c02214ec>]
> (combiner_handle_cascade_irq+0x94/0x100)
> [ 35.254980] [<c02214ec>] (combiner_handle_cascade_irq) from
> [<c005ff7c>] (generic_handle_irq+0x2c/0x3c)
> [ 35.264353] [<c005ff7c>] (generic_handle_irq) from [<c0060248>]
> (__handle_domain_irq+0x7c/0xec)
> [ 35.273034] [<c0060248>] (__handle_domain_irq) from [<c0009434>]
> (gic_handle_irq+0x30/0x68)
> [ 35.281366] [<c0009434>] (gic_handle_irq) from [<c0012ec0>]
> (__irq_svc+0x40/0x74)
>
> Could you check the iommu with atomic feature? I tested these features
> on trats2 board, and enabled one more crtc drivers - HDMI, VIDI, and FIMD.
>
> To other Exynos guys,
> could you guys check the same issues also? If you give some helps to us,
> we'd be glad.
I resolved above page fault issue with below patch:
[PATCH] drm/exynos: fimd: fix page fault issue with iommu
However, I still see above warning log. The problem is because
dev->num_crtcs is 0 when drm_handle_vblank function is called by fimd
irq handler.
So I added one line for num_crtcs to be updated at end of
exynos_drm_crtc_create function like below,
drm_dev->num_crtcs = drm_dev->mode_config.num_crtc;
However, with this, kernel booting is halted. See the below booting message,
[ 1.226408] [drm] Initialized drm 1.1.0 20060810
[ 1.235144] exynos-drm exynos-drm: bound exynos-drm-vidi (ops
vidi_component_ops)
[ 1.250154] BUG: spinlock bad magic on CPU#0, swapper/0/0
[ 1.254079] lock: 0xee188128, .magic: 00000000, .owner: <none>/-1,
.owner_cpu: 0
[ 1.261544] CPU: 0 PID: 0 Comm: swapper/0 Not tainted
4.1.0-rc4-00575-gfedbaf7-dirty #1433
[ 1.269783] Hardware name: SAMSUNG EXYNOS (Flattened Device Tree)
[ 1.275884] [<c0015464>] (unwind_backtrace) from [<c00123c0>]
(show_stack+0x10/0x14)
[ 1.283595] [<c00123c0>] (show_stack) from [<c0528f94>]
(dump_stack+0x84/0xc4)
[ 1.288136] exynos-sysmmu 11e20000.sysmmu: Disabled
[ 1.288161] exynos4-fb 11c00000.fimd: exynos_iommu_detach_device:
Detached IOMMU with pgtable 0x6ea50000
[ 1.288180] exynos-sysmmu 11e20000.sysmmu: Enabled
[ 1.288187] exynos4-fb 11c00000.fimd: exynos_iommu_attach_device:
Attached IOMMU with pgtable 0x6e3b4000
[ 1.288201] exynos-drm exynos-drm: bound 11c00000.fimd (ops
fimd_component_ops)
[ 1.288538] exynos-drm exynos-drm: bound 11c80000.dsi (ops
exynos_dsi_component_ops)
[ 1.288543] [drm] Supports vblank timestamp caching Rev 2 (21.10.2013).
[ 1.288547] [drm] No driver support for vblank timestamp query.
[ 1.288588] [drm] Initialized exynos 1.0.0 20110530 on minor 0
[ 1.289957] panel_s6e8aa0 11c80000.dsi.0: GPIO lookup for consumer reset
[ 1.289963] panel_s6e8aa0 11c80000.dsi.0: using device tree for GPIO
lookup
[ 1.290003] of_get_named_gpiod_flags: parsed 'reset-gpios' property
of node '/dsi@11C80000/panel@0[0]' - status (0)
We would need to resolve this issue somehow.
Thanks,
Inki Dae
>
> Thanks,
> Inki Dae
>
>>
>> v2:
>> - rebased onto latest exynos-drm-next branch with atomic mode setting
>> patches applied.
