mmc: sdhci: Use "mmc" directly rather than "host->mmc"
Clean up the code to use the "mmc" directly instead of "host->mmc".
If the code sits in hot code path, this clean up also brings trvial
performance improvement. Take the sdhci_post_req() for example:
before the patch:
...
8d0:
a9be7bfd stp x29, x30, [sp, #-32]!
8d4:
910003fd mov x29, sp
8d8:
f9000bf3 str x19, [sp, #16]
8dc:
f9400833 ldr x19, [x1, #16]
8e0:
b9404261 ldr w1, [x19, #64]
8e4:
34000161 cbz w1, 910 <sdhci_post_req+0x50>
8e8:
f9424400 ldr x0, [x0, #1160]
8ec:
d2800004 mov x4, #0x0 // #0
8f0:
b9401a61 ldr w1, [x19, #24]
8f4:
b9403262 ldr w2, [x19, #48]
8f8:
f9400000 ldr x0, [x0]
8fc:
f278003f tst x1, #0x100
900:
f9401e61 ldr x1, [x19, #56]
904:
1a9f17e3 cset w3, eq // eq = none
908:
11000463 add w3, w3, #0x1
90c:
94000000 bl 0 <dma_unmap_sg_attrs>
...
After the patch:
...
8d0:
a9be7bfd stp x29, x30, [sp, #-32]!
8d4:
910003fd mov x29, sp
8d8:
f9000bf3 str x19, [sp, #16]
8dc:
f9400833 ldr x19, [x1, #16]
8e0:
b9404261 ldr w1, [x19, #64]
8e4:
34000141 cbz w1, 90c <sdhci_post_req+0x4c>
8e8:
b9401a61 ldr w1, [x19, #24]
8ec:
d2800004 mov x4, #0x0 // #0
8f0:
b9403262 ldr w2, [x19, #48]
8f4:
f9400000 ldr x0, [x0]
8f8:
f278003f tst x1, #0x100
8fc:
f9401e61 ldr x1, [x19, #56]
900:
1a9f17e3 cset w3, eq // eq = none
904:
11000463 add w3, w3, #0x1
908:
94000000 bl 0 <dma_unmap_sg_attrs>
...
We saved one ldr instruction: "ldr x0, [x0, #1160]"
Signed-off-by: Jisheng Zhang <Jisheng.Zhang@synaptics.com>
Acked-by: Adrian Hunter <adrian.hunter@intel.com>
Link: https://lore.kernel.org/r/20210311174046.597d1951@xhacker.debian
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>