packages/linux/omap3-pandora-kernel-wifi/evm-mcspi-ts.diff

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  49 From: Grazvydas Ignotas <notasas@gmail.com>
  50 To: linux-omap@vger.kernel.org
  51 Cc: Grazvydas Ignotas <notasas@gmail.com>
  52 Subject: Re: omap3evm LCD red-tint workaround
  53 Date:   Sun,  2 Nov 2008 21:56:19 +0200
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  67
  68 > PS: TS is still unusable with the 16x16 pixel resolution
  69 This is also the case for Pandora. The patch below fixes the problem,
  70 but as I have no other boards to test this on, I haven't sent it.
  71 See if it helps you.
  72
  73
  74 From 91f3af26bbf751b846e6265d86387e81be7c1364 Mon Sep 17 00:00:00 2001
  75 From: Grazvydas Ignotas <notasas@gmail.com>
  76 Date: Tue, 28 Oct 2008 22:01:42 +0200
  77 Subject: [PATCH] OMAP3: fix McSPI transfers
  78
  79 Currently on OMAP3 if both write and read is set up for a transfer,
  80 the first byte returned on read is corrupted. Work around this by
  81 disabling channel between reads and writes, instead of transfers.
  82 ---
  83  drivers/spi/omap2_mcspi.c |    7 ++++---
  84  1 files changed, 4 insertions(+), 3 deletions(-)
  85
  86 diff --git a/drivers/spi/omap2_mcspi.c b/drivers/spi/omap2_mcspi.c
  87 index 454a271..4890b6c 100644
  88 --- a/drivers/spi/omap2_mcspi.c
  89 +++ b/drivers/spi/omap2_mcspi.c
  90 @@ -710,7 +710,6 @@ static void omap2_mcspi_work(struct work_struct *work)
  91                 spi = m->spi;
  92                 cs = spi->controller_state;
  93
  94 -               omap2_mcspi_set_enable(spi, 1);
  95                 list_for_each_entry(t, &m->transfers, transfer_list) {
  96                         if (t->tx_buf == NULL && t->rx_buf == NULL && t->len) {
  97                                 status = -EINVAL;
  98 @@ -741,6 +740,8 @@ static void omap2_mcspi_work(struct work_struct *work)
  99                         if (t->len) {
 100                                 unsigned        count;
 101
 102 +                               omap2_mcspi_set_enable(spi, 1);
 103 +
 104                                 /* RX_ONLY mode needs dummy data in TX reg */
 105                                 if (t->tx_buf == NULL)
 106                                         __raw_writel(0, cs->base
 107 @@ -752,6 +753,8 @@ static void omap2_mcspi_work(struct work_struct *work)
 108                                         count = omap2_mcspi_txrx_pio(spi, t);
 109                                 m->actual_length += count;
 110
 111 +                               omap2_mcspi_set_enable(spi, 0);
 112 +
 113                                 if (count != t->len) {
 114                                         status = -EIO;
 115                                         break;
 116 @@ -777,8 +780,6 @@ static void omap2_mcspi_work(struct work_struct *work)
 117                 if (cs_active)
 118                         omap2_mcspi_force_cs(spi, 0);
 119
 120 -               omap2_mcspi_set_enable(spi, 0);
 121 -
 122                 m->status = status;
 123                 m->complete(m->context);
 124
 125 --
 126 1.5.4.3
 127
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