>>
>>
>> drivers/gpu/drm/exynos/exynos_drm_fimd.c | 130 +++++++++++++++++--------------
>> 1 file changed, 71 insertions(+), 59 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/exynos/exynos_drm_fimd.c b/drivers/gpu/drm/exynos/exynos_drm_fimd.c
>> index 96618534358e..f490895a8b02 100644
>> --- a/drivers/gpu/drm/exynos/exynos_drm_fimd.c
>> +++ b/drivers/gpu/drm/exynos/exynos_drm_fimd.c
>> @@ -196,6 +196,62 @@ static inline struct fimd_driver_data *drm_fimd_get_driver_data(
>> return (struct fimd_driver_data *)of_id->data;
>> }
>>
>> +static int fimd_enable_vblank(struct exynos_drm_crtc *crtc)
>> +{
>> + struct fimd_context *ctx = crtc->ctx;
>> + u32 val;
>> +
>> + if (ctx->suspended)
>> + return -EPERM;
>> +
>> + if (!test_and_set_bit(0, &ctx->irq_flags)) {
>> + val = readl(ctx->regs + VIDINTCON0);
>> +
>> + val |= VIDINTCON0_INT_ENABLE;
>> +
>> + if (ctx->i80_if) {
>> + val |= VIDINTCON0_INT_I80IFDONE;
>> + val |= VIDINTCON0_INT_SYSMAINCON;
>> + val &= ~VIDINTCON0_INT_SYSSUBCON;
>> + } else {
>> + val |= VIDINTCON0_INT_FRAME;
>> +
>> + val &= ~VIDINTCON0_FRAMESEL0_MASK;
>> + val |= VIDINTCON0_FRAMESEL0_VSYNC;
>> + val &= ~VIDINTCON0_FRAMESEL1_MASK;
>> + val |= VIDINTCON0_FRAMESEL1_NONE;
>> + }
>> +
>> + writel(val, ctx->regs + VIDINTCON0);
>> + }
>> +
>> + return 0;
>> +}
>> +
>> +static void fimd_disable_vblank(struct exynos_drm_crtc *crtc)
>> +{
>> + struct fimd_context *ctx = crtc->ctx;
>> + u32 val;
>> +
>> + if (ctx->suspended)
>> + return;
>> +
>> + if (test_and_clear_bit(0, &ctx->irq_flags)) {
>> + val = readl(ctx->regs + VIDINTCON0);
>> +
>> + val &= ~VIDINTCON0_INT_ENABLE;
>> +
>> + if (ctx->i80_if) {
>> + val &= ~VIDINTCON0_INT_I80IFDONE;
>> + val &= ~VIDINTCON0_INT_SYSMAINCON;
>> + val &= ~VIDINTCON0_INT_SYSSUBCON;
>> + } else
>> + val &= ~VIDINTCON0_INT_FRAME;
>> +
>> + writel(val, ctx->regs + VIDINTCON0);
>> + }
>> +}
>> +
>> static void fimd_wait_for_vblank(struct exynos_drm_crtc *crtc)
>> {
>> struct fimd_context *ctx = crtc->ctx;
>> @@ -248,6 +304,12 @@ static void fimd_clear_channel(struct fimd_context *ctx)
>>
>> DRM_DEBUG_KMS("%s\n", __FILE__);
>>
>> + /* Hardware is in unknown state, so ensure it gets enabled properly */
>> + pm_runtime_get_sync(ctx->dev);
>> +
>> + clk_prepare_enable(ctx->bus_clk);
>> + clk_prepare_enable(ctx->lcd_clk);
>> +
>> /* Check if any channel is enabled. */
>> for (win = 0; win < WINDOWS_NR; win++) {
>> u32 val = readl(ctx->regs + WINCON(win));
>> @@ -265,12 +327,17 @@ static void fimd_clear_channel(struct fimd_context *ctx)
>>
>> /* Wait for vsync, as disable channel takes effect at next vsync */
>> if (ch_enabled) {
>> - unsigned int state = ctx->suspended;
>> -
>> - ctx->suspended = 0;
>> + ctx->suspended = false;
>> + fimd_enable_vblank(ctx->crtc);
>> fimd_wait_for_vblank(ctx->crtc);
>> - ctx->suspended = state;
>> + fimd_disable_vblank(ctx->crtc);
>> + ctx->suspended = true;
>> }
>> +
>> + clk_disable_unprepare(ctx->lcd_clk);
>> + clk_disable_unprepare(ctx->bus_clk);
>> +
>> + pm_runtime_put(ctx->dev);
>> }
>>
>> static int fimd_iommu_attach_devices(struct fimd_context *ctx,
>> @@ -434,61 +501,6 @@ static void fimd_commit(struct exynos_drm_crtc *crtc)
>> writel(val, ctx->regs + VIDCON0);
>> }
>>
>> -static int fimd_enable_vblank(struct exynos_drm_crtc *crtc)
>> -{
>> - struct fimd_context *ctx = crtc->ctx;
>> - u32 val;
>> -
>> - if (ctx->suspended)
>> - return -EPERM;
>> -
>> - if (!test_and_set_bit(0, &ctx->irq_flags)) {
>> - val = readl(ctx->regs + VIDINTCON0);
>> -
>> - val |= VIDINTCON0_INT_ENABLE;
>> -
>> - if (ctx->i80_if) {
>> - val |= VIDINTCON0_INT_I80IFDONE;
>> - val |= VIDINTCON0_INT_SYSMAINCON;
>> - val &= ~VIDINTCON0_INT_SYSSUBCON;
>> - } else {
>> - val |= VIDINTCON0_INT_FRAME;
>> -
>> - val &= ~VIDINTCON0_FRAMESEL0_MASK;
>> - val |= VIDINTCON0_FRAMESEL0_VSYNC;
>> - val &= ~VIDINTCON0_FRAMESEL1_MASK;
>> - val |= VIDINTCON0_FRAMESEL1_NONE;
>> - }
>> -
>> - writel(val, ctx->regs + VIDINTCON0);
>> - }
>> -
>> - return 0;
>> -}
>> -
>> -static void fimd_disable_vblank(struct exynos_drm_crtc *crtc)
>> -{
>> - struct fimd_context *ctx = crtc->ctx;
>> - u32 val;
>> -
>> - if (ctx->suspended)
>> - return;
>> -
>> - if (test_and_clear_bit(0, &ctx->irq_flags)) {
>> - val = readl(ctx->regs + VIDINTCON0);
>> -
>> - val &= ~VIDINTCON0_INT_ENABLE;
>> -
>> - if (ctx->i80_if) {
>> - val &= ~VIDINTCON0_INT_I80IFDONE;
>> - val &= ~VIDINTCON0_INT_SYSMAINCON;
>> - val &= ~VIDINTCON0_INT_SYSSUBCON;
>> - } else
>> - val &= ~VIDINTCON0_INT_FRAME;
>> -
>> - writel(val, ctx->regs + VIDINTCON0);
>> - }
>> -}
>>
>> static void fimd_win_set_pixfmt(struct fimd_context *ctx, unsigned int win)
>> {
>>
>
